A performance test and analysis method for a dual-shaft compressor

Abstract

The present application provides a dual-axis compressor performance test and analysis method for associating uniaxial compressor test results with whole-machine test results, belonging to the field of aero-engine testing. The method comprises: constructing a dual-axis compressor performance test layout that associates uniaxial compressor test results with whole-machine test results, wherein the test layout comprises determining the axial test position and circumferential test position of the total temperature instrument and the total pressure instrument within each test section of the dual-axis compressor; conducting a dual-axis compressor test based on the constructed dual-axis compressor performance speed measurement layout, obtaining the dual-axis compressor test results, characterizing the uniaxial compressor test results and the whole-machine test results based on the dual-axis compressor test results, and completing the association of the test results. The present application improves the efficiency of the integrated analysis of uniaxial compressor, biaxial compressor, and whole-machine test data, and expands the application scope of the test data.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine testing, and in particular to a method for testing and analyzing the performance of a dual-axis compressor. Background Art

[0002] The results of single-axis compressor tests deviate from those obtained on the complete engine. This deviation is related to upstream and downstream pressure, temperature, turbulence, and wake distribution within the complete engine, limiting the usefulness of single-axis compressor tests. Furthermore, complete engine tests cannot obtain performance data across the entire speed range, including the surge boundary. However, dual-axis compressor tests, utilizing realistic engine component structures, offer the advantages of accurately simulating real engine environments and enabling multi-degree-of-freedom parameter adjustment, enabling a true evaluation of the performance of the complete compressor system.

[0003] However, due to the structural limitations of uniaxial compressors, complete machines, and biaxial compressors, it is generally difficult to achieve correlation analysis of the performance of uniaxial compressors, biaxial compressors, and complete machines by arranging the same test instruments in the same position.

[0004] The existing test layout of the single-axis compressor test is mainly aimed at the test layout of the single-axis compressor inlet and outlet. There is no circumferential arrangement method for the test instruments, and it does not effectively combine the structural characteristics of the whole machine and the characteristics of the low-pressure outlet flow field. The test layout scheme cannot truly reflect the aerodynamic parameters of the high-pressure inlet and outlet positions, and cannot accurately evaluate the compressor performance; there is no relevant test layout design method for the dual-axis compressor, and the test results of the whole machine and the single-axis compressor cannot be directly linked. A large number of compressor tests need to be supplemented, which increases the test energy consumption economic cost, labor cost, and compressor development time cost. If the compressor test is added, the test preparation and data analysis time will also increase accordingly, and the compressor development efficiency will be reduced.

[0005] Therefore, a method is needed to correlate the uniaxial compressor test results with the whole machine test results so as to analyze the biaxial compressor test results. Summary of the Invention

[0006] The purpose of this application is to provide a dual-axis compressor performance test and analysis method to solve or alleviate at least one problem in the background technology.

[0007] The technical solution of the present application is: a biaxial compressor performance test and analysis method for correlating uniaxial compressor test results with whole-machine test results, the method comprising:

[0008] Constructing a biaxial compressor performance test layout that correlates uniaxial compressor test results with full-machine test results, the test layout including determining axial and circumferential test locations for total temperature and total pressure instruments within each test section of the biaxial compressor;

[0009] Based on the constructed dual-axial compressor performance speed measurement layout, a dual-axial compressor test is carried out to obtain the dual-axial compressor test results. Based on the dual-axial compressor test results, the uniaxial compressor test results and the whole machine test results are characterized to complete the correlation of the test results.

[0010] Preferably, the biaxial compressor includes a low-pressure compressor, a high-pressure compressor, and an intermediate casing connecting the high-pressure compressor and the low-pressure compressor, a low-pressure compressor inlet test section M1 and a low-pressure compressor outlet test section M2 are respectively provided at the inlet and outlet of the low-pressure compressor, an intermediate casing test section M3 is provided on the intermediate casing, and a high-pressure compressor inlet test section M4, a high-pressure compressor outlet first test section M5, and a high-pressure compressor outlet second test section M6 are respectively provided at the inlet and outlet of the high-pressure compressor;

[0011] The low-pressure compressor inlet test section M1 and the low-pressure compressor outlet test section M2 constitute the associated test layout when the biaxial compressor and the uniaxial compressor are low-pressure compressors, and the intermediate casing test section M3 is used to verify the accuracy of the uniaxial compressor test layout;

[0012] The high-pressure compressor inlet test section M4 and the high-pressure compressor outlet second test section M6 constitute an associated test layout when the biaxial compressor and the uniaxial compressor are high-pressure compressors;

[0013] The low-pressure compressor inlet test section M1, the low-pressure compressor outlet test section M2, the high-pressure compressor inlet test section M4, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 constitute the associated test layout of the biaxial compressor and the whole machine.

