CN118376381B - Pressure testing device and method for pressure testing rake and air inlet channel - Google Patents
Pressure testing device and method for pressure testing rake and air inlet channel Download PDFInfo
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- CN118376381B CN118376381B CN202410817820.3A CN202410817820A CN118376381B CN 118376381 B CN118376381 B CN 118376381B CN 202410817820 A CN202410817820 A CN 202410817820A CN 118376381 B CN118376381 B CN 118376381B
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
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- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000010998 test method Methods 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims description 19
- 239000003595 mist Substances 0.000 claims description 10
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Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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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
- G01M9/08—Aerodynamic models
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- Aviation & Aerospace Engineering (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention relates to a pressure measuring harrow, an air inlet channel pressure test device and a test method, wherein the pressure measuring harrow comprises a harrow body and a pressure guiding pipe, the pressure guiding pipe comprises a first pressure guiding pipe and a second pressure guiding pipe, and the first pressure guiding pipe and the second pressure guiding pipe are arranged on the harrow body; one end of the first pressure guiding pipe and one end of the second pressure guiding pipe are used for being communicated with the external incoming flow direction of the air inlet channel, and the other end of the first pressure guiding pipe and the other end of the second pressure guiding pipe are communicated with the pressure measuring valve through the hollow pipeline so as to realize pressure measurement of incoming flow; the first pressure guiding pipes comprise a plurality of pressure guiding pipes which are circumferentially arranged along the outermost circumference of the pressure measuring rake; the second pressure guiding pipes comprise a plurality of pressure guiding pipe groups which are circumferentially arranged, each pressure guiding pipe group comprises a plurality of second pressure guiding pipes, and the plurality of second pressure guiding pipes which are contained in each pressure guiding pipe group are circumferentially arranged. Compared with the prior art, more accurate static pressure and total pressure can be obtained in an icing wind tunnel test, so that more accurate total pressure recovery coefficient can be obtained, and the accuracy of pressure test measurement of an air inlet channel is improved.
Description
Technical Field
The invention relates to the technical field of measurement and test of air inlet channel pressure of an aviation aircraft, in particular to a pressure measuring rake, an air inlet channel pressure test device and a test method.
Background
The development of the icing problem research and the icing prevention and removal verification of the aeroengine is a necessary way for the flight safety guarantee of the aircraft, the icing wind tunnel test is used as a high-efficiency means for component-level icing exploration and icing prevention and removal verification, and the air inlet channel of the aeroengine component belongs to one of the most icing regions, so that the development of the air inlet channel icing wind tunnel test has great significance for the flight safety protection.
According to the icing wind tunnel test of the air inlet channel, icing simulation leads to shape change of the air inlet channel, and simulation air intake of the test causes a large amount of cloud mist to enter the inner channel, and for a target total pressure recovery coefficient of icing assessment, a plurality of pressure measuring devices are arranged in the circumferential direction of the inner channel to calculate the total pressure loss condition of the whole air inlet channel.
However, the existing icing wind tunnel test flow and pressure measurement mode have the problems of low test efficiency and low measurement accuracy.
Disclosure of Invention
The application aims to solve the technical problem of providing a pressure measuring rake, an air inlet channel pressure test device and a test method, and has the characteristic of being beneficial to higher measurement accuracy of the air inlet channel pressure test.
In a first aspect, an embodiment provides a pressure measurement rake for performing test measurement on pressure of an air inlet channel of an aircraft engine in an icing wind tunnel, including a rake body and a pressure guiding pipe, wherein the pressure guiding pipe includes a first pressure guiding pipe and a second pressure guiding pipe, and the first pressure guiding pipe and the second pressure guiding pipe are arranged on the rake body; one end of the first pressure guiding pipe and one end of the second pressure guiding pipe are used for being communicated with the external incoming flow direction of the air inlet channel, and the other end of the first pressure guiding pipe and the other end of the second pressure guiding pipe are communicated with the pressure measuring valve through the hollow pipeline so as to realize pressure measurement of incoming flow;
the first pressure guiding pipes comprise a plurality of pressure guiding pipes which are circumferentially arranged along the outermost circumference of the pressure measuring rake; the diameter of the outermost circumference is matched with the diameter of the inner side of the straight pipe section of the rear end pipeline of the air inlet channel model, so that when the pressure measuring rake is assembled in the straight pipe section of the rear end pipeline of the air inlet channel model, all the first pressure guiding pipes are arranged along the wall surface of the straight pipe section;
The second pressure guiding pipes comprise a plurality of pressure guiding pipe groups which are circumferentially arranged, each pressure guiding pipe group comprises a plurality of second pressure guiding pipes, and the plurality of second pressure guiding pipes which are contained in each pressure guiding pipe group are circumferentially arranged; the diameter of the circumference of each pressure guiding tube group is smaller than the diameter of the outermost circumference, and the diameters of the circumferences of the pressure guiding tube groups are different.
