A flow measurement system and method for a dual-duct compression component

Abstract

The present invention relates to the technical field of dual-duct aero-engine compression component testing, and discloses a dual-duct compression component flow measurement system and method. The system comprises the following steps: exhausting the inner and outer ducts of the dual-duct compression component separately, arranging a pressure probe in the outer duct exhaust pipe connected to the outer duct flow channel of a compression component tester, and arranging a flow meter in the inner duct exhaust pipe connected to the inner flow channel of a compression component test piece; arranging a flow tube at the front end of a first airflow duct connecting an air intake chamber and a pressure stabilizing box, judging the airtightness performance of the dual-duct compression component flow measurement system based on the relationship between a first flow value of the flow tube, a second flow of the flow meter, and a third flow converted by the pressure probe, and finally outputting a flow test value that meets the airtightness requirements, thereby ensuring accurate measurement of test data and improving the reliability of the test data, thereby providing support for subsequent dual-duct aero-engine whole-machine testing and component optimization.

Description

Technical Field

[0001] The invention relates to the technical field of dual-ducted aero-engine compression component testing, and discloses a dual-ducted compression component flow measurement system and method. Background Art

[0002] To investigate the performance of dual-ducted aircraft engines, relevant testing is essential. Flow measurement of the dual-ducted fan / compressor, a key engine component, is crucial during the test verification process. The structural design of the intake system, the sealing method of the test system, and the accuracy of the flow measurement device all directly affect the test data, and thus the performance evaluation of the dual-ducted aircraft engine.

[0003] For dual-ducted test pieces, the high intake airflow makes leakage at the joints with the test piece extremely likely, making good sealing at both the front and rear ends crucial. Separate exhaust flows into the inner and outer ducts at the test piece outlet further complicate sealing. Furthermore, high exhaust temperatures and significant test piece vibration during testing can affect the sealing, leading to system leaks and inaccurate test data collection. Summary of the Invention

[0004] The object of the present invention is to provide a flow measurement system and method for a dual-duct compression component, which can ensure accurate measurement of test data and improve the reliability of the test data.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0006] A double-ducted compression component flow measurement system, comprising:

[0007] an air inlet chamber, the air inlet chamber being used to provide a test air flow;

[0008] a pressure stabilizing box, the inlet end of which is in communication with the outlet end of the air inlet chamber via a first airflow duct, the inlet end of the first airflow duct being provided with a flow tube for measuring the flow rate of air entering the first airflow duct;

[0009] A compression component test piece, wherein the compression component test piece is a double-duct structure having an inner flow channel and an outer flow channel, and the compression component test piece is connected to the outlet end of the pressure regulating box through a second air flow duct;

[0010] An exhaust volute is provided with an outer exhaust channel and an inner exhaust channel, wherein the outer exhaust channel is connected to the outlet end of the outer flow channel, and the inner exhaust channel is connected to the outlet end of the inner flow channel;

[0011] An exhaust pipe, comprising an outer exhaust pipe and an inner exhaust pipe, wherein the inner exhaust pipe is connected to the inner exhaust channel and a flow meter is provided in the inner exhaust pipe; the outer exhaust pipe is connected to the outer exhaust channel and a pressure probe is provided in the outer exhaust pipe;

[0012] A power drive system is used to drive the internal rotor of the compression component test piece to rotate.

[0013] Furthermore, the exhaust volute is respectively provided with sealing grooves at positions corresponding to the outer surface outlet end of the outer duct, the outer surface outlet end of the inner duct, and the inner surface outlet end of the inner duct, and the inner surface outlet end of the outer duct, the outer surface outlet end of the inner duct, and the inner surface outlet end of the inner duct are respectively inserted into the corresponding sealing grooves, and the axial clearance between the inner surface outlet end of the outer duct, the outer surface outlet end of the inner duct, and the inner surface outlet end of the inner duct and the axial bottom surface of the corresponding sealing groove is greater than or equal to a preset spacing threshold, and the preset spacing threshold is based on The analysis obtained is the preset spacing threshold, is the test safety factor, The value range is 1.1 to 1.5. is the expansion coefficient of the compression component test piece, is the initial axial length of the compression component test piece, is the difference between the temperature of the compression component test piece under the test conditions and the room temperature, is the vibration frequency of the compression component test piece during the test, is the vibration acceleration, is the axial force on the compression component test piece during the test, is the elastic modulus of the material used for the compression component test piece, is the cross-sectional area of ​​the transmission shaft of the compression component test piece.

