CN115452312B - Hot gas flow measurement and control method and system - Google Patents
Hot gas flow measurement and control method and system Download PDFInfo
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- CN115452312B CN115452312B CN202211317601.6A CN202211317601A CN115452312B CN 115452312 B CN115452312 B CN 115452312B CN 202211317601 A CN202211317601 A CN 202211317601A CN 115452312 B CN115452312 B CN 115452312B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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Abstract
The application relates to the technical field of wind tunnel tests and provides a hot air flow measurement and control method and system. The method comprises the following steps: acquiring a corresponding relation between a first flow and an opening degree of the adjustable venturi; when measuring and controlling the hot air flow, acquiring a target opening according to the target flow and the corresponding relation between the first flow and the opening; and adjusting the opening degree of the adjustable venturi to a target opening degree to control the first flow of the adjustable venturi to be a target flow. By the method, the problems that the process of measuring and controlling the hot air flow is not convenient and the like can be effectively solved.
Description
Technical Field
The application relates to the technical field of wind tunnel tests, in particular to a hot air flow measurement and control method and system.
Background
When the aircraft is in flight, its windward components strike supercooled water droplets in the cloud, causing the aircraft to ice. The icing of the aircraft can cause the flight performance to be obviously reduced, the components to be damaged and even the aircraft to be damaged and the people to be killed. In order to ensure flight safety, an anti-icing and deicing device needs to be installed on parts such as aircraft wings. Hot gas deicing is one of the most common deicing methods. The hot gas ice prevention and removal device enables hot gas led out by an engine compressor to flow into the ice prevention cavity through the air guide pipe, heat is transferred to the ice prevention surface, and the purpose of ice prevention and removal is achieved.
For the flow control of the bleed air pipe, an adjustable venturi and a standard critical flow venturi are generally adopted to measure and control the hot air flow. Specifically, flow control is performed using an adjustable venturi, and flow measurement is performed using a standard critical flow venturi. And if the flow measured by the standard critical flow venturi is not the target flow, adjusting the adjustable venturi to adjust the flow until the flow measured by the standard critical flow venturi is the target flow.
In the process of implementing the invention, the inventor finds that at least the following exists in the prior art: the process of measuring and controlling the hot air flow is not convenient enough, and the like.
Disclosure of Invention
The inventor of the application finds out through long-term practice that: on one hand, in order to meet the critical state, the throat area of the standard critical flow venturi needs to be smaller than the minimum flow area of the model, but the throat area of the standard critical flow venturi cannot be too small, otherwise the passing flow cannot meet the target flow. For the working condition with a large flow regulation range, when the hot air flow is measured and controlled, the standard critical flow venturi tube needs to be replaced according to the requirement, which is not convenient enough. On the other hand, when the flow of hot air is measured and controlled by the adjustable venturi and the standard critical flow venturi, the flow may need to be measured by the standard critical flow venturi for many times, if the flow is not the target flow, the adjustable venturi is adjusted to adjust the flow until the measured flow is the target flow, and the process is complex and inconvenient.
Based on the above, the application provides a hot gas flow measurement and control method, which obtains the corresponding relation between the first flow and the opening degree of the adjustable venturi; when the hot airflow is measured and controlled, acquiring a target opening according to the target flow and the corresponding relation between the first flow and the opening; and adjusting the opening of the adjustable venturi to the target opening to control the first flow of the adjustable venturi as a target flow. Therefore, when the hot air flow is measured and controlled, the flow is not required to be measured for many times by using the standard critical flow venturi, and the adjustable venturi is adjusted to adjust the flow, so that the process is simpler and more convenient, and in addition, the standard critical flow venturi is not required to be replaced, so that the convenience is improved. Therefore, the problem that the process of measuring and controlling the hot air flow is not convenient enough can be effectively solved.
In a first aspect, a hot gas flow measurement and control method is provided, the method comprising: s110, acquiring a corresponding relation between a first flow and an opening degree of an adjustable venturi; s120, when the hot air flow is measured and controlled, obtaining a target opening according to the target flow and the corresponding relation between the first flow and the opening; s130, adjusting the opening degree of the adjustable venturi to a target opening degree to control the first flow of the adjustable venturi to be a target flow.