In one embodiment, the rake body includes a circumferential channel along which the first pressure tube is disposed.
In one embodiment, the rake body comprises a plurality of total pressure rakes which are arranged along the radial direction of the circumference of the pressure measuring rake, and each total pressure rake is provided with the same number of second pressure guiding pipes, and the diameters of the circumferences of the second pressure guiding pipes at the same position on the total pressure rake are the same.
In one embodiment, the plurality of first pressure inducing tubes are uniformly circumferentially arranged.
In one embodiment, the plurality of second pressure guiding pipes included in each pressure guiding pipe group are uniformly arranged along the circumference of the pressure guiding pipe group.
In a second aspect, an embodiment provides an air inlet pressure testing device, including a pressure testing rake according to any one of the embodiments above.
In a third aspect, an embodiment provides an air inlet pressure testing method, implemented based on the air inlet pressure testing device in any one of the foregoing embodiments, including:
the pressure measuring rake is arranged on the inner side of a straight pipe section of a pipeline at the rear end of the air inlet channel model;
The air inlet of the air inlet channel model is opposite to the incoming flow direction of the icing cloud in the icing wind tunnel;
simulating icing mist in the icing wind tunnel;
The pressure obtained by the pressure measuring valve corresponding to each first pressure guiding pipe is obtained, and the pressure obtained by the pressure measuring valve corresponding to each second pressure guiding pipe is obtained;
Calculating the total internal pressure of the air inlet channel based on the pressure corresponding to each first pressure guiding pipe and the pressure corresponding to each second pressure guiding pipe;
acquiring total external incoming flow pressure;
And calculating a total pressure recovery coefficient based on the total internal pressure and the total external incoming flow pressure of the air inlet channel.
In one embodiment, the calculating the total internal pressure of the air inlet based on the pressure corresponding to each first pressure guiding tube and the pressure corresponding to each second pressure guiding tube includes:
；
Wherein P in represents the total internal pressure of the air inlet, Represents the flow velocity coefficient, J represents the index of the pressure guiding tube group, J is more than or equal to 1 and less than or equal to J, J represents the number of the pressure guiding tube groups,；，Represents the pressure corresponding to any second pressure guiding tube m in the j-th pressure guiding tube group,Representing the average pressure corresponding to the pressure guiding pipe group j, wherein M is more than or equal to 1 and less than or equal to M, and M represents the number of second pressure guiding pipes in the pressure guiding pipe group; The pressure corresponding to any one first pressure guiding pipe I is represented, I is more than or equal to 1 and less than or equal to I, and I represents the number of the first pressure guiding pipes.
In one embodiment, the number of second pressure guiding pipes of each pressure guiding pipe group is equal to the number of first pressure guiding pipes.
In one embodiment, the calculating the total pressure recovery coefficient based on the total internal pressure and the total external incoming flow pressure of the air inlet includes:
；
Wherein, Representing the total pressure recovery coefficient, P in represents the total pressure inside the inlet, and P out represents the total pressure outside the inlet.
The beneficial effects of the invention are as follows:
based on a plurality of first pressure guiding pipes and a plurality of second pressure guiding pipes, wherein the first pressure guiding pipes and the second pressure guiding pipes are arranged on the inner wall of the straight pipe section of the rear end pipeline of the air inlet channel model, more accurate static pressure and total pressure can be obtained in an icing wind tunnel test, so that more accurate total pressure recovery coefficient can be obtained, and the accuracy of measurement of the air inlet channel pressure test is improved.
Drawings
FIG. 1 is a schematic diagram of an icing wind tunnel pressure test for an air inlet according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a pressure rake structure according to one embodiment of the application;
FIG. 3 is a schematic view of an air inlet pressure test device according to an embodiment of the present application;
FIG. 4 is a flow chart of an embodiment of a method for testing inlet pressure.
In the drawing, 100 denotes a pressure measurement rake, 200 denotes an air inlet model, 300 denotes frozen mist, 400 denotes a three-way valve, 500 denotes a pressure measurement valve, 600 denotes a controller, 700 denotes a shutoff valve, 800 denotes an air source, 900 denotes a regulating valve, 000 denotes a power source, 101 denotes a rake body, 1011 denotes a circumferential pipe, 1012 denotes a total pressure rake, 110 denotes a pressure introduction pipe, 102 denotes a first pressure introduction pipe, and 103 denotes a second pressure introduction pipe.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning.
