CN115587505A

CN115587505A - Flow heat transfer model construction method and device based on dimensionless characteristic parameters

Info

Publication number: CN115587505A
Application number: CN202211569723.4A
Authority: CN
Inventors: 刘睿龙; 黄彦平; 臧金光; 刘光旭
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-01-10
Anticipated expiration: 2042-12-08
Also published as: CN115587505B

Abstract

The embodiment of the invention provides a method and a device for constructing a flow heat transfer model based on dimensionless characteristic parameters, wherein the method comprises the following steps: performing feature extraction according to a preset bending micro-channel structure to obtain dimensionless feature parameters of the bending micro-channel structure; obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method; and fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

Description

Flow heat transfer model construction method and device based on dimensionless characteristic parameters

Technical Field

The invention relates to the technical field of micro heat exchange channel structures, in particular to a flow heat transfer model construction method and device based on dimensionless characteristic parameters.

Background

In recent years, with the increase of the level of industrial manufacturing, compact heat exchangers based on printed circuit board heat exchangers are gradually being applied. The basic heat exchange unit of the printed circuit board type heat exchanger is a micro-channel structure, however, the widely used bent micro-channel structures are various in types and wide in optional parameter range at present, a new bent micro-channel structure can be generated by combination of each structural parameter, the known flow heat transfer characteristic of the micro-channel is not applicable, and the modeling speed of a flow heat transfer model established by an experimental measurement means is low, so that the design difficulty of the heat exchanger is high.

Disclosure of Invention

The invention aims to provide a flow heat transfer model construction method based on dimensionless characteristic parameters, which can improve the universality and the modeling speed of a flow heat transfer model, thereby simplifying the design difficulty of a heat exchanger. The invention further aims to provide a flow heat transfer model building device based on the dimensionless characteristic parameters. It is a further object of this invention to provide such a computer readable medium. It is a further object of the present invention to provide a computer apparatus.

In order to achieve the above object, the present invention discloses a method for constructing a flow heat transfer model based on dimensionless characteristic parameters, comprising:

performing feature extraction according to a preset bending micro-channel structure to obtain dimensionless feature parameters of the bending micro-channel structure;

obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method;

and fitting the constructed flowing heat transfer semi-empirical relation according to the flowing heat transfer parameters and the dimensionless characteristic parameters to obtain a flowing heat transfer model.

Preferably, the feature extraction is performed according to a preset bending type micro-channel structure, so as to obtain dimensionless feature parameters of the bending type micro-channel structure, and the method comprises the following steps:

performing characterization processing on the bent micro-channel structure to obtain a plurality of characteristic triangles of the bent micro-channel structure;

and generating dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters of the bent micro-channel structure and the characteristic triangles.

Preferably, the characteristic triangles comprise a channel characteristic triangle and a flow characteristic triangle, the structural parameters comprise the width, the deflection angle and the longitudinal pitch of the flow channel, and the dimensionless characteristic parameters comprise the characteristic parameters of the flow channel;

according to the structural parameters and the characteristic triangles of the bent micro-channel structure, dimensionless characteristic parameters of the bent micro-channel structure are generated, and the method comprises the following steps:

and according to the width, the deflection angle and the longitudinal pitch of the flow channel, calculating the similarity ratio of the channel characteristic triangle and the flow characteristic triangle to obtain the characteristic parameters of the flow channel.

Preferably, the characteristic triangles comprise rib wall characteristic triangles and flow characteristic triangles, the structural parameters comprise rib wall width, deflection angle and longitudinal pitch, and the dimensionless characteristic parameters comprise rib wall characteristic parameters;

and according to the width, the deflection angle and the longitudinal pitch of the rib wall, calculating the similarity ratio of the rib wall characteristic triangle and the flow characteristic triangle to obtain rib wall characteristic parameters.

Preferably, the characteristic triangles comprise fillet characteristic triangles and flow characteristic triangles, the structural parameters comprise fillet radius and longitudinal pitch, and the dimensionless characteristic parameters comprise fillet characteristic parameters;

and according to the radius of the fillet and the longitudinal pitch, performing similarity ratio calculation on the fillet characteristic triangle and the flow characteristic triangle to obtain fillet characteristic parameters.

Preferably, the structural parameter includes a deflection angle, and the dimensionless characteristic parameter includes a deflection characteristic parameter;

according to the structural parameter and a plurality of characteristic triangles of the class of bending microchannel structure, generating dimensionless characteristic parameters of the class of bending microchannel structure, including:

and determining the sine value of the deflection angle as a deflection characteristic parameter.

Preferably, the dimensionless characteristic parameters comprise flow channel characteristic parameters, rib wall characteristic parameters and fillet characteristic parameters, and the flow heat transfer semi-empirical relation comprises a continuous relation and a discontinuous relation;

fitting the constructed flowing heat transfer semi-empirical relation according to the flowing heat transfer parameters and the dimensionless characteristic parameters to obtain a flowing heat transfer model, wherein the fitting comprises the following steps:

if the type of the bent micro-channel structure is continuous, fitting and calculating a continuous relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters and the fillet characteristic parameters to obtain a constant coefficient of the continuous micro-channel;

obtaining a flow heat transfer model corresponding to the continuous bent micro-channel structure according to the constant coefficient of the continuous micro-channel and the continuous relational expression;

if the type of the bent micro-channel structure is discontinuous, fitting and calculating a discontinuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter to obtain a discontinuous micro-channel constant coefficient;

and obtaining a flow heat transfer model corresponding to the discontinuous bending micro-channel structure according to the constant coefficient of the discontinuous micro-channel and the discontinuous relational expression.

Preferably, the flow heat transfer parameters include convective heat transfer characteristics, flow resistance characteristics, reynolds number and prandtl number;

before fitting and calculating the continuous relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters and the fillet characteristic parameters to obtain the constant coefficients of the continuous micro-channel, the method further comprises the following steps:

and establishing a functional relation between the convective heat transfer characteristic and the Reynolds number, the Plantt number, the flow channel characteristic parameter and the fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a continuous relational expression.

before fitting and calculating the discontinuous relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters, the rib wall characteristic parameters and the fillet characteristic parameters to obtain the constant coefficient of the discontinuous micro-channel, the method further comprises the following steps:

and establishing a functional relation between the convection heat exchange characteristic and the Reynolds number, the Plantt number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a discontinuous relation.