[0014] Furthermore, an annular asbestos packing is provided between the inner outlet end of the outer duct, the outer outlet end of the inner duct, the inner outlet end of the inner duct and the axial bottom surface of the corresponding sealing groove. A spring is provided between the asbestos packing and the axial bottom surface of the corresponding sealing groove. The elastic force of the spring is greater than the friction force between the asbestos packing and the upper and lower walls of the sealing groove when the asbestos packing is fully sealed. The elastic coefficient of the spring has a value range of ,in Preload force The axial displacement of the compression component test piece is caused by is the thickness of the asbestos packing, The value range is , is the contact surface width between the asbestos packing and the sealing groove, is the friction coefficient between the asbestos packing and the sealing groove, is the elastic coefficient of asbestos packing, is the radial height of the sealing groove.

[0015] Furthermore, the air inlet chamber includes a horizontal section and a vertical section, and the horizontal section is connected to the vertical section; the outlet end of the air inlet chamber is arranged at the end of the horizontal section away from the vertical section; the air inlet chamber is provided with a guide vane at the corner connection between the horizontal section and the vertical section, and the guide vane includes a plurality of arc guide blades arranged evenly at intervals.

[0016] Furthermore, the chord length of the guide blades ranges from 1.3 to 1.5 m, the number of guide blades ranges from 8 to 10, the pitch ranges from 0.6 to 0.7 m, and the tiling angle of the guide blades ranges from 40° to 45°.

[0017] Furthermore, a rectifying net is provided in the horizontal section, and the rectifying net is provided at a downstream position of the guide vane.

[0018] Furthermore, the inlet end of the first air flow duct is provided with an expansion section with a smoothly increasing diameter, the end of the expansion section close to the air inlet chamber extends into the air inlet chamber and is coaxially connected to the flow tube, and the circumferential position where the outer wall of the expansion section contacts the air inlet chamber is provided with a rubber sealing plate.

[0019] To achieve the above technical effects, the present invention further provides a dual-duct compression component flow measurement method, which is based on the dual-duct compression component flow measurement system, and includes:

[0020] Start the power drive system to drive the rotor inside the compression component test piece to rotate;

[0021] After the flow tube measurement data at the inlet end of the first air flow tube is stable, a first flow value of the flow tube is read, and a second flow value of the flow meter in the inner exhaust pipe and a pressure value of the pressure measuring probe in the outer exhaust pipe are read respectively;

[0022] According to the pressure value of the pressure measuring probe, a third flow rate in the outer exhaust pipe is obtained by analyzing the flow rate formula;

[0023] If the first flow value data is the sum of the second flow and the third flow, the first flow data is output as the flow test value of the dual-duct compression component. Otherwise, the airtight performance of the dual-duct compression component flow measurement system is checked until the first flow value data is the sum of the second flow and the third flow, and then the first flow data is output as the flow test value of the dual-duct compression component.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention exhausts the inner and outer ducts of the dual-duct compression component separately, and sets a pressure probe in the outer duct exhaust pipe connected to the outer duct flow channel of the compression component tester, and sets a flow meter in the inner duct exhaust pipe connected to the inner flow channel of the compression component test piece; a flow tube is set at the front end of the first airflow duct connecting the air intake chamber and the pressure stabilizing box, and the airtightness performance of the dual-duct compression component flow measurement system is judged according to the relationship between the first flow value of the flow tube, the second flow of the flow meter and the third flow converted by the pressure probe, and finally outputs a flow test value that meets the airtightness requirements, ensuring the accurate measurement of the test data and improving the reliability of the test data, thereby providing support for subsequent dual-duct aircraft engine whole machine testing and component optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the flow measurement system of the double-duct compression component in the embodiment;