In order to facilitate the description of the inventive concept, a brief description of the technique for measuring the pressure of the air inlet of an aircraft is provided below.
In the current test measurement mode, after icing is completed, a pressure measuring device is installed, a wind tunnel is operated to measure pressure, and the static measurement after icing is performed. The test is not only low in operation efficiency, but also has the risk of inaccurate secondary measurement.
In view of this, in the embodiment of the application, a pressure measurement rake, an air inlet channel pressure test device and a test method are provided, where the pressure measurement rake includes a plurality of first pressure guiding pipes and a plurality of second pressure guiding pipes, the plurality of first pressure guiding pipes are arranged on the inner wall of a straight pipe section of a pipeline at the rear end of an air inlet channel model, so as to obtain static pressure, and the plurality of second pressure guiding pipes are arranged in a plurality of circles, so as to obtain total pressure, thereby obtaining more accurate static pressure and total pressure in an icing wind tunnel test, obtaining more accurate total pressure recovery coefficient, and improving accuracy of measurement of the air inlet channel pressure test.
In order to clearly understand the solution of the present application, the pressure rake will be described first.
In one embodiment of the application, a pressure rake is provided for use in experimentally measuring aircraft engine inlet pressure in an icing wind tunnel. Referring to the assembly in fig. 1, the pressure measuring rake 100 is configured to be assembled in a straight pipe section of a rear end pipeline of the air inlet model 200, so as to measure the pressure of the air inlet under the condition that the icing wind tunnel simulates the icing cloud 300.
Referring to fig. 2, a pressure measuring rake 100 includes a rake body 101 and a pressure guiding tube 110, wherein the pressure guiding tube includes a first pressure guiding tube 102 and a second pressure guiding tube 103. The first pressure guiding pipe 102 and the second pressure guiding pipe 103 are arranged on the rake body 101. One end of the first pressure guiding pipe 102 and one end of the second pressure guiding pipe 103 are used for being communicated to the external incoming flow direction of the air inlet channel, and the other end of the first pressure guiding pipe is communicated to the pressure measuring valve through the hollow pipeline to achieve pressure measurement of incoming flow.
Wherein the first pressure guiding pipes 102 comprise a plurality of pressure guiding pipes which are circumferentially arranged along the outermost circumference of the pressure measuring rake 100. The diameter of the outermost circumference is matched with the diameter of the inner side of the straight pipe section of the rear end pipeline of the air inlet channel model, so that when the pressure measuring rake 100 is assembled in the straight pipe section of the rear end pipeline of the air inlet channel model, all the first pressure guiding pipes 102 are arranged along the wall surface of the straight pipe section. In this way, a measurement of the static pressure is achieved based on the first pressure guiding tube 102.
The second pressure guiding pipes 103 comprise a plurality of pressure guiding pipe groups which are circumferentially arranged, each pressure guiding pipe group comprises a plurality of second pressure guiding pipes 103, and the plurality of second pressure guiding pipes 103 which are included in each pressure guiding pipe group are circumferentially arranged; the diameter of the circumference of each pressure guiding tube group is smaller than the diameter of the outermost circumference, and the diameters of the circumferences of the pressure guiding tube groups are different. In this way, a measurement of the total pressure is achieved on the basis of the second pressure guiding tube 103.
In one embodiment, the rake body 101 includes a circumferential pipe 1011, and the first pressure guiding pipe 102 is disposed along the circumferential pipe 1011, so that when the circumferential pipe 1011 is matched with a straight pipe section of a rear end pipe of the air intake model, the first pressure guiding pipe 102 is disposed along a wall surface of the straight pipe section.
In one embodiment, the plurality of first pressure pipes 102 are uniformly circumferentially arranged to achieve uniform distribution measurement of static pressure. On the basis of the above-described circumferential duct 1011, in one embodiment, the plurality of first pressure guiding pipes 102 are uniformly arranged along the circumferential duct 1011.
In one embodiment, the first pressure inducing tubes 102 comprise 8, evenly arranged along the circumferential conduit 1011.
In one embodiment, the rake body 101 includes a total pressure rake 1012, the total pressure rake 1012 includes a plurality of pressure rake 1012, the pressure rake 1012 is arranged along the radial direction of the circumference of the pressure measuring rake 100, and each total pressure rake 1012 is provided with the same number of second pressure guiding pipes 103, and the diameters of the circumferences of the second pressure guiding pipes 103 at the same position on the total pressure rake 1012 are the same.