Preferably, after the constructed flow heat transfer semi-empirical relation is fitted according to the flow heat transfer parameter and the dimensionless characteristic parameter to obtain the flow heat transfer model, the method further includes:

obtaining a target Reynolds number and a target Plantt number;

and generating a target convection heat exchange characteristic and a target flow resistance characteristic according to the target Reynolds number and the target Plantt number through a flow heat transfer model.

The invention also discloses a flow heat transfer model construction device based on the dimensionless characteristic parameters, which comprises the following steps:

the characteristic extraction unit is used for extracting characteristics according to a preset bending micro-channel structure to obtain dimensionless characteristic parameters of the bending micro-channel structure;

the numerical simulation unit is used for obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method;

and the fitting unit is used for fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

Preferably, the feature extraction unit is specifically configured to perform characterization processing on the bent micro-channel structure to obtain a plurality of feature triangles of the bent micro-channel structure; and generating dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters of the bent micro-channel structure and the characteristic triangles.

Preferably, the characteristic triangles comprise a channel characteristic triangle and a flow characteristic triangle, the structural parameters comprise the width of the flow channel, the deflection angle and the longitudinal pitch, and the dimensionless characteristic parameters comprise the characteristic parameters of the flow channel;

and the characteristic extraction unit is specifically used for calculating the similarity ratio of the channel characteristic triangle and the flow characteristic triangle according to the width, the deflection angle and the longitudinal pitch of the flow channel to obtain flow channel characteristic parameters.

and the feature extraction unit is specifically used for calculating the similarity ratio of the rib wall feature triangle and the flow feature triangle according to the rib wall width, the deflection angle and the longitudinal pitch to obtain rib wall feature parameters.

Preferably, the characteristic triangles comprise a fillet characteristic triangle and a flow characteristic triangle, the structural parameters comprise a fillet radius and a longitudinal pitch, and the dimensionless characteristic parameters comprise fillet characteristic parameters;

and the characteristic extraction unit is specifically used for calculating the similarity ratio of the fillet characteristic triangle and the flow characteristic triangle according to the radius of the fillet and the longitudinal pitch to obtain fillet characteristic parameters.

and the characteristic extraction unit is specifically used for determining the sine value of the deflection angle as a deflection characteristic parameter.

the fitting unit is specifically used for performing fitting calculation on the continuous type relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters and the fillet characteristic parameters to obtain the constant coefficient of the continuous type microchannel if the type of the bent type microchannel structure is continuous; obtaining a flow heat transfer model corresponding to the continuous type bent micro-channel structure according to the constant coefficient of the continuous type micro-channel and the continuous type relational expression; if the type of the bent micro-channel structure is discontinuous, fitting and calculating a discontinuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter to obtain a discontinuous micro-channel constant coefficient; and obtaining a flow heat transfer model corresponding to the discontinuous bending micro-channel structure according to the constant coefficient of the discontinuous micro-channel and the discontinuous relational expression.

Preferably, the flow heat transfer parameters include convective heat transfer characteristics, flow resistance characteristics, reynolds number and prandtl number; the device still includes:

the first construction unit is used for establishing a functional relation between the convective heat transfer characteristic and the Reynolds number, the Prandtl number, the flow channel characteristic parameter and the fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a continuous relational expression.

and the second construction unit is used for establishing a functional relation between the convective heat transfer characteristic and the Reynolds number, the Prandtl number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a discontinuous relational expression.

Preferably, the apparatus further comprises:

the acquisition unit is used for acquiring a target Reynolds number and a target Prandtl number;

and the generating unit is used for generating a target convection heat exchange characteristic and a target flow resistance characteristic according to the target Reynolds number and the target Plantt number through the flow heat transfer model.

The invention also discloses a computer-readable medium, on which a computer program is stored which, when executed by a processor, implements a method as described above.

The invention also discloses a computer device comprising a memory for storing information comprising program instructions and a processor for controlling the execution of the program instructions, the processor implementing the method as described above when executing the program.

The invention also discloses a computer program product comprising computer programs/instructions which, when executed by a processor, implement the method as described above.

According to the invention, feature extraction is carried out according to a preset bending micro-channel structure to obtain dimensionless feature parameters of the bending micro-channel structure; obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method; and fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a flow heat transfer model construction method based on dimensionless characteristic parameters according to an embodiment of the present invention;

FIG. 2 is a flow chart of a flow heat transfer model building method based on dimensionless characteristic parameters according to another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a basic structure of a bending micro-channel according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a deformed structure of a bending micro-channel according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a deformed structure of a bending micro-channel according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a deformed structure of a bending micro-channel according to an embodiment of the present invention;

FIG. 7 is a schematic view of a characteristic triangle of a right-angled continuous microchannel according to an embodiment of the present invention;

FIG. 8 is a schematic view of a characteristic triangle of a round continuous micro-channel provided in accordance with an embodiment of the present invention;

FIG. 9 is a schematic view of a characteristic triangle of a round corner discontinuous micro-channel according to an embodiment of the present invention;