[0026] Figure 2 Schematic diagram of the connection between the compression component test piece and the exhaust turbine in the embodiment;

[0027] Figure 3 Schematic diagram of the connection between the air inlet chamber and the expansion section in the embodiment;

[0028] Among them, 1. Air intake chamber; 2. Pressure stabilizing box; 3. First air flow duct; 301. Expansion section; 4. Flow tube; 5. Compression component test piece; 501. Inner flow channel; 502. Outer flow channel; 6. Second air flow duct; 7. Exhaust volute; 701. Outer exhaust channel; 702. Inner exhaust channel; 703. Sealing groove; 8. Outer exhaust pipe; 9. Inner exhaust pipe; 10. Flow meter; 11. Pressure probe; 12. Power drive system; 13. Asbestos packing; 14. Spring; 15. Guide vane; 16. Rectifier net; 17. Rubber sealing plate. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0030] Example

[0031] See also Figure 1-Figure 3 , a double-ducted compression component flow measurement system, comprising:

[0032] An air inlet chamber 1, wherein the air inlet chamber 1 is used to provide a test airflow;

[0033] A pressure stabilizing box 2, the inlet end of which is connected to the outlet end of the air inlet chamber 1 through a first airflow pipe 3, and a flow tube 4 is provided at the inlet end of the first airflow pipe, and the flow tube 4 is used to measure the airflow rate entering the first airflow pipe 3;

[0034] A compression component test piece 5, wherein the compression component test piece 5 is a double-duct structure having an inner flow channel 501 and an outer flow channel 502, and the compression component test piece 5 is connected to the outlet end of the pressure stabilizing tank 2 through a second air flow duct 6;

[0035] The exhaust volute 7 is provided with an outer exhaust passage 701 and an inner exhaust passage 702, wherein the outer exhaust passage 701 is communicated with the outlet end of the outer flow passage 502, and the inner exhaust passage 702 is communicated with the outlet end of the inner flow passage 501;

[0036] The exhaust pipe includes an outer exhaust pipe 8 and an inner exhaust pipe 9. The inner exhaust pipe 9 is connected to the inner exhaust channel 702 and a flow meter 10 is provided in the inner exhaust pipe 9. The outer exhaust pipe 8 is connected to the outer exhaust channel 701 and a pressure probe 11 is provided in the outer exhaust pipe 8.

[0037] The power drive system 12 is used to drive the internal rotor of the compression component test piece 5 to rotate.

[0038] In this embodiment, the operation method of the dual-duct compression component flow measurement system is as follows:

[0039] Start the power drive system 12 to drive the internal rotor of the compression component test piece 5 to rotate;

[0040] After the measurement data of the flow tube 4 at the inlet end of the first air flow pipe stabilizes, read the first flow value of the flow tube 4, and read the second flow value of the flow meter 10 in the inner exhaust pipe 9 and the pressure value of the pressure probe 11 in the outer exhaust pipe 8 respectively;

[0041] According to the pressure value of the pressure measuring probe 11, a third flow rate in the outer exhaust pipe 8 is obtained by analyzing the flow rate formula;

[0042] If the first flow value data is the sum of the second flow and the third flow, the first flow data is output as the flow test value of the dual-duct compression component. Otherwise, the airtight performance of the dual-duct compression component flow measurement system is checked until the first flow value data is the sum of the second flow and the third flow, and then the first flow data is output as the flow test value of the dual-duct compression component.