In a second aspect, there is also provided a thermal airflow measurement and control system, comprising: the device comprises an adjustable venturi, a main air guide pipe path, a first pressure sensor, a first temperature sensor, a back pressure valve and an air guide pipe branch path; the air guide pipe branch is connected with a first node of the air guide pipe main path; the adjustable venturi is arranged at the rear end of a first node of the main path of the bleed air pipe, and the first pressure sensor and the first temperature sensor are arranged between the first node and the adjustable venturi; the back pressure valve is arranged on the bleed pipe branch.
In summary, the present application has at least the following technical effects:
1. according to the hot gas flow measurement and control method, the corresponding relation between the first flow and the opening of the adjustable venturi is obtained, when the hot gas flow is measured and controlled, the first flow can be directly obtained as the target flow through the corresponding relation between the first flow and the opening, the flow is not required to be measured by the standard critical flow venturi for multiple times, the adjustable venturi is adjusted to adjust the flow, and the process is simpler and more convenient.
2. According to the hot gas flow measurement and control method, the corresponding relation between the first flow and the opening degree of the adjustable venturi tube is obtained, when the hot gas flow is measured and controlled, the first flow can be directly obtained as the target flow through the corresponding relation between the first flow and the opening degree, the flow is not required to be measured by using the standard critical flow venturi tube, therefore, the standard critical flow venturi tube is not required to be replaced, and the process is more convenient.
3. According to the hot gas flow measurement and control method, the corresponding relation between the first flow and the opening of the adjustable venturi tube is obtained, when the hot gas flow is measured and controlled, if the target flow is within the preset flow range, the adjustable venturi tube and the standard critical flow venturi tube are used for measuring and controlling the hot gas flow, if the target flow is not within the preset flow range, the first flow is known to be the target flow through the corresponding relation between the first flow and the opening, and the standard critical flow venturi tube is not used for measuring the flow. Therefore, when the target flow exceeds the flow range which can be measured by the standard critical flow venturi, the standard critical flow venturi does not need to be replaced, and the process is more convenient. Moreover, when the target flow is within the preset flow range, the problem that the corresponding relation between the first flow and the opening degree becomes inaccurate after a long time can be avoided, and the measurement of the first flow is more accurate.
4. After the adjustable venturi tube is impacted by high-pressure airflow for a long time, the stroke of the valve core drifts, so that the corresponding relation between the opening and the area of the first throat can be changed, and correspondingly, the corresponding relation between the opening and the first flow can be changed. Therefore, the correspondence relationship of the first flow rate to the opening degree may become inaccurate after a long time. According to the hot gas flow measurement and control method, the corresponding relation between the first flow and the opening of the adjustable venturi tube is obtained once every preset time, so that the problem that the corresponding relation between the first flow and the opening is inaccurate after a long time can be effectively solved.
Therefore, the scheme provided by the application can effectively solve the problems that the process of measuring and controlling the hot air flow is not convenient enough and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a hot gas flow measurement and control method provided in embodiment 1 of the present application;
fig. 2 shows a schematic diagram of a hot airflow measurement and control system provided in embodiment 4 of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For the flow control of the bleed air pipe, an adjustable venturi and a standard critical flow venturi are generally adopted to measure and control the hot air flow. Specifically, an adjustable venturi is used for flow control, and a standard critical flow venturi is used for flow measurement. And if the flow measured by the standard critical flow venturi is not the target flow, adjusting the adjustable venturi to adjust the flow until the flow measured by the standard critical flow venturi is the target flow. However, the prior art has the problems that the process of measuring and controlling the hot air flow is not convenient enough, and the like.