FIG. 10 is a schematic view of a triangle of a right-angle discontinuous microchannel according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a flow heat transfer model building device based on dimensionless characteristic parameters according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a computer device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In order to facilitate understanding of the technical solutions provided in the present application, the following first describes relevant contents of the technical solutions in the present application. The heat exchanger is general process equipment for allocating energy among different logistics and completing heat transportation, is widely applied to a large number of industries such as power generation, chemical engineering, power, metallurgy and the like, and particularly plays an important role in transferring and allocating energy among working media in a power circulation system taking supercritical carbon dioxide as the working media. With the continuous improvement of the technological level, the importance of special application scenes of power systems related to nuclear power stations, thermal power stations and aircraft engines is higher and higher, and the reduction of the size of equipment, the improvement of efficiency and the reduction of the manufacturing and operating cost and the consumption of natural resources of the equipment are one of the directions of future development of heat exchangers. The heat exchangers currently used in the conventional industrial field mainly include shell-and-tube heat exchangers, double-tube heat exchangers, plate-fin heat exchangers and the like, which cannot simultaneously meet the requirements of large heat exchange specific surface area, high welding strength and small volume. In recent years, with the improvement of the industrial manufacturing level, the compact heat exchanger mainly based on the printed circuit board type heat exchanger gradually moves to the application stage, the micro-channel has small size and high compactness, the strength of the welding joint is close to that of the base material, and the micro-channel has obvious advantages. The basic heat exchange unit of the printed circuit board type heat exchanger is a micro-channel structure, however, the widely used bending micro-channel structures are various in types and wide in optional parameter range at present, a new bending micro-channel structure can be generated by the combination of each structural parameter, the flow heat transfer characteristic of the known micro-channel is not applicable, and a lot of difficulties are increased for the design of the heat exchanger. In view of the above, the invention provides a flow heat transfer model construction method based on dimensionless characteristic parameters, aiming at the characteristics of multiple types, complex structure and variable flow heat transfer characteristics of the bent micro-channel, and the design available range is improved. The method has the advantages that the geometric structure of the micro-channel is characterized, converted into a plurality of characteristic triangles and subjected to dimensionless characteristic parameters, so that a solution is provided for large-scale establishment of a bent micro-channel flow heat transfer model and a database, the design efficiency of the heat exchanger is improved, the universality of model establishment and the modeling speed are improved, the design boundary of the bent micro-channel is greatly widened, the method can be widely applied to the design and use environments of the micro-channel compact heat exchanger, and the market application prospect is wide.

The following describes an implementation process of the flow heat transfer model construction method based on the dimensionless characteristic parameters, which is provided by the embodiment of the present invention, by taking the flow heat transfer model construction device based on the dimensionless characteristic parameters as an example. It can be understood that the implementation subject of the flow heat transfer model construction method based on the dimensionless characteristic parameter provided by the embodiment of the invention includes, but is not limited to, the flow heat transfer model construction device based on the dimensionless characteristic parameter.

Fig. 1 is a flowchart of a method for constructing a flow heat transfer model based on dimensionless characteristic parameters according to an embodiment of the present invention, as shown in fig. 1, the method includes:

101, extracting characteristics according to a preset bending micro-channel structure to obtain dimensionless characteristic parameters of the bending micro-channel structure.

102, obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method.

And 103, fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

It should be noted that the technical solutions in the present application, such as obtaining, storing, using, and processing data, all conform to relevant regulations of national laws and regulations. The user information in the embodiment of the application is obtained through legal compliance, and the user information is obtained, stored, used, processed and the like through authorization approval of a client.

In the technical scheme provided by the embodiment of the invention, the characteristic extraction is carried out according to the preset bending micro-channel structure to obtain the dimensionless characteristic parameters of the bending micro-channel structure; obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method; according to the flow heat transfer parameters and the dimensionless characteristic parameters, the constructed flow heat transfer semi-empirical relation is fitted to obtain a flow heat transfer model.

Fig. 2 is a flowchart of a method for constructing a flow heat transfer model based on dimensionless characteristic parameters according to another embodiment of the present invention, as shown in fig. 2, the method includes:

step 201, performing characterization processing on the bent micro-channel structure to obtain a plurality of characteristic triangles of the bent micro-channel structure.

In the embodiment of the invention, each step is executed by the flow heat transfer model building device based on the dimensionless characteristic parameter.

Fig. 3 is a schematic structural diagram of a basic structure of a bending-type microchannel provided in an embodiment of the present invention, as shown in fig. 3, a working medium moves in a zigzag manner along a direction of a broken line, a plurality of microchannels perpendicular to a flow direction are parallel to each other, rib walls are arranged between the microchannels, and the rib walls are shown by continuous oblique lines in fig. 3The shape of the microchannel is semicircular when viewed in a flow cross section. As shown in FIG. 3, the bent micro-channel is a right-angled continuous micro-channel, and the structural parameters of the right-angled continuous micro-channel include, but are not limited to, the width D of the flow channel _h Rib width d, longitudinal pitch l _p A deflection angle alpha and a fillet radius r.

It should be noted that the flow cross-sectional shape of the microchannel is not limited to a semicircular shape, and may also be a geometric shape such as a rectangle or a trapezoid, which is not limited in the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a deformed structure of a meandering microchannel according to an embodiment of the present invention, as shown in fig. 4, the meandering microchannel is a round-corner continuous microchannel, and structural parameters of the round-corner continuous microchannel include, but are not limited to, a channel width D _h Rib wall width d, longitudinal pitch l _p A deflection angle alpha and a fillet radius r.

Fig. 5 is a schematic structural diagram of a deformed structure of a meandering microchannel according to an embodiment of the present invention, as shown in fig. 5, the meandering microchannel is a round-corner discontinuous microchannel, and structural parameters of the round-corner discontinuous microchannel include, but are not limited to, a channel width D _h Rib width d, longitudinal pitch l _p A deflection angle alpha and a fillet radius r.

Fig. 6 is a schematic structural diagram of a deformed structure of a bent micro-channel according to an embodiment of the present invention, as shown in fig. 6, the bent micro-channel is a right-angle discontinuous micro-channel, and structural parameters of the right-angle discontinuous micro-channel include, but are not limited to, a channel width D _h Rib wall width d, longitudinal pitch l _p And a deflection angle alpha.

In the embodiment of the invention, the corresponding micro-channel type can be selected according to the structure of the bent micro-channel to be researched. And (4) aiming at each micro-channel type, inducing the bent micro-channels to obtain a plurality of characteristic triangles.

FIG. 7 is a schematic diagram of a triangle feature of a right-angled continuous microchannel according to an embodiment of the present invention, as shown in FIG. 7, the triangle feature includes a channel feature triangle (Δ 1), a flow feature triangle (Δ 2), and a rib feature triangle (Δ 3), the channel feature is characterized byThe triangle (delta 1), the flow characteristic triangle (delta 2) and the rib wall characteristic triangle (delta 3) are similar triangles, and included angles between the inclined edge and the long right-angle edge are deflection angles alpha. According to the width D of the flow channel _h Rib wall width d, longitudinal pitch l _p And the deflection angle alpha, the length of the oblique side of the channel characteristic triangle (delta 1) can be determined as D _h Sin2 α, long right-angle side length of flow characteristic triangle (Δ 2) is l _p And 2, the length of the oblique side of the rib wall characteristic triangle (delta 3) is d/sin2 alpha.