[0043] In this embodiment, the inner and outer ducts of the dual-duct compression component are exhausted separately, and a pressure probe 11 is set in the outer duct exhaust pipe 8 connected to the outer duct flow channel 502 of the compression component tester, and a flow meter 10 is set in the inner duct exhaust pipe 9 connected to the inner duct 501 of the compression component test piece 5; a flow tube 4 is set at the front end of the first airflow duct 3 connecting the air intake chamber 1 and the pressure stabilizing box 2, and the airtightness performance of the dual-duct compression component flow measurement system is judged according to the relationship between the first flow value of the flow tube 4, the second flow of the flow meter 10 and the third flow converted by the pressure probe 11, and finally the flow test value that meets the airtightness requirements is output, thereby ensuring the accurate measurement of the test data and improving the reliability of the test data, thereby providing support for subsequent dual-duct aircraft engine whole machine testing and component optimization.

[0044] During the installation of the compression component test piece 5 on the platform, an axial gap needs to be reserved between the compression component test piece 5 and the exhaust volute 7; if the gap is too large, the sealing effect is poor, resulting in inaccurate flow measurement; if the gap is too small, friction will occur between the test piece and the tester, causing damage. In this embodiment, the exhaust volute 7 is provided with sealing grooves 703 at positions corresponding to the inner surface outlet end of the outer duct 502, the outer surface outlet end of the inner duct 501, and the inner surface outlet end of the inner duct 501, respectively. The inner surface outlet end of the outer duct 502, the outer surface outlet end of the inner duct 501, and the inner surface outlet end of the inner duct 501 are respectively inserted into the corresponding sealing grooves 703, and the axial gap between the inner surface outlet end of the outer duct 502, the outer surface outlet end of the inner duct 501, the inner surface outlet end of the inner duct 501 and the axial bottom surface of the corresponding sealing groove 703 is greater than or equal to a preset spacing threshold, and the preset spacing threshold is based on The analysis obtained is the preset spacing threshold, is the test safety factor, The value range is 1.1 to 1.5. is the expansion coefficient of the compression component test piece 5, is the initial axial length of the compression component test piece, is the difference between the temperature of the compression component test piece 5 under the test conditions and the room temperature, is the vibration frequency of the compression component test piece 5 during the test, is the vibration acceleration, is the axial force applied to the compression component test piece 5 during the test, is the elastic modulus of the material used for the compression component test piece 5, is the cross-sectional area of ​​the transmission shaft of compression component test piece 5.

[0045] In addition, an annular asbestos packing 13 is provided between the inner surface outlet end of the outer duct 502, the outer surface outlet end of the inner duct 501, the inner surface outlet end of the inner duct 501 and the axial bottom surface of the corresponding sealing groove 703, and a spring 14 is provided between the asbestos packing 13 and the axial bottom surface of the corresponding sealing groove 703.

[0046] The maximum compression T of spring 14 must meet the following requirements: T> + Lmax, that is, the deformation of the spring when the asbestos packing 13 is completely sealed The maximum value of the preset distance threshold during the test Selection of asbestos packing 13: When the asbestos packing 13 is completely sealed, ensure that the contact surface width between the asbestos packing 13 and the sealing groove 703 is Greater than D / 2, the cross section of the asbestos packing 13 is compressed into a rectangle. , so the thickness diameter D of asbestos packing 13 ranges from Therefore, the elastic force of the spring 14 is greater than the friction between the asbestos packing 13 and the upper and lower walls of the sealing groove 703 when the asbestos packing 13 is completely sealed, thereby preventing the asbestos packing 13 from getting stuck; and is less than the pre-compression force when the asbestos packing 13 is completely sealed. , to prevent the asbestos packing 13 from being damaged, the elastic coefficient of the spring 14 is in the range of ,in Preload force The axial displacement of the compression component test piece is caused by is the thickness of the asbestos packing 13, The value range is , is the contact surface width between the asbestos packing 13 and the sealing groove 703, is the friction coefficient between the asbestos packing 13 and the sealing groove 703, is the elastic coefficient of asbestos packing 13, is the radial height of the sealing groove 703.