In this way, through the plurality of total pressure rakes 1012 arranged radially, the plurality of second pressure guiding pipes 103 are arranged on circumferences with different diameters, so that the plurality of second pressure guiding pipes 103 existing in pressure areas with different radiuses can be used for measuring the pressure of the pressure areas with different radiuses. And a plurality of second pressure guiding pipes 103 are also arranged in a plurality of sector areas formed by a plurality of total pressure rakes 1012 so as to measure the pressure of the sector areas.
In one embodiment, the total pressure rake 1012 includes 8, which are uniformly circumferentially arranged, i.e., each set of pressure tubes includes 8 second pressure tubes.
In one embodiment, 5 second pressure guiding pipes 103 are arranged on each total pressure rake 1012, namely, the total pressure rake includes 5 pressure guiding pipe groups.
In one embodiment, the plurality of second pressure guiding pipes 103 included in each pressure guiding pipe group are uniformly arranged along the circumference. So as to realize the uniform distribution measurement of dynamic pressure. On the basis of the total pressure rake 1012, in one embodiment, the total pressure rakes 1012 are uniformly arranged along the circumference, so that the second pressure guiding pipes 103 arranged along the length direction of the total pressure rake 1012 are uniformly arranged along different diameter directions.
Based on a plurality of first pressure guiding pipes and a plurality of second pressure guiding pipes, wherein the first pressure guiding pipes and the second pressure guiding pipes are arranged on the inner wall of the straight pipe section of the rear end pipeline of the air inlet channel model, more accurate static pressure and total pressure can be obtained in an icing wind tunnel test, so that more accurate total pressure recovery coefficient can be obtained, and the accuracy of measurement of the air inlet channel pressure test is improved.
The application provides an air inlet channel pressure test device, which comprises the pressure measuring rake in any one of the embodiments, so as to realize pressure measurement of an air inlet channel when an icing test is performed in an icing wind tunnel.
However, the applicant finds that due to the characteristic of total pressure measurement, the front face of the pressure measuring rake faces against incoming flow during measurement, and the frozen cloud and fog can directly impact the pressure measuring rake, so that the rake body and the pressure guiding pipe are easily frozen, and the pressure guiding pipe is blocked.
In view of this, in one embodiment, referring to fig. 3, the test apparatus further includes a three-way valve 400, and the test apparatus is configured to generate a high-pressure gas in the pressure guiding tube 110 opposite to the direction of the cloud air flow during the icing cloud test period by using the three-way valve 400, so as to avoid the blockage of the pressure guiding tube caused by the icing.
One end of any one pressure guiding pipe 110 is used for being communicated to the external incoming flow direction of the air inlet channel, and the other end is communicated to the pressure measuring valve 500 through the hollow pipeline to realize pressure measurement of incoming flow.
The three-way valve 400 includes a common port, which is opened when power is off, closed when power is on, and a normally-closed port, which is closed when power is off, and opened when power is on, correspondingly, the normally-closed port, which can be connected to the two circuits, and the common port is always kept in an open state.
In one embodiment of the present application, the three-way valve 400 includes a plurality of three-way valves, which are in one-to-one correspondence with the pressure guiding pipes 110. For any one of the three-way valves 400, the common end thereof is communicated with the other end of the pressure guiding pipe 110, the normally open end thereof is communicated with the pressure measuring valve 500, and the normally closed end thereof is communicated with the air supply circuit of the air source 800.
The controller 600 is configured to control the operating state of the three-way valve 400.
Based on the test device, the working state of the test device can be controlled based on the icing test condition of the icing wind tunnel, and the method comprises the following steps:
under the condition that icing cloud is simulated in the icing wind tunnel, the working state of the test device is controlled to be in a blowing state, and under the condition that icing cloud simulation is stopped in the icing wind tunnel, the working state of the test device is controlled to be in a pressure measuring state until the icing test is finished.
In the icing test of the whole icing wind tunnel, the simulation of icing cloud mist belongs to intermittent simulation. Therefore, the working state of the test device can be controlled to be in a blowing state in the simulated time period of icing mist, so that high-pressure gas with the opposite direction to the mist airflow is generated in the pressure guiding tube 110, the blockage of the pressure guiding tube 110 caused by icing is avoided, and the pressure measurement in the icing test process can be more conveniently carried out, so that the test efficiency and the measurement accuracy are improved.
Wherein, the operating condition of control test device is the state of blowing, includes: the three-way valve 400 is controlled to be electrified, so that the normally open end of the three-way valve 400 is closed, the normally closed end is opened, and the loop where the pressure guiding pipe 110 is positioned is switched from the pressure measuring loop to the air source loop. The working state of the control test device is a pressure measurement state, and the control test device comprises: the three-way valve 400 is controlled to be powered off, so that the normally open end of the three-way valve 400 is opened, the normally closed end is closed, and the loop where the pressure guiding pipe 110 is located is switched from the air source loop to the pressure measuring loop.