Fig. 8 is a schematic diagram of a characteristic triangle of a rounded continuous microchannel according to an embodiment of the present invention, where as shown in fig. 8, the characteristic triangle includes a channel characteristic triangle (Δ 1), a flow characteristic triangle (Δ 2), a rib wall characteristic triangle (Δ 3), and a rounded corner characteristic triangle (Δ 4), and the channel characteristic triangle (Δ 1), the flow characteristic triangle (Δ 2), the rib wall characteristic triangle (Δ 3), and the rounded corner characteristic triangle (Δ 4) are triangles similar to each other. According to the width D of the flow channel _h Rib wall width d, longitudinal pitch l _p And the deflection angle alpha can determine that the length of the diagonal side of the channel characteristic triangle (delta 1) is D _h Sin2 α, long right-angle side length of flow characteristic triangle (Δ 2) is l _p And 2, the side length of the inclined angle of the rib wall characteristic triangle (delta 3) is d/sin2 alpha, and the side length of the long right angle of the fillet characteristic triangle (delta 4) is r.

Fig. 9 is a schematic diagram of a characteristic triangle of a round-corner discontinuous micro-channel according to an embodiment of the present invention, as shown in fig. 9, the characteristic triangle includes a channel characteristic triangle (Δ 1), a flow characteristic triangle (Δ 2), a rib wall characteristic triangle (Δ 3), and a round-corner characteristic triangle (Δ 4), and the channel characteristic triangle (Δ 1), the flow characteristic triangle (Δ 2), the rib wall characteristic triangle (Δ 3), and the round-corner characteristic triangle (Δ 4) are triangles similar to each other. According to the width D of the flow channel _h Rib width d, longitudinal pitch l _p And the deflection angle alpha, the length of the oblique side of the channel characteristic triangle (delta 1) can be determined as D _h Sin2 α, long right-angle side length of flow characteristic triangle (Δ 2) is l _p /2, length of hypotenuse of characteristic triangle of ribbed wall (. DELTA.3)Is d/sin2 alpha, and the long right-angle side length of the fillet characteristic triangle (delta 4) is r.

Fig. 10 is a schematic diagram of a characteristic triangle of a right-angle discontinuous microchannel provided in an embodiment of the present invention, and as shown in fig. 10, the characteristic triangle includes a channel characteristic triangle (Δ 1), a flow characteristic triangle (Δ 2), and a rib wall characteristic triangle (Δ 3), and the channel characteristic triangle (Δ 1), the flow characteristic triangle (Δ 2), and the rib wall characteristic triangle (Δ 3) are triangles similar to each other. According to the width D of the flow channel _h Rib wall width d, longitudinal pitch l _p And the deflection angle alpha, the length of the oblique side of the channel characteristic triangle (delta 1) can be determined as D _h Sin2 α, long right-angle side length of flow characteristic triangle (Δ 2) is l _p And 2, the length of the inclined side of the rib wall characteristic triangle (delta 3) is d/sin2 alpha.

Step 202, generating dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters of the bent micro-channel structure and the plurality of characteristic triangles.

In the embodiment of the invention, because the channel characteristic triangle (delta 1), the flow characteristic triangle (delta 2), the rib wall characteristic triangle (delta 3) and the fillet characteristic triangle (delta 4) are similar triangles, the similarity ratio can be calculated according to the known side length and the deflection angle to obtain each side length of each characteristic triangle.

In the embodiment of the invention, the dimensionless characteristic parameters comprise a flow channel characteristic parameter, a rib wall characteristic parameter, a fillet characteristic parameter and a deflection characteristic parameter. The flow channel characteristic parameters are used for measuring the relative size of a flow channel structure of the bent micro-channel, the rib wall characteristic parameters are used for measuring the relative size of a rib wall structure of the bent micro-channel, the fillet characteristic parameters are used for measuring the relative size of a fillet structure of the bent micro-channel, and the deflection characteristic parameters are used for measuring the relative size of a deflection structure of the bent micro-channel.

In the embodiment of the invention, the similarity ratio calculation can be carried out on the channel characteristic triangle (delta 1) and the flow characteristic triangle (delta 2) according to the width, the deflection angle and the longitudinal pitch of the flow channel

And obtaining the characteristic parameters of the flow channel. Specifically, the characteristic triangles include a channel characteristic triangle (delta 1) and a flow characteristic triangle (delta 2), and the structural parameters include a flow channel width D _h Angle of deflection alpha and longitudinal pitch l _p . By passing

And calculating the width, the deflection angle and the longitudinal pitch of the flow channel to obtain characteristic parameters of the flow channel. Wherein,

as a characteristic parameter of the flow channel, D _h Is the width of the flow channel, alpha is the deflection angle, l _p Is the longitudinal pitch.

In the embodiment of the invention, similarity ratio calculation can be carried out on the rib characteristic triangle (delta 3) and the flow characteristic triangle (delta 2) according to the width, the deflection angle and the longitudinal pitch of the rib wall

And obtaining the rib wall characteristic parameters. Specifically, the characteristic triangles include a rib wall characteristic triangle (delta 3) and a flow characteristic triangle (delta 2), and the structural parameters include rib wall width d, deflection angle alpha and longitudinal pitch l _p . By passing

And calculating the width, the deflection angle and the longitudinal pitch of the rib wall to obtain the characteristic parameters of the rib wall. Wherein,

is a rib wall characteristic parameter, d is a rib wall width, alpha is a deflection angle, l _p Is the longitudinal pitch.

In the embodiment of the invention, the similarity ratio calculation can be carried out on the fillet characteristic triangle (delta 4) and the flow characteristic triangle (delta 2) according to the fillet radius and the longitudinal pitch

And obtaining fillet characteristic parameters. Specifically, the characteristic triangles comprise a fillet characteristic triangle (delta 4) and a flow characteristic triangle (delta 2), and the structural parameters comprise a fillet radius r and a longitudinal pitch l _p . By passing

And calculating the radius of the fillet and the longitudinal pitch to obtain fillet characteristic parameters. Wherein,

is a characteristic parameter of a fillet, r is a fillet radius, l _p Is the longitudinal pitch.