Therefore, in order to solve the above-mentioned drawbacks, an embodiment of the present application provides a hot gas flow measurement and control method, which obtains a corresponding relationship between a first flow rate and an opening degree of an adjustable venturi; when the hot airflow is measured and controlled, acquiring a target opening according to the target flow and the corresponding relation between the first flow and the opening; and adjusting the opening degree of the adjustable venturi to the target opening degree so as to control the first flow of the adjustable venturi to be the target flow. Therefore, when the hot air flow is measured and controlled, the flow is not required to be measured for many times by using the standard critical flow venturi, and the adjustable venturi is adjusted to adjust the flow, so that the process is simpler and more convenient, and in addition, the standard critical flow venturi is not required to be replaced, so that the convenience is improved. Therefore, the problem that the process of measuring and controlling the hot air flow is not convenient enough can be effectively solved.
The hot gas flow measurement and control method to which the present application relates is described below.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for measuring and controlling a hot gas flow according to embodiment 1 of the present application. It should be noted that: the reference numbers to the method steps of the present application are not intended to limit the order thereof, but rather to distinguish the different steps.
The hot gas flow measurement and control method provided in embodiment 1 may include the steps of:
step S110: and acquiring the corresponding relation between the first flow and the opening degree of the adjustable venturi.
In this embodiment, the adjustable venturi tube may include a valve element, a laval nozzle, and an electric actuator, and the electric actuator drives the valve element to operate by adjusting an opening of the adjustable venturi tube, so that a change in a stroke of the valve element changes a flow area of the laval nozzle, that is, a throat area of the adjustable venturi tube, thereby changing a first flow rate of the adjustable venturi tube.
In an exemplary embodiment, step S110 may include sub-step S111 to sub-step S114.
Substep S111: in a preset environment, acquiring a first flow of an adjustable venturi under a plurality of opening degrees, wherein the preset environment comprises: the front end pressure of the adjustable venturi is a first preset pressure, and the front end temperature of the adjustable venturi is a first preset temperature.
In this embodiment of the application, the preset environment may be an environment when the corresponding relationship between the first flow rate and the opening degree is calibrated, and the first preset pressure and the first preset temperature may be kept unchanged.
In the embodiment of the present application, the first flow rate of the plurality of opening degrees may be measured by a flow meter.
In an exemplary embodiment, a first flow rate of the adjustable venturi at a plurality of opening degrees in a preset environment is measured through a standard critical flow venturi disposed at a rear end of the adjustable venturi.
As an optional implementation manner, when the adjustable venturi and the standard critical flow venturi simultaneously satisfy the critical state, in a preset environment, according to a second throat area of the standard critical flow venturi, a second preset pressure and a second preset temperature at a plurality of opening degrees, a second flow of the standard critical flow venturi at the plurality of opening degrees is obtained, and the second flow of the standard critical flow venturi is used as a first flow of the adjustable venturi, wherein the preset environment further includes: the pressure between the adjustable venturi and the standard critical flow venturi is a second preset pressure, and the temperature between the adjustable venturi and the standard critical flow venturi is a second preset temperature.
In the preset environment, the plurality of opening degrees may be: and when the adjustable venturi and the standard critical flow venturi meet the critical state, the opening degree of the adjustable venturi.
Illustratively, in the preset environment, the opening degree of the adjustable venturi is set stepwise at intervals of 5%
K denotes an opening degree, i denotes the number of opening degrees of different sizes, and i is a natural number from 1 to 20. Judging whether the adjustable venturi and the standard critical flow venturi are in a critical state or not according to the first preset pressure, the second preset pressure and the rear end pressure of the standard critical flow venturi, and marking the opening degree of the adjustable venturi and the standard critical flow venturi which simultaneously meet the critical state as an opening degree
J is adjustableThe venturi and the standard critical flow venturi simultaneously satisfy the serial numbers of the opening degrees of the critical state, and j is a natural number from 1 to 20, and the plurality of opening degrees in the sub-step S111 may be all of the opening degrees
。
In the embodiment of the application, when the adjustable venturi and the standard critical flow venturi simultaneously satisfy the critical state, the critical state is satisfied for each opening degree
Second predetermined pressure
A second preset temperature
Second throat area
Second flow rate
Satisfies the relation:
。
in the embodiment of the application, when the adjustable venturi and the standard critical flow venturi simultaneously satisfy the critical state, the magnitude of the first flow rate is equal to the magnitude of the second flow rate.