As will be appreciated by those skilled in the art, if the initial operating state of the test device is a pressure-measuring state, then the initial operating state is free of a gas source circuit switched from the pressure-measuring circuit.
The applicant has also found in the study that, although the pressure measurement circuit is in a closed state in the blowing state, if a blow-by occurs, the high pressure gas of the gas source 800 easily impacts the pressure measurement valve 500, causing damage to the pressure measurement valve 500 under high pressure top blowing.
In view of this, in one embodiment, the test device further comprises a shut-off valve 700, which shut-off valve 700 is provided between the air source 800 and the three-way valve 400 for controlling the opening or closing of the passage between the air source 800 and the three-way valve 400.
Based on the test device including the shut-off valve 700, in one embodiment, controlling the operation state of the test device to be the blowing state further includes: after the three-way valve 400 is controlled to be electrified, the air source 800 is opened, then the stop valve 700 is opened, the first pressure measured by the pressure measuring valve 500 is obtained in real time in the blowing state, and if the first pressure is greater than or equal to a preset first pressure threshold value, the stop valve 700 and/or the air source 800 are/is closed.
In the blowing state, since the normal open end is in the closed state, when the pressure measured by the pressure measuring valve 500 should be the ambient pressure inside the air inlet or the static pressure inside the air inlet when there is no icing cloud, a reference pressure can be obtained based on the ambient pressure inside the air inlet or the static pressure inside the air inlet when there is no icing cloud, and a pressure which is greater than or equal to the reference pressure and is lower than the pressure measuring range of the pressure measuring valve 500 is set as a preset first pressure threshold. For example, two-thirds of the range of the pressure measurement valve 500 may be taken as the preset first pressure threshold. It will be appreciated by those skilled in the art that the preset first pressure threshold may be set based on actual requirements, and the specific setting value does not limit the protection scope of the present application.
In the blowing state, if the first pressure measured by the pressure measuring valve 500 is greater than or equal to the preset first pressure threshold, it indicates that there is top blowing of the pressure measuring valve by high-pressure blowing, and the top blowing easily causes damage to the pressure measuring valve 500, so that the shut-off valve 700 and/or the air source 800 are closed to avoid causing unnecessary loss and affecting the test efficiency.
In one embodiment, the test device further comprises a second pressure sensor disposed between gas source 800 and shut-off valve 700, and a regulator valve 900 disposed between gas source 800 and the second pressure sensor. The regulator valve 900 regulates the pressure between the shut-off valve 700 and the air source 800 to a preset pressure range in a state where the air source 800 is in communication with the pressure introduction pipe 110 based on feedback of the second pressure sensor.
Based on the basis that the stop valve 700, the second pressure sensor and the regulating valve 900 are included, in one embodiment, controlling the working state of the test device to be the blowing state further includes: and acquiring the third pressure measured by the second pressure sensor in real time, and controlling the regulating valve 900 to regulate the air source pressure until the third pressure is within a preset pressure range if the third pressure exceeds the preset pressure range, including being lower than the lower limit value of the pressure range or being higher than the upper limit value of the pressure range.
In this way, the blowing pressure is ensured to reach the working pressure, and the pressure is ensured not to be high so as to damage the pressure measuring valve 500.
In one embodiment, the predetermined pressure may be in the range of 0.6mpa to 1mpa.
The applicant also found in the study that when the working state of the test device is switched from the blowing state to the pressure measuring state, if the three-way valve 400 is directly controlled to be powered off to realize the switching, at this time, since the gas source circuit still has high-pressure gas, if the high-pressure gas leaks, the high-pressure gas is easily caused to top-blow to the pressure measuring valve 500, so that the pressure measuring valve 500 is damaged.
In view of this, the test device further comprises a first pressure sensor arranged in the gas supply circuit between the shut-off valve 700 and the three-way valve 400. The controller 600 is further configured to: a second pressure measured by the first pressure sensor is obtained.
Based on the test device including the stop valve 700 and the first pressure sensor, in one embodiment, the operation state of the test device is controlled to be a pressure measurement state, further including: the control shut valve 700 is closed before the control three-way valve 400 is de-energized. After the stop valve 700 is closed, the second pressure measured by the first pressure sensor is obtained in real time, and if the second pressure is smaller than a preset second pressure threshold value, the three-way valve 400 is controlled to be powered off.
After the stop valve 700 is closed, the second pressure measured by the first pressure sensor is obtained in real time, so that on one hand, whether the gas source leaks out can be judged, and on the other hand, whether the current pressure can be too high to cause leakage out of the three-way valve 400, so that top blowing of the pressure measuring valve 500 is caused to cause damage to the pressure measuring valve 500, and the safety of the pressure measuring valve 500 is further ensured.