In the embodiment of the invention, for each kind of characteristic triangle, the structural parameters include the deflection angle. Specifically, the sine value of the deflection angle is determined as a deflection characteristic parameter

。

It should be noted that the established dimensionless characteristic triangle parameter is not limited to the flow characteristic triangle (Δ 2) as a similar triangle, and four characteristic triangles may be arbitrarily used to construct the dimensionless parameter.

And 203, obtaining the flowing heat transfer parameters according to the bent micro-channel structure by a numerical simulation method.

As an alternative scheme, a grid model is established according to a bent micro-channel structure to be researched, numerical simulation calculation is carried out on temperature, pressure and flow thermodynamic and hydraulic parameters within a certain working range through FLUENT numerical simulation calculation, and flowing heat transfer parameters of the structure are obtained. The flow heat transfer parameters include but not limited to, convective heat transfer characteristics (Nu) Flow resistance characteristics (f) Reynolds number (a)Re) And prandtl number (Pr）。

It should be noted that the numerical simulation method is a relatively mature calculation method in the industry, and the embodiment of the present invention is not described in detail herein.

And step 204, fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

<xnotran> , (</xnotran>Nu) Flow resistance characteristics (f) Reynolds number (a)Re) And prandtl number (Pr). Establishing the convective heat transfer characteristics by an elementary function (Nu) And Reynolds number (Re) And prandtl number (Pr) Functional relationship between them, and flow resistance characteristics (C:)f) And Reynolds number (Re) And obtaining a flow heat transfer semi-empirical relation.

As an alternative, the elementary function is a power function, and the underlying flow heat transfer semi-empirical relationship is obtained as follows:

wherein,Nuin order to achieve the convection heat exchange characteristic,fin order to be a flow resistance characteristic,Rein order to obtain the Reynolds number,Pris a prandtl number, n ₀ 、n ₁ 、n ₂ 、m ₀ And m ₁ All are constant coefficients.

It should be noted that the elementary function is not limited to the power function, and may also be other simple mathematical relations such as an exponential function, which is not limited in the embodiment of the present invention.

Further, dimensionless characteristic parameters are introduced into the basic flow heat transfer semi-empirical relation, and the dimensionless characteristic parameters comprise a flow channel characteristic parameter, a rib wall characteristic parameter and a fillet characteristic parameter.

In the embodiment of the invention, the types of the bent micro-channel structures comprise a continuous type and an intermittent type, correspondingly, the flowing heat transfer semi-empirical relation comprises a continuous type relation and an intermittent type relation, the continuous type relation is the flowing heat transfer semi-empirical relation corresponding to the continuous bent micro-channel, and the intermittent type relation is the flowing heat transfer semi-empirical relation corresponding to the intermittent bent micro-channel.

Wherein, for the continuous relational expression, the method comprisesEqual function to establish convective heat transfer characteristics (Nu) And Reynolds number (Re) Prandtl number (Pr) Characteristic parameters of the flow channel

And fillet characteristic parameters

Functional relationship between them, and flow resistance characteristics (C:)f) And Reynolds number (Re) Characteristic parameters of the flow channel

And fillet characteristic parameters

The function relationship between the two is used to obtain a continuous relation.

As an alternative, the elementary function is a power function, and then the continuous relation is obtained as follows:

wherein,Nuin order to have the characteristic of heat convection,fin order to be a flow resistance characteristic,Rein order to obtain the Reynolds number,Pris the number of the prandtl number,

is a characteristic parameter of the flow passage,

is a characteristic parameter of the fillet, n ₀ ……n ₄ 、m ₀ ……m ₃ All are constant coefficients.

Wherein, for the discontinuous relation, establishing the convective heat transfer characteristic (through an elementary function)Nu) And Reynolds number (Re) Prandtl number (Pr) Characteristic parameters of the flow channel

Rib wall characteristic parameters

And fillet characteristic parameters

Characteristic parameters of ribbed wall

And fillet characteristic parameters

Obtaining a discontinuous relation expression through the functional relation between the two.

As an alternative, the elementary function is a power function, and then the discontinuous relation is obtained as follows:

wherein,Nuin order to have the characteristic of heat convection,fin order to have a flow resistance characteristic,Rein order to obtain the Reynolds number,Pris the number of the prandtl number,

is a characteristic parameter of the flow passage,

is a characteristic parameter of the round angle,

as a characteristic parameter of the rib wall, n ₀ ……n ₅ 、m ₀ ……m ₄ All are constant coefficients.

In particular, if the micro-channel structure is bentThe type (2) is a continuous type, fitting calculation is carried out on a continuous type relational expression according to flow heat transfer parameters, flow channel characteristic parameters and fillet characteristic parameters to obtain a constant coefficient n of a continuous type micro-channel ₀ ……n ₄ 、m ₀ ……m ₃ (ii) a And obtaining a flow heat transfer model corresponding to the continuous bent micro-channel structure according to the constant coefficient of the continuous micro-channel and the continuous relational expression. Specifically, the constant coefficient n of the continuous micro-channel is set ₀ ……n ₄ 、m ₀ ……m ₃ And replacing the continuous relational expression to obtain a flow heat transfer model corresponding to the continuous bent micro-channel structure.

Specifically, if the type of the bent micro-channel structure is discontinuous, fitting calculation is performed on a discontinuous relational expression according to flow heat transfer parameters, flow channel characteristic parameters, rib wall characteristic parameters and fillet characteristic parameters to obtain a constant coefficient n of the discontinuous micro-channel ₀ ……n ₅ 、m ₀ ……m ₄ (ii) a And obtaining a flow heat transfer model corresponding to the discontinuous bending micro-channel structure according to the constant coefficient of the discontinuous micro-channel and the discontinuous relational expression. Specifically, the constant coefficient n of the discontinuous micro-channel is set ₀ ……n ₅ 、m ₀ ……m ₄ And replacing the discontinuous relational expression to obtain a flow heat transfer model corresponding to the discontinuous bending micro-channel structure.

In the embodiment of the invention, the flow heat transfer model can be suitable for bent micro-channels with other structures in the design process, and only dimensionless parameters of the micro-channel to be researched need to be calculated. The design can be guided by a flow heat transfer model, namely: the values of the convective heat transfer characteristics (Nu) and the flow resistance characteristics (f) under the conditions of arbitrary reynolds numbers (Re) and prandtl numbers (Pr) were calculated.