[0047] In this embodiment, the pre-compression force is applied when the test piece is installed. The retaining ring on the test piece is used to press the asbestos packing 13 to ensure complete sealing. The axial displacement of the retaining ring can be measured and a characteristic curve of the pre-compression force and the axial displacement can be generated on the computer through the data acquisition system. When the pre-compression force is continuously increased to When the axial displacement stops changing, it means the packing is fully compacted and the cross section changes from a circle to a rectangle. The corresponding axial displacement value is .

[0048] When the air inlet chamber 1 is placed horizontally, it can not only reduce the pressure loss of the air flow caused by the curved flow channel in the pipeline, but also avoid turbulence of the air flow at the corners of the pipeline, thereby making the incoming flow more stable. However, a single horizontal air inlet chamber 1 will require too large a horizontal distance of the air inlet chamber 1, resulting in poor system structure. Therefore, the air inlet chamber 1 described in this embodiment includes a horizontal section and a vertical section, and the horizontal section is connected to the vertical section; the outlet end of the air inlet chamber 1 is arranged at the end of the horizontal section away from the vertical section; the air inlet chamber 1 is provided with a guide vane 15 at the corner connection between the horizontal section and the vertical section, and the guide vane 15 includes a plurality of evenly spaced arc guide blades, which save space by adopting a radial layout while achieving a large flow of air intake.

[0049] In this embodiment, the guide vane chord length ranges from 1.3 to 1.5 meters, the number of guide vanes ranges from 8 to 10, the pitch ranges from 0.6 to 0.7 meters, and the guide vane flattening angle ranges from 40° to 45°. This can effectively improve the eccentricity of the airflow and make the inlet more uniform.

[0050] In this embodiment, a rectifier net 16 is provided in the horizontal section, and the rectifier net 16 is provided downstream of the guide vane 15. The rectifier net 16 not only makes the incoming flow velocity distribution more uniform, but also filters out impurities in the intake air, thus meeting the test intake requirements.

[0051] In this embodiment, the inlet end of the first airflow duct 3 is provided with an expansion section 301 with a smoothly increasing diameter. The expansion section 301, located near the end of the inlet chamber 1, extends into the inlet chamber 1 and is coaxially connected to the flow tube 4. A rubber sealing plate 17 is provided circumferentially where the outer wall of the expansion section 301 contacts the inlet chamber 1. This further enhances the sealing performance of the dual-duct compression component flow measurement system and prevents dust and impurities from the test site from flowing back into the inlet chamber 1 and affecting the intake environment.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual-duct compression component flow measurement system, characterized in that: include: an air inlet chamber, the air inlet chamber being used to provide a test air flow; a pressure stabilizing box, the inlet end of which is in communication with the outlet end of the air inlet chamber via a first airflow duct, the inlet end of the first airflow duct being provided with a flow tube for measuring the flow rate of air entering the first airflow duct; A compression component test piece, wherein the compression component test piece is a double-duct structure having an inner flow channel and an outer flow channel, and the compression component test piece is connected to the outlet end of the pressure regulating box through a second air flow duct; An exhaust volute is provided with an outer exhaust channel and an inner exhaust channel in the exhaust volute, the outer exhaust channel is connected to the outer flow channel outlet end, and the inner exhaust channel is connected to the inner flow channel outlet end; the exhaust volute is provided with sealing grooves at positions corresponding to the outer flow channel inner surface outlet end, the inner flow channel outer surface outlet end, and the inner flow channel inner surface outlet end, respectively, the outer flow channel inner surface outlet end, the inner flow channel outer surface outlet end, and the inner flow channel inner surface outlet end are respectively inserted into the corresponding sealing grooves, and the axial clearance between the outer flow channel inner surface outlet end, the inner flow channel outer surface outlet end, the inner flow channel inner surface outlet end and the corresponding sealing groove axial bottom surface is greater than or equal to a preset spacing threshold, and the preset spacing threshold is based on the outer surface outlet end, the inner flow channel outer surface outlet end, and the inner flow channel inner surface outlet end. The analysis obtained is the preset spacing threshold, is the test safety factor, The value range is 1.1 to 1.