In one embodiment, the second pressure threshold may be set to the same value as the first pressure threshold, or may be different.
In addition, due to the characteristic of pressure measurement, the pressure measuring harrow 100 is opposite to incoming flow, in the test, the frozen cloud and fog can directly impact the pressure measuring harrow 100, so that the harrow body and each pressure guiding pipe 110 are easily frozen, and the harrow body is easily frozen and extended.
In view of this, in one embodiment, an electric heating device is disposed on the rake body, and the electric heating device is connected to the power supply 000 to heat the rake body, so as to implement anti-icing protection for the rake body and the pressure guiding tube on the rake body. In one embodiment, the rake temperature is raised above 0 degrees celsius to avoid ice formation extension. Meanwhile, the temperature is conducted to the pressure guiding pipe 110 (including the first pressure guiding pipe 102 and the second pressure guiding pipe 103), so that the temperature of the pressure guiding pipe is higher than 0 ℃ and icing in the pressure guiding pipe is avoided.
An embodiment of the present application provides an air inlet pressure test method, which is implemented based on the air inlet pressure test device in any one of the embodiments, referring to fig. 4, and includes:
and S10, arranging a pressure measuring rake on the inner side of a straight pipe section of a rear end pipeline of the air inlet channel model.
The purpose of the pressure measurement of the icing wind tunnel test of the air inlet channel is to obtain the total pressure recovery coefficient of the icing of the air inlet channel, wherein the total pressure recovery coefficient characterizes the air inlet condition of the air inlet channel, namely the influence of the icing on the air inlet, and the higher the coefficient is, the better the flow of the air inlet is, and the maximum value of the coefficient is 1. The total pressure recovery coefficient is calculated according to total pressure and static pressure distributed in the circumferential space of the straight pipe section of the air inlet rear-end pipeline.
And S20, enabling an air inlet of the air inlet channel model to face the incoming flow direction of the icing cloud in the icing wind tunnel.
And the air inlet of the air inlet channel model is opposite to the incoming flow direction of the frozen mist in the icing wind tunnel, so that the frozen mist directly impacts the pressure measuring rake.
Step S30, simulating icing mist in the icing wind tunnel.
And S40, acquiring the pressure obtained by the pressure measuring valve corresponding to each first pressure guiding pipe, and acquiring the pressure obtained by the pressure measuring valve corresponding to each second pressure guiding pipe.
In the process, the rake body can be heated, so that the temperature of the rake body is above 0 ℃, and anti-icing protection is realized.
Step S50, calculating the total internal pressure of the air inlet channel based on the pressure corresponding to each first pressure guiding pipe and the pressure corresponding to each second pressure guiding pipe.
In one embodiment, step S50 includes:
；
Wherein P in represents the total internal pressure of the air inlet, Represents the flow velocity coefficient, J represents the index of the pressure guiding tube group, J is more than or equal to 1 and less than or equal to J, J represents the number of the pressure guiding tube groups,；，Represents the pressure corresponding to any second pressure guiding tube m in the j-th pressure guiding tube group,Representing the average pressure corresponding to the pressure guiding pipe group j, wherein M is more than or equal to 1 and less than or equal to M, and M represents the number of second pressure guiding pipes in the pressure guiding pipe group; The pressure corresponding to any one first pressure guiding pipe I is represented, I is more than or equal to 1 and less than or equal to I, and I represents the number of the first pressure guiding pipes.
In one embodiment, the number of second pressure guiding pipes of each pressure guiding pipe group is equal to the number of first pressure guiding pipes.
In one embodiment, please refer to the embodiment of fig. 2, m=i= 8,J =5.
Step S60, obtaining the total pressure of the external incoming flow.
For the total external incoming flow pressure, the total external incoming flow pressure can be obtained based on test parameters of the icing wind tunnel.
Step S70, calculating a total pressure recovery coefficient based on the total pressure inside the air inlet and the total pressure of the external incoming flow.
In one embodiment, step S70 includes:
；
Wherein, Representing the total pressure recovery coefficient, P in represents the total pressure inside the inlet, and P out represents the total pressure outside the inlet.