It is worth to be noted that the construction method of the flow heat transfer model based on the dimensionless characteristic parameters provided by the application is irrelevant to the structural parameters and structural types of the bent micro-channel, the thermal parameters and types of the operating working medium, the processing technology (including chemical etching technology and mechanical cutting technology) of the bent micro-channel and the section shape of the bent micro-channel.

And step 205, acquiring a target Reynolds number and a target Plantl number.

In the embodiment of the invention, the target Reynolds number and the target Plantl number can be set by a user at will according to requirements.

And step 206, generating a target convective heat exchange characteristic and a target flow resistance characteristic according to the target Reynolds number and the target Plantt number through a flow heat transfer model.

Specifically, a target Reynolds number and a target Prandtl number are input into the flow heat transfer model, and corresponding target convective heat transfer characteristics and target flow resistance characteristics are output.

In the embodiment of the invention, the simple mathematical relation among the flow heat transfer parameters, the dimensionless length and the dimensionless deflection angle is obtained by characterizing the structure of the bent micro-channel and introducing the dimensionless length and the dimensionless deflection angle, and the analytic form of the working medium flow heat transfer model in the bent micro-channel is established. The flow heat transfer model is a simple mathematical relation which is irrelevant to the temperature, the pressure, the supercritical fluid type and the specific size of the bent micro-channel, breaks through the obstacles brought to the modeling of the flow heat transfer characteristic of the bent micro-channel by various structural sizes and working media with different physical properties, establishes a method for conveniently designing the micro-channel compact heat exchanger, provides theoretical support for optimizing the flow heat transfer characteristic of the micro-channel compact heat exchanger, improves the universality of the established model and the modeling speed, greatly widens the design boundary of the bent micro-channel, can be widely applied to the design and use environment of the micro-channel compact heat exchanger, and has wide market application prospect.

In the technical scheme of the flow heat transfer model construction method based on the dimensionless characteristic parameters, the characteristic extraction is carried out according to the preset bending micro-channel structure to obtain the dimensionless characteristic parameters of the bending micro-channel structure; obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method; according to the flowing heat transfer parameters and the dimensionless characteristic parameters, fitting is carried out on the constructed flowing heat transfer semi-empirical relation to obtain a flowing heat transfer model.

Fig. 11 is a schematic structural diagram of a flow heat transfer model building apparatus based on non-dimensional characteristic parameters, which is provided in an embodiment of the present invention, and is used for executing the flow heat transfer model building method based on non-dimensional characteristic parameters, as shown in fig. 11, the apparatus includes: a feature extraction unit 11, a numerical simulation unit 12 and a fitting unit 13.

The feature extraction unit 11 is configured to perform feature extraction according to a preset bending micro-channel structure to obtain a dimensionless feature parameter of the bending micro-channel structure.

The numerical simulation unit 12 is used for obtaining the flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method.

The fitting unit 13 is configured to fit the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameter and the dimensionless characteristic parameter, so as to obtain a flow heat transfer model.

In the embodiment of the present invention, the feature extraction unit 11 is specifically configured to perform a characterization process on the bent micro-channel structure to obtain a plurality of feature triangles of the bent micro-channel structure; and generating dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters of the bent micro-channel structure and the characteristic triangles.

In the embodiment of the invention, the characteristic triangles comprise a channel characteristic triangle and a flow characteristic triangle, the structural parameters comprise the width of a flow channel, a deflection angle and a longitudinal pitch, and the dimensionless characteristic parameters comprise the characteristic parameters of the flow channel; the feature extraction unit 11 is specifically configured to perform similarity ratio calculation on the channel feature triangle and the flow feature triangle according to the width, the deflection angle, and the longitudinal pitch of the flow channel to obtain a flow channel feature parameter.

In the embodiment of the invention, the characteristic triangles comprise rib wall characteristic triangles and flow characteristic triangles, the structural parameters comprise rib wall width, deflection angle and longitudinal pitch, and the dimensionless characteristic parameters comprise rib wall characteristic parameters; the feature extraction unit 11 is specifically configured to perform similarity ratio calculation on the rib feature triangle and the flow feature triangle according to the width, the deflection angle, and the longitudinal pitch of the rib, so as to obtain a rib feature parameter.

In the embodiment of the invention, the characteristic triangles comprise a fillet characteristic triangle and a flow characteristic triangle, the structural parameters comprise fillet radius and longitudinal pitch, and the dimensionless characteristic parameters comprise fillet characteristic parameters; the feature extraction unit 11 is specifically configured to perform similarity ratio calculation on the fillet feature triangle and the flow feature triangle according to the fillet radius and the longitudinal pitch, so as to obtain fillet feature parameters.

In the embodiment of the invention, the structural parameters comprise deflection angles, and the dimensionless characteristic parameters comprise deflection characteristic parameters; the feature extraction unit 11 is specifically configured to determine a sine value of the deflection angle as a deflection feature parameter.

In the embodiment of the invention, the dimensionless characteristic parameters comprise flow channel characteristic parameters, rib wall characteristic parameters and fillet characteristic parameters, and the flowing heat transfer semi-empirical relation comprises a continuous relation and an intermittent relation; the fitting unit 13 is specifically configured to, if the type of the bent micro-channel structure is a continuous type, perform fitting calculation on a continuous type relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, and the fillet characteristic parameter to obtain a constant coefficient of the continuous micro-channel; obtaining a flow heat transfer model corresponding to the continuous type bent micro-channel structure according to the constant coefficient of the continuous type micro-channel and the continuous type relational expression; if the type of the bent micro-channel structure is discontinuous, fitting and calculating a discontinuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter to obtain a discontinuous micro-channel constant coefficient; and obtaining a flow heat transfer model corresponding to the discontinuous bending micro-channel structure according to the constant coefficient of the discontinuous micro-channel and the discontinuous relational expression.

In the embodiment of the invention, the flow heat transfer parameters comprise convective heat transfer characteristics, flow resistance characteristics, reynolds number and Plantt number; the device still includes: a first building element 14.