Substep S112: and acquiring the first throat area of the adjustable venturi at the plurality of opening degrees according to the first preset pressure, the first preset temperature and the first flow at the plurality of opening degrees.
In the embodiment of the application, when the adjustable venturi and the standard critical flow venturi simultaneously satisfy the critical state, the critical state is satisfied for each opening degree
First preset pressure of
A first preset temperature
First throat area
First flow rate
Satisfy the relation:
。
substep S113: and fitting the plurality of opening degrees with the first throat area under the plurality of opening degrees to obtain the fitting relation between the first throat area and the opening degrees.
Illustratively, the plurality of opening degrees and the first throat area under the plurality of opening degrees are linearly fitted, and the fitting relation of the first throat area and the opening degrees is obtained:
wherein a is a first fitting parameter, and b is a second fitting parameter.
Substep S114: in an actual environment, obtaining a corresponding relation between the first flow and the opening according to a first actual pressure and a first actual temperature, and a fitting relation between the first throat area and the plurality of openings, wherein the actual environment comprises: the front end pressure of the adjustable venturi is the first actual pressure, and the front end temperature of the adjustable venturi is the first actual temperature.
In the embodiment of the present application, the actual environment may be an environment when the hot gas flow is measured and controlled, and the first actual pressure and the first actual temperature may be kept unchanged.
In the actual environment of the environment,at each opening degree
First actual pressure of
First actual temperature
First throat area
First flow rate
Satisfy the relation:
。
will be provided with
Substituted into
The first flow rate can be obtained
Opening degree of
The corresponding relationship of (1).
In an exemplary embodiment, step S110 may further include sub-steps S115 to S116.
Substep S115: and acquiring a first flow of the adjustable venturi at a plurality of opening degrees.
Substep S116: fitting the plurality of opening degrees with the first flow under the plurality of opening degrees to obtain the corresponding relation between the first flow and the opening degrees.
If the preset environment is the same as the actual environment, the corresponding relation between the first flow and the opening degree can be directly obtained without calculating the fitting relation between the first throat area and the opening degree.
In this embodiment of the present application, the first flow rate of the multiple openings may be measured by a flow meter, specifically, may be measured by a standard critical flow venturi set at a rear end of the adjustable venturi, and the content of the substep S111 may be referred to in a measurement manner, which is not described herein again.
Illustratively, a plurality of opening degrees and a first flow rate under the plurality of opening degrees are subjected to linear fitting, and a fitting relation between the first flow rate and the opening degrees is obtained:
wherein c is a third fitting parameter,
is the fourth fitting parameter.
Step S120: and when the hot air flow is measured and controlled, acquiring the target opening according to the target flow and the corresponding relation between the first flow and the opening.
In the embodiment of the application, when measuring and controlling the hot airflow, the target flow can be substituted into the first flow
Opening degree
Thereby obtaining: a target opening degree when the first flow rate is a target flow rate.
Step S130: and adjusting the opening degree of the adjustable venturi to a target opening degree so as to control the first flow rate of the adjustable venturi to be the target flow rate.
According to the hot gas flow measurement and control method provided by the embodiment of the application, the corresponding relation between the first flow and the opening degree of the adjustable venturi is obtained, when the hot gas flow is measured and controlled, the first flow can be directly obtained as the target flow through the corresponding relation between the first flow and the opening degree, the flow is not required to be measured for many times by using the standard critical flow venturi, the adjustable venturi is adjusted to adjust the flow, and the process is simpler and more convenient.
According to the hot gas flow measurement and control method provided by the embodiment of the application, the corresponding relation between the first flow and the opening degree of the adjustable venturi is obtained, when the hot gas flow is measured and controlled, the first flow can be directly obtained as the target flow through the corresponding relation between the first flow and the opening degree, the flow is not required to be measured by using the standard critical flow venturi, therefore, the standard critical flow venturi does not need to be replaced, and the process is more convenient.