In one embodiment of the present application, a computer readable storage medium is provided, on which a program is stored, the stored program including an air intake pressure test method that can be loaded by a processor and processed in any of the above embodiments.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (9)
1. The pressure test device for the air inlet channel is characterized by comprising a pressure measuring rake, a controller and a three-way valve; the pressure measuring rake is used for carrying out test measurement on the pressure of an air inlet channel of an aircraft engine in an icing wind tunnel and comprises a rake body and pressure guiding pipes, wherein the pressure guiding pipes comprise a first pressure guiding pipe and a second pressure guiding pipe, and the first pressure guiding pipe and the second pressure guiding pipe are arranged on the rake body; one end of the first pressure guiding pipe and one end of the second pressure guiding pipe are used for being communicated with the external incoming flow direction of the air inlet channel, and the other end of the first pressure guiding pipe and the other end of the second pressure guiding pipe are communicated with the pressure measuring valve through the hollow pipeline so as to realize pressure measurement of incoming flow;
the first pressure guiding pipes comprise a plurality of pressure guiding pipes which are circumferentially arranged along the outermost circumference of the pressure measuring rake; the diameter of the outermost circumference is matched with the diameter of the inner side of the straight pipe section of the rear end pipeline of the air inlet channel model, so that when the pressure measuring rake is assembled in the straight pipe section of the rear end pipeline of the air inlet channel model, all the first pressure guiding pipes are arranged along the wall surface of the straight pipe section;
the second pressure guiding pipes comprise a plurality of pressure guiding pipe groups which are circumferentially arranged, each pressure guiding pipe group comprises a plurality of second pressure guiding pipes, and the plurality of second pressure guiding pipes which are contained in each pressure guiding pipe group are circumferentially arranged; the diameter of the circumference of each pressure guiding tube group is smaller than the diameter of the outermost circumference, and the diameters of the circumferences of the pressure guiding tube groups are different;
the three-way valves comprise a plurality of three-way valves which are in one-to-one correspondence with the pressure guiding pipes, and the controller is configured to control the working state of the three-way valves; for any three-way valve, the common end of the three-way valve is communicated with the other end of the pressure guiding pipe, the normally open end of the three-way valve is communicated with the pressure measuring valve, and the normally closed end of the three-way valve is communicated with the air source loop;
The test device further comprises a stop valve, a first pressure sensor, a second pressure sensor and a regulating valve; the stop valve is arranged between the air source and the three-way valve and is used for controlling the opening or closing of a passage between the air source and the three-way valve; the controller is further configured to obtain a first pressure measured by the pressure measuring valve, and if the first pressure is greater than or equal to a preset first pressure threshold value, the controller controls the stop valve to close a passage between the air source and the three-way valve and/or close the air source;
The first pressure sensor is arranged in an air source loop between the stop valve and the three-way valve; the controller is further configured to: acquiring a second pressure measured by the first pressure sensor; the controller is further configured to control the shut-off valve to close before the three-way valve is controlled to be powered off; after the stop valve is closed, acquiring a second pressure measured by the first pressure sensor in real time, and if the second pressure is smaller than a preset second pressure threshold value, controlling the three-way valve to be powered off;
The second pressure sensor is arranged between the air source and the cut-off valve, and the regulating valve is arranged between the air source and the second pressure sensor; the regulating valve is used for regulating the pressure between the stop valve and the air source to a preset pressure range under the state that the air source is communicated with the pressure guiding pipe based on feedback of the second pressure sensor.
2. The inlet pressure test apparatus of claim 1, wherein the rake body includes a circumferential channel along which the first pressure tube is disposed.
3. The inlet duct pressure test device of claim 1, wherein the rake body comprises a plurality of total pressure rakes which are arranged along the radial direction of the circumference of the pressure measuring rake, and each total pressure rake is provided with the same number of second pressure guiding pipes, and the diameters of the circumferences of the second pressure guiding pipes at the same position on the total pressure rake are the same.
4. A port pressure test assembly according to claim 1 or 3, wherein the plurality of first pressure pipes are circumferentially and uniformly arranged.
5. The inlet pressure test apparatus of claim 1, wherein each of the plurality of pressure guiding tubes comprises a plurality of second pressure guiding tubes uniformly arranged along a circumference thereof.