The first constructing unit 14 is configured to establish a functional relationship between the convective heat transfer characteristic and the reynolds number, the prandtl number, the flow channel characteristic parameter and the fillet characteristic parameter, and a functional relationship between the flow resistance characteristic and the reynolds number, the flow channel characteristic parameter and the fillet characteristic parameter through an elementary function, so as to obtain a continuous relational expression.

In the embodiment of the invention, the flow heat transfer parameters comprise a convection heat exchange characteristic, a flow resistance characteristic, a Reynolds number and a Prandtl number; the device still includes: a second building element 15.

The second construction unit 15 is configured to establish a functional relationship between the convective heat transfer characteristic and the reynolds number, the prandtl number, the flow channel characteristic parameter, the rib wall characteristic parameter, and the fillet characteristic parameter, and a functional relationship between the flow resistance characteristic and the reynolds number, the flow channel characteristic parameter, the rib wall characteristic parameter, and the fillet characteristic parameter through an elementary function, so as to obtain a discontinuous relational expression.

In an embodiment of the present invention, the apparatus further includes: an acquisition unit 16 and a generation unit 17.

The obtaining unit 16 is used for obtaining a target reynolds number and a target prandtl number.

The generating unit 17 is configured to generate a target convective heat transfer characteristic and a target flow resistance characteristic according to the target reynolds number and the target prandtl number through the flow heat transfer model.

In the scheme of the embodiment of the invention, the characteristic extraction is carried out according to the preset bending micro-channel structure to obtain the dimensionless characteristic parameters of the bending micro-channel structure; obtaining flow heat transfer parameters according to the bent micro-channel structure by a numerical simulation method; according to the flow heat transfer parameters and the dimensionless characteristic parameters, the constructed flow heat transfer semi-empirical relation is fitted to obtain a flow heat transfer model.

The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

Embodiments of the present invention provide a computer device, including a memory and a processor, where the memory is used to store information including program instructions, and the processor is used to control execution of the program instructions, and the program instructions are loaded and executed by the processor to implement the steps of the above-mentioned method for constructing a flow heat transfer model based on dimensionless characteristic parameters.

Referring now to FIG. 12, shown is a schematic block diagram of a computer device 600 suitable for use in implementing embodiments of the present application.

As shown in fig. 12, the computer apparatus 600 includes a Central Processing Unit (CPU) 601 that can execute various appropriate jobs and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data necessary for the operation of the computer apparatus 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.

The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output section 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback (LCD), and the like, and a speaker and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The driver 610 is also connected to the I/O interface 605 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that a computer program read out therefrom is mounted as necessary on the storage section 608.

In particular, the processes described above with reference to the flowcharts may be implemented as a computer software program according to an embodiment of the present invention. For example, embodiments of the invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 609 and/or installed from the removable medium 611.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the various elements may be implemented in the same one or more pieces of software and/or hardware in the practice of the present application.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element.

According to the technical scheme, the data acquisition, storage, use, processing and the like meet relevant regulations of national laws and regulations.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A flow heat transfer model building method based on dimensionless characteristic parameters is characterized by comprising the following steps:

obtaining a flow heat transfer parameter according to the bent micro-channel structure by a numerical simulation method;

and fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model.

2. The method for constructing the flow heat transfer model based on the dimensionless characteristic parameter of claim 1, wherein the extracting the characteristic according to the preset bending micro-channel structure to obtain the dimensionless characteristic parameter of the bending micro-channel structure comprises:

3. The method of constructing a flow heat transfer model based on dimensionless number of parameters according to claim 2, wherein the feature triangles include channel feature triangles and flow feature triangles, the structural parameters include channel width, deflection angle and longitudinal pitch, and the dimensionless number of parameters includes channel feature parameters;

the generating of the dimensionless characteristic parameter of the bent micro-channel structure according to the structural parameter of the bent micro-channel structure and the plurality of characteristic triangles comprises:

and according to the width, the deflection angle and the longitudinal pitch of the flow channel, performing similarity ratio calculation on the channel characteristic triangle and the flow characteristic triangle to obtain flow channel characteristic parameters.

4. The method for constructing a flow heat transfer model based on dimensionless characteristic parameters of claim 2, wherein the characteristic triangles include rib wall characteristic triangles and flow characteristic triangles, the structural parameters include rib wall width, deflection angle and longitudinal pitch, and the dimensionless characteristic parameters include rib wall characteristic parameters;

5. The method of constructing a flow heat transfer model based on dimensionless number of parameters according to claim 2, wherein the feature triangles include fillet feature triangles and flow feature triangles, the structural parameters include fillet radius and longitudinal pitch, and the dimensionless number of parameters includes fillet feature parameters;

the method for generating the dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters and the characteristic triangles of the bent micro-channel structure comprises the following steps:

6. The method of constructing a flow heat transfer model based on dimensionless number of parameters according to claim 2, wherein the structural parameters include a deflection angle and the dimensionless number of parameters include a deflection number;

7. The method for constructing the flow heat transfer model based on the dimensionless characteristic parameters of claim 1, wherein the dimensionless characteristic parameters comprise flow channel characteristic parameters, rib wall characteristic parameters and fillet characteristic parameters, and the flow heat transfer semi-empirical relation comprises a continuous relation and a discontinuous relation;

the step of fitting the constructed flow heat transfer semi-empirical relation according to the flow heat transfer parameters and the dimensionless characteristic parameters to obtain a flow heat transfer model comprises the following steps:

if the type of the bent micro-channel structure is continuous, fitting and calculating the continuous relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters and the fillet characteristic parameters to obtain a constant coefficient of the continuous micro-channel;

obtaining a flow heat transfer model corresponding to the continuous type bent micro-channel structure according to the constant coefficient of the continuous type micro-channel and the continuous type relational expression;

if the type of the bent micro-channel structure is discontinuous, fitting and calculating the discontinuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter to obtain a discontinuous micro-channel constant coefficient;

8. The method for constructing the flow heat transfer model based on the dimensionless characteristic parameter of claim 7, wherein the flow heat transfer parameters comprise convective heat transfer characteristics, flow resistance characteristics, reynolds number and Plantt number;

before performing fitting calculation on the continuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter and the fillet characteristic parameter to obtain a continuous micro-channel constant coefficient, the method further includes:

9. The method for constructing the flow heat transfer model based on the dimensionless characteristic parameter of claim 7, wherein the flow heat transfer parameters comprise convective heat transfer characteristics, flow resistance characteristics, reynolds number and Plantt number;

before fitting and calculating the discontinuous relational expression according to the flow heat transfer parameters, the flow channel characteristic parameters, the rib wall characteristic parameters and the fillet characteristic parameters to obtain the constant coefficients of the discontinuous micro-channel, the method further comprises the following steps:

and establishing a functional relation between the convection heat exchange characteristic and the Reynolds number, the Prandtl number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a discontinuous relational expression.