Example 2
On the basis of the embodiment 1, the embodiment 2 provides another hot gas flow measurement and control method.
The hot gas flow measurement and control method provided in embodiment 2 may include: step S110 in embodiment 1 is executed every preset time.
In the embodiment of the present application, the preset time may be a fixed time, for example, the preset time may be two days, or a time determined according to the performance parameters of the adjustable venturi. The preset time may also be a variable time. For example, the preset time may be a time for performing an anti-icing test.
After the adjustable venturi tube is impacted by high-pressure airflow for a long time, the stroke of the valve core drifts, so that the corresponding relation between the opening and the area of the first throat may change, and correspondingly, the corresponding relation between the opening and the first flow may change. Therefore, the correspondence relationship of the first flow rate to the opening degree may become inaccurate after a long time.
Generally, after calibrating the corresponding relationship between the opening degree and the first flow rate within the preset time, the corresponding relationship between the opening degree and the first flow rate does not change greatly, and therefore, the method in embodiment 1 can be directly executed within the preset time. However, after the preset time is exceeded, the correspondence relationship between the opening degree and the first flow rate may change, and the correspondence relationship between the opening degree and the first flow rate is calibrated again, so that an error caused by the change can be eliminated.
According to the hot gas flow measurement and control method provided by the embodiment of the application, the corresponding relation between the first flow and the opening degree of the adjustable venturi tube is obtained every other preset time, so that the problem that the corresponding relation between the first flow and the opening degree is inaccurate after a long time can be effectively solved.
Example 3
On the basis of the embodiment 1 and/or the embodiment 2, the embodiment 3 provides another hot gas flow measurement and control method. It should be noted that: the reference numbers to method steps of the present application are not intended to limit the order thereof, but rather to distinguish between the different steps.
The hot gas flow measurement and control method provided in embodiment 3 may include the steps of:
step S140: when measuring and controlling the hot air flow, if the target flow is within the preset flow range, measuring the first flow of the adjustable venturi through a standard critical flow venturi arranged at the rear end of the adjustable venturi, and when the first flow is not the target flow, controlling the adjustable venturi to adjust the first flow until the first flow measured by the standard critical flow venturi is the target flow, wherein the preset flow range is the flow range which can be measured by the standard critical flow venturi.
In the embodiment of the application, in order to meet the critical state, the throat area of the standard critical flow venturi needs to be smaller than the minimum flow area of the model, but the throat area of the standard critical flow venturi cannot be too small, otherwise the flow passing through the standard critical flow venturi cannot meet the target flow. And when the flow passing through the standard critical flow venturi can meet the target flow, measuring the hot air flow by using the standard critical flow venturi.
Step S150: if the target flow rate is not within the preset flow rate range, step S120 and step S130 are executed.
In the embodiment of the present application, when the flow rate passing through the standard critical flow venturi cannot meet the target flow rate, the method of embodiment 1 is adopted to avoid replacing the standard critical flow venturi, or: the method of example 1 and example 2, the hot gas flow was measured and controlled.
According to the hot gas flow measurement and control method provided by the embodiment of the application, through obtaining the corresponding relation between the first flow and the opening of the adjustable venturi tube, when the hot gas flow is measured and controlled, if the target flow is within the preset flow range, the adjustable venturi tube and the standard critical flow venturi tube are used for measuring and controlling the hot gas flow, and if the target flow is not within the preset flow range, the first flow is known to be the target flow through the corresponding relation between the first flow and the opening, and the standard critical flow venturi tube is not used for measuring the flow. Therefore, when the target flow exceeds the flow range which can be measured by the standard critical flow venturi, the standard critical flow venturi does not need to be replaced, and the process is more convenient. Moreover, when the target flow rate is within the preset flow rate range, the problem that the corresponding relation between the first flow rate and the opening degree possibly becomes inaccurate after a long time can be avoided, and the measurement of the first flow rate is more accurate.
Example 4
Referring to fig. 2, fig. 2 is a schematic view of a thermal current measurement and control system provided in embodiment 4 of the present application. The hot gas flow measurement and control system can be used to perform the methods of embodiments 1, 2, and 3.