5. is the expansion coefficient of the compression component test piece, is the initial axial length of the compression component test piece, is the difference between the temperature of the compression component test piece under the test conditions and the room temperature, is the vibration frequency of the compression component test piece during the test, is the vibration acceleration, is the axial force on the compression component test piece during the test, is the elastic modulus of the material used for the compression component test piece, is the cross-sectional area of ​​the transmission shaft of the compression component test piece; an annular asbestos packing is further provided between the inner surface outlet end of the outer duct, the outer surface outlet end of the inner duct, the inner surface outlet end of the inner duct and the axial bottom surface of the corresponding sealing groove; a spring is provided between the asbestos packing and the axial bottom surface of the corresponding sealing groove, and the elastic force of the spring is greater than the friction force between the asbestos packing and the upper and lower walls of the sealing groove when the asbestos packing is fully sealed; An exhaust pipe, comprising an outer exhaust pipe and an inner exhaust pipe, wherein the inner exhaust pipe is connected to the inner exhaust channel and a flow meter is provided in the inner exhaust pipe; the outer exhaust pipe is connected to the outer exhaust channel and a pressure probe is provided in the outer exhaust pipe; A power drive system is used to drive the internal rotor of the compression component test piece to rotate.

2. The dual-duct compression component flow measurement system according to claim 1, characterized in that: The elastic coefficient of the spring is in the range of ,in Preload force The axial displacement of the compression component test piece is caused by is the thickness of the asbestos packing, The value range is , is the contact surface width between the asbestos packing and the sealing groove, is the friction coefficient between the asbestos packing and the sealing groove, is the elastic coefficient of asbestos packing, is the radial height of the sealing groove.

3. The dual-duct compression component flow measurement system according to claim 1, characterized in that: The air inlet chamber includes a horizontal section and a vertical section, and the horizontal section is connected to the vertical section; the outlet end of the air inlet chamber is arranged at the end of the horizontal section away from the vertical section; the air inlet chamber is provided with a guide vane at the corner connection between the horizontal section and the vertical section, and the guide vane includes a plurality of arc guide blades arranged evenly at intervals.

4. The dual-duct compression component flow measurement system according to claim 3, characterized in that: The chord length of the guide blades ranges from 1.3 to 1.5 m, the number of guide blades ranges from 8 to 10, the grid pitch ranges from 0.6 to 0.7 m, and the guide blade paving angle ranges from 40° to 45°.

5. The dual-duct compression component flow measurement system according to claim 3, characterized in that: A rectifying net is provided in the horizontal section, and the rectifying net is provided at a downstream position of the guide vane.

6. The dual-duct compression component flow measurement system according to claim 1, characterized in that: The inlet end of the first air flow duct is provided with an expansion section with a smoothly increasing diameter. The expansion section extends into the air intake chamber near the end of the air intake chamber and is coaxially connected to the flow tube. A rubber sealing plate is provided at the circumferential position where the outer wall of the expansion section contacts the air intake chamber.

7. A method for measuring flow of a dual-ducted compression component, the method being based on the dual-ducted compression component flow measurement system according to claim 1, characterized in that: include: Start the power drive system to drive the rotor inside the compression component test piece to rotate; After the flow tube measurement data at the inlet end of the first air flow tube is stable, a first flow value of the flow tube is read, and a second flow value of the flow meter in the inner exhaust pipe and a pressure value of the pressure measuring probe in the outer exhaust pipe are read respectively; According to the pressure value of the pressure measuring probe, a third flow rate in the outer exhaust pipe is obtained by analyzing the flow rate formula; If the first flow value data is the sum of the second flow and the third flow, the first flow data is output as the flow test value of the dual-duct compression component. Otherwise, the airtight performance of the dual-duct compression component flow measurement system is checked until the first flow value data is the sum of the second flow and the third flow, and then the first flow data is output as the flow test value of the dual-duct compression component.

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