10. The method for constructing a flow heat transfer model based on dimensionless characteristic parameters of claim 1, wherein after the fitting the constructed semi-empirical relationship of flow heat transfer according to the flow heat transfer parameters and dimensionless characteristic parameters to obtain the flow heat transfer model, the method further comprises:

obtaining a target Reynolds number and a target Plantt number;

and generating a target convection heat exchange characteristic and a target flow resistance characteristic according to the target Reynolds number and the target Plantt number through the flow heat transfer model.

11. A flow heat transfer model construction device based on dimensionless characteristic parameters, the device comprising:

12. The flow heat transfer model construction device based on dimensionless characteristic parameters of claim 11, wherein the characteristic extraction unit is specifically configured to perform a characterization process on the bent micro-channel structure to obtain a plurality of characteristic triangles of the bent micro-channel structure; and generating dimensionless characteristic parameters of the bent micro-channel structure according to the structural parameters of the bent micro-channel structure and the characteristic triangles.

13. The non-dimensional characteristic parameter-based flow heat transfer model building device according to claim 12, wherein the characteristic triangles include a channel characteristic triangle and a flow characteristic triangle, the structural parameters include a flow channel width, a deflection angle and a longitudinal pitch, and the non-dimensional characteristic parameters include a flow channel characteristic parameter;

the feature extraction unit is specifically configured to perform similarity ratio calculation on the channel feature triangle and the flow feature triangle according to the flow channel width, the deflection angle, and the longitudinal pitch, so as to obtain a flow channel feature parameter.

14. The non-dimensional characteristic parameter-based flow heat transfer model building device according to claim 12, wherein the characteristic triangles include rib wall characteristic triangles and flow characteristic triangles, the structural parameters include rib wall width, deflection angle and longitudinal pitch, and the non-dimensional characteristic parameters include rib wall characteristic parameters;

the feature extraction unit is specifically configured to perform similarity ratio calculation on the rib wall feature triangle and the flow feature triangle according to the rib wall width, the deflection angle and the longitudinal pitch, so as to obtain a rib wall feature parameter.

15. The non-dimensional characteristic parameter-based flow heat transfer model building device according to claim 12, wherein the characteristic triangles include a fillet characteristic triangle and a flow characteristic triangle, the structural parameters include a fillet radius and a longitudinal pitch, and the non-dimensional characteristic parameters include a fillet characteristic parameter;

the feature extraction unit is specifically configured to perform similarity ratio calculation on the fillet feature triangle and the flow feature triangle according to the fillet radius and the longitudinal pitch to obtain fillet feature parameters.

16. The non-dimensional characteristic parameter based flow heat transfer model building apparatus of claim 12, wherein the structural parameter comprises a deflection angle, and the non-dimensional characteristic parameter comprises a deflection characteristic parameter;

the feature extraction unit is specifically configured to determine a sine value of the deflection angle as a deflection feature parameter.

17. The non-dimensional characteristic parameter-based flow heat transfer model construction device according to claim 11, wherein the non-dimensional characteristic parameters comprise flow channel characteristic parameters, rib wall characteristic parameters and fillet characteristic parameters, and the flow heat transfer semi-empirical relationship comprises a continuous relationship and an intermittent relationship;

the fitting unit is specifically configured to perform fitting calculation on the continuous type relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter and the fillet characteristic parameter if the type of the bent micro-channel structure is continuous, so as to obtain a constant coefficient of the continuous micro-channel; obtaining a flow heat transfer model corresponding to the continuous bent micro-channel structure according to the continuous micro-channel constant coefficient and the continuous relational expression; if the type of the bent micro-channel structure is discontinuous, fitting and calculating the discontinuous relational expression according to the flow heat transfer parameter, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter to obtain a discontinuous micro-channel constant coefficient; and obtaining a flow heat transfer model corresponding to the discontinuous bending micro-channel structure according to the constant coefficient of the discontinuous micro-channel and the discontinuous relational expression.

18. The non-dimensional characteristic parameter-based flow heat transfer model building device according to claim 17, wherein the flow heat transfer parameters include convective heat transfer characteristics, flow resistance characteristics, reynolds number and prandtl number; the device further comprises:

and the first construction unit is used for establishing the functional relationship between the convective heat transfer characteristic and the Reynolds number, the Plantt number, the flow channel characteristic parameter and the fillet characteristic parameter and the functional relationship between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a continuous relational expression.

19. The non-dimensional characteristic parameter-based flow heat transfer model building device according to claim 17, wherein the flow heat transfer parameters include convective heat transfer characteristics, flow resistance characteristics, reynolds number and prandtl number; the device further comprises:

and the second construction unit is used for establishing a functional relation between the convection heat exchange characteristic and a Reynolds number, a Prandtl number, a flow channel characteristic parameter, a rib wall characteristic parameter and a fillet characteristic parameter and a functional relation between the flow resistance characteristic and the Reynolds number, the flow channel characteristic parameter, the rib wall characteristic parameter and the fillet characteristic parameter through an elementary function to obtain a discontinuous relational expression.

20. The non-dimensional characteristic parameter-based flow heat transfer model building apparatus according to claim 11, further comprising:

21. A computer-readable medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out a method of constructing a flow heat transfer model based on dimensionless number of characteristic parameters according to any one of claims 1 to 10.

22. A computer device comprising a memory for storing information including program instructions and a processor for controlling the execution of the program instructions, wherein the program instructions are loaded and executed by the processor to implement the method for constructing a flow heat transfer model based on dimensionless number of characteristic parameters according to any one of claims 1 to 10.

23. A computer program product comprising computer programs/instructions, characterized in that the computer programs/instructions, when executed by a processor, implement the method of constructing a flow heat transfer model based on dimensionless number of characteristic parameters according to any of claims 1 to 10.