Embodiment 4 provides a hot gas flow measurement and control system that may comprise: an adjustable venturi 210, a main bleed air duct path 201, a first pressure sensor 211, a first temperature sensor 212, a back pressure valve 204, and a bleed air duct branch 202.
The bleed air duct branch 202 is connected to a first node 203 of the main bleed air duct path 201.
Illustratively, in fig. 2, hot gas flows from the left side of the main bleed air duct path 201 to the first node 203 and from the first node 203 to the right side of the main bleed air duct path 201 and to the bleed air duct branch 202.
The inlet of the adjustable venturi 210 is arranged behind the first node 203 of the main bleed air duct path 201, and the first pressure sensor 211 and the first temperature sensor 212 are arranged between the first node 203 and the inlet of the adjustable venturi 210.
In the present embodiment, an adjustable venturi 210 may be used to control the flow rate. Specifically, the adjustable venturi 210 may include a valve core, a laval nozzle, and an electric actuator, and the electric actuator drives the valve core to operate by adjusting an opening of the adjustable venturi 210, and a change in a stroke of the valve core changes a flow area of the laval nozzle, that is, a throat area of the adjustable venturi 210, so as to change a first flow rate of the adjustable venturi 210.
As an alternative embodiment, the hot gas flow measurement and control system may further include: and a controller. The controller may be connected to the electric actuator of the adjustable venturi 210, and may be configured to control the electric actuator to drive the valve element of the adjustable venturi 210 to operate.
In the embodiment of the present application, the rear end refers to a place where the hot gas passes after flowing along the direction of the gas flow, for example, the rear end of the first node 203 refers to: where the hot gases flow after passing through the first node 203. The front end refers to a place where the hot gas passes when flowing along the direction of the gas flow, for example, the front end of the first node 203 refers to: where the hot gases flow before passing through the first node 203.
In the embodiment of the present application, the first pressure sensor 211 may be used to acquire the first preset pressure and the first actual pressure in embodiments 1, 2, and 3.
The first temperature sensor 212 may be used to acquire the first preset temperature and the first actual temperature in embodiment 1, embodiment 2, and embodiment 3.
A backpressure valve 204 is disposed on the bleed conduit branch 202.
In the present embodiment, the backpressure valve 204 may be used to control the first preset pressure and the first actual pressure in embodiment 1, embodiment 2, and embodiment 3, and specifically, may be used to keep the first preset pressure and the first actual pressure constant.
In an exemplary embodiment, the hot gas flow measurement and control system may further include: a standard critical flow venturi 220, a second pressure sensor 221, and a second temperature sensor 222.
An inlet of the standard critical flow venturi 220 is disposed at a rear end of an outlet of the adjustable venturi 210, and a second pressure sensor 221 and a second temperature sensor 222 are disposed between the adjustable venturi 210 and the standard critical flow venturi 220.
In an embodiment of the present application, a standard critical flow venturi 220 may be used to measure flow. Also, the second throat area of the standard critical flow venturi 220 is less than the first throat area of the adjustable venturi 210.
In the embodiment of the present application, the second pressure sensor 221 may be used to acquire the second preset pressure in embodiments 1, 2, and 3.
The second temperature sensor 222 may be used to acquire the second preset temperature in embodiment 1, embodiment 2, and embodiment 3.
As an alternative embodiment, the hot airflow measuring and controlling system may further include: a third pressure sensor 231, and the third pressure sensor 231 is disposed at the rear end of the outlet of the standard critical flow venturi 220.