6. An air inlet channel pressure test method, which is realized based on the air inlet channel pressure test device as claimed in claim 1, and comprises the following steps:
the pressure measuring rake is arranged on the inner side of a straight pipe section of a pipeline at the rear end of the air inlet channel model;
The air inlet of the air inlet channel model is opposite to the incoming flow direction of the icing cloud in the icing wind tunnel;
simulating icing mist in the icing wind tunnel;
The pressure obtained by the pressure measuring valve corresponding to each first pressure guiding pipe is obtained, and the pressure obtained by the pressure measuring valve corresponding to each second pressure guiding pipe is obtained;
Calculating the total internal pressure of the air inlet channel based on the pressure corresponding to each first pressure guiding pipe and the pressure corresponding to each second pressure guiding pipe;
acquiring total external incoming flow pressure;
calculating a total pressure recovery coefficient based on the total internal pressure and the total external incoming flow pressure of the air inlet channel;
the test method further comprises the following steps: based on the icing test condition of the icing wind tunnel, controlling the working state of the test device, comprising:
Under the condition that icing cloud is simulated in the icing wind tunnel, controlling the working state of the test device to be a blowing state, and under the condition that icing cloud simulation is stopped in the icing wind tunnel, controlling the working state of the test device to be a pressure measuring state until the icing test is finished;
the working state of the control test device is an air blowing state, and the control test device comprises:
The three-way valve is controlled to be electrified, so that the normally open end of the three-way valve is closed, the normally closed end of the three-way valve is opened, and a loop in which the pressure guiding pipe is positioned is switched from the pressure measuring loop to the air source loop;
the working state of the control test device is a pressure measurement state, and the control test device comprises:
the three-way valve is controlled to be powered off, so that the normally open end of the three-way valve is opened, the normally closed end of the three-way valve is closed, and a loop in which the pressure guiding pipe is positioned is switched from an air source loop to a pressure measuring loop;
the working state of the control test device is an air blowing state and further comprises:
after the three-way valve is controlled to be electrified, firstly opening an air source and then opening a stop valve;
And acquiring the first pressure measured by the pressure measuring valve in real time, and closing the stop valve and/or the air source if the first pressure is greater than or equal to a preset first pressure threshold value.
7. The method of claim 6, wherein calculating the total internal pressure of the intake duct based on the pressure corresponding to each first pressure guiding tube and the pressure corresponding to each second pressure guiding tube, comprises:
；
Wherein P in represents the total internal pressure of the air inlet, Represents the flow velocity coefficient, J represents the index of the pressure guiding tube group, J is more than or equal to 1 and less than or equal to J, J represents the number of the pressure guiding tube groups,；，Represents the pressure corresponding to any second pressure guiding tube m in the j-th pressure guiding tube group,Representing the average pressure corresponding to the pressure guiding pipe group j, wherein M is more than or equal to 1 and less than or equal to M, and M represents the number of second pressure guiding pipes in the pressure guiding pipe group; The pressure corresponding to any one first pressure guiding pipe I is represented, I is more than or equal to 1 and less than or equal to I, and I represents the number of the first pressure guiding pipes.
8. The method of claim 6, wherein the number of second pressure pipes of each pressure pipe group is equal to the number of first pressure pipes.
9. The method of claim 6, wherein calculating a total pressure recovery coefficient based on the total internal pressure and the total external incoming flow pressure of the intake passage comprises:
；
Wherein, Representing the total pressure recovery coefficient, P in represents the total pressure inside the inlet, and P out represents the total pressure outside the inlet.
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| CN101813554A (en) * | 2010-03-29 | 2010-08-25 | 南京航空航天大学 | Air inlet experimental facility capable of carrying out measurement on the same model and operating method thereof |
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| CN201688962U (en) * | 2010-03-29 | 2010-12-29 | 南京航空航天大学 | Air inlet duct testing device capable of measuring on same model |
| CN104848904B (en) * | 2015-06-05 | 2018-08-07 | 中国航天空气动力技术研究院 | Inlet duct flow system for measuring quantity |
| CN105181292A (en) * | 2015-09-25 | 2015-12-23 | 中国航空工业集团公司哈尔滨空气动力研究所 | Multi-measuring range pressure measurement device with purging function |
| CN105300459B (en) * | 2015-11-26 | 2018-07-31 | 山东钢铁股份有限公司 | Automatically cleaning flow detector |
| CN105675067A (en) * | 2016-04-22 | 2016-06-15 | 南京友智科技有限公司 | Circular pipeline full-area flow meter |
| CN213932699U (en) * | 2020-12-30 | 2021-08-10 | 西安众科流体技术有限公司 | Fine tuning type micro-positive pressure anti-blocking guarantee device |
| CN113125103B (en) * | 2021-03-24 | 2023-02-17 | 中国空气动力研究与发展中心空天技术研究所 | Data processing method for 41 measuring point equidistantly distributed oval cross-section flow meter |
| CN113405763B (en) * | 2021-06-11 | 2022-11-29 | 中国空气动力研究与发展中心空天技术研究所 | Measuring point arrangement method of '3 +4+ 5' rice-shaped harrow flow meter |
| CN115014450A (en) * | 2022-05-31 | 2022-09-06 | 国能浙江舟山发电有限责任公司 | Air volume measuring method and device, readable medium and electronic equipment |
| CN116577107A (en) * | 2023-04-20 | 2023-08-11 | 成都飞机工业（集团）有限责任公司 | Parallel double-S-bend air inlet channel performance measuring method and correcting method |
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