In the embodiment of the present application, the third pressure sensor 231 may be used to obtain the rear end pressure of the standard critical flow venturi 220 in embodiments 1, 2, and 3.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. A hot gas flow measurement and control method, the method comprising:
s110, acquiring a corresponding relation between a first flow and an opening degree of an adjustable venturi;
s120, when measuring and controlling the hot air flow, acquiring a target opening according to the target flow and the corresponding relation between the first flow and the opening;
s130, adjusting the opening degree of the adjustable venturi to the target opening degree so as to control the first flow of the adjustable venturi to be the target flow;
step S110 includes:
in a preset environment, acquiring a first flow of the adjustable venturi at a plurality of opening degrees, wherein the preset environment comprises: the front end pressure of the adjustable venturi is a first preset pressure, and the front end temperature of the adjustable venturi is a first preset temperature;
acquiring a first throat area of the adjustable venturi at the plurality of opening degrees according to the first preset pressure, the first preset temperature and the first flow at the plurality of opening degrees;
fitting the plurality of opening degrees with the first throat area under the plurality of opening degrees to obtain the fitting relation between the first throat area and the opening degrees;
in an actual environment, obtaining a corresponding relation between the first flow and the opening according to a first actual pressure and a first actual temperature, and a fitting relation between the first throat area and the plurality of openings, wherein the actual environment comprises: the front end pressure of the adjustable venturi is the first actual pressure, and the front end temperature of the adjustable venturi is the first actual temperature.
2. The hot gas flow measurement and control method according to claim 1, wherein step S110 comprises:
and measuring the first flow of the adjustable venturi at the plurality of opening degrees in the preset environment through a standard critical flow venturi arranged at the rear end of the adjustable venturi.
3. The hot gas flow measurement and control method according to claim 2, wherein step S110 comprises:
in the preset environment, according to a second throat area of the standard critical flow venturi, a second preset pressure and a second preset temperature under the plurality of opening degrees, a second flow of the standard critical flow venturi under the plurality of opening degrees is obtained, and the second flow of the standard critical flow venturi is used as a first flow of the adjustable venturi, wherein the preset environment further comprises: and the pressure between the adjustable venturi and the standard critical flow venturi is the second preset pressure, and the temperature between the adjustable venturi and the standard critical flow venturi is the second preset temperature.
4. The hot gas flow measurement and control method of claim 2, wherein, in a preset environment, the plurality of opening degrees are: and when the adjustable venturi and the standard critical flow venturi simultaneously meet the critical state, the opening degree of the adjustable venturi.
5. The hot gas flow measurement and control method according to claim 1, wherein step S110 comprises:
acquiring a first flow of the adjustable venturi at a plurality of opening degrees;
fitting the plurality of opening degrees with the first flow under the plurality of opening degrees to obtain the corresponding relation between the first flow and the opening degrees.
6. The hot gas flow measurement and control method according to any one of claims 1 to 5, wherein the step S110 is performed every predetermined time.
7. The hot gas flow measurement and control method according to any one of claims 1 to 5, wherein the means for measuring and controlling the hot gas flow further comprises:
s140, when measuring and controlling the hot air flow, if the target flow is within a preset flow range, measuring a first flow of an adjustable venturi through a standard critical flow venturi arranged at the rear end of the adjustable venturi, and when the first flow is not the target flow, controlling the adjustable venturi to adjust the first flow until the first flow measured by the standard critical flow venturi is the target flow, wherein the preset flow range is a flow range which can be measured by the standard critical flow venturi;
s150, if the target flow is not within the preset flow range, executing the step S120 and the step S130.
8. A thermal airflow measurement and control system for performing the method of any of claims 1 to 7, the system comprising: the device comprises an adjustable venturi, a main air guide pipe path, a first pressure sensor, a first temperature sensor, a back pressure valve and an air guide pipe branch path;
the air guide pipe branch is connected with a first node of the main air guide pipe path;
the adjustable venturi is arranged at the rear end of a first node of the main air guide pipe path, and the first pressure sensor and the first temperature sensor are arranged between the first node and the adjustable venturi;
the back pressure valve is arranged on the bleed air pipe branch.
9. The hot gas flow measurement and control system of claim 8, further comprising: the standard critical flow venturi, the second pressure sensor and the second temperature sensor;
the standard critical flow venturi is arranged at the rear end of the adjustable venturi, and the second pressure sensor and the second temperature sensor are arranged between the adjustable venturi and the standard critical flow venturi.
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