[0014] Preferably, the axial test positions and circumferential test positions of the total temperature instrument and the total pressure instrument in each test section of the biaxial compressor are arranged as follows:

[0015] 1) The axial distance between the low-pressure compressor inlet test section M1 and the leading edge of the first row of blades at the low-pressure compressor inlet is 0.4 to 0.8b1. Two to four total pressure instruments and two total temperature instruments are evenly distributed circumferentially. The axial position of the measuring points deviates from that of the complete machine and the single-axis compressor by less than 0.2b1. The number of radial measuring points of the total temperature instrument or the total pressure instrument shall be greater than five, and one measuring point shall be set close to the inner and outer walls.

[0016] 2) The axial distance between the low-pressure compressor outlet measurement section M2 and the trailing edge of the last row of stator blades at the low-pressure compressor outlet is 0.5 to 1.0 b2. There are 6 to 10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 6.

[0017] 3) The intermediate casing test section M3 is 1.0 to 3.0 b2 axially away from the trailing edge of the last row of stator blades at the low-pressure compressor outlet, and has 2 to 4 circumferential total pressure instruments. The number of radial measuring points of the total pressure instruments is greater than 8, of which at least 5 points are arranged at the high-pressure compressor inlet;

[0018] 4) The axial distance between the high-pressure compressor inlet test section M4 and the leading edge of the first row of blades at the high-pressure compressor inlet is 0.4 to 0.6b3. There are 6 to 10 circumferential total temperature and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature and total pressure instruments are evenly distributed in the circumferential range. The axial position deviation of the measuring point is less than 0.1b3 from the overall position. The total temperature and total pressure instruments have more than 5 radial measuring points, and one point is set close to the inner and outer walls.

[0019] 5) The first test section M5 at the high-pressure compressor outlet is axially located in the middle of the slot of the last row of stator blades at the high-pressure compressor outlet. There are 6 to 8 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 4.

[0020] 6) The second test section M6 at the high-pressure compressor outlet is axially located 1.0 to 3.0 b4 from the trailing edge of the last row of stator blades at the high-pressure compressor outlet. There are 6 to 10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 4.

[0021] 7) The total temperature instruments and total pressure instruments at the low-pressure compressor outlet section M2, the intermediate casing test section M3, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 do not have the same or similar angular distribution, and the instrument blockage ratio of each test section is less than 5%;

[0022] Among them, b1 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the low-pressure compressor inlet, b2 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the low-pressure compressor outlet, b3 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the high-pressure compressor inlet, and b4 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the high-pressure compressor outlet.

[0023] Preferably, the angular position of the total temperature instrument or the total pressure instrument in each test section is arranged according to the following formula:

[0024] ;

[0025] Where, The test sectionj The circumferential angle of the total temperature instrument or total pressure instrument, Z is the number of blades at the inlet or outlet of the low-pressure compressor or high-pressure compressor corresponding to the test section, M is the number of total temperature instruments or total pressure instruments in the test section, j For the j Support total temperature instrument or total pressure instrument, t is a natural number.

[0026] Preferably, the process of characterizing the uniaxial compressor test results and the whole machine test results based on the biaxial compressor test results and completing the correlation of the test results includes:

[0027] Determine the test sections corresponding to the dual-shaft compressor, uniaxial compressor and complete machine tests;

[0028] Calculate the average values ​​of the total temperature and total pressure instruments within the test sections corresponding to the dual-shaft compressor, the single-shaft compressor, and the complete machine test;

[0029] Calculate the average total temperature and total pressure in each test section of the uniaxial compressor and the entire machine;

[0030] Based on the calculated average values ​​of the total temperature and total pressure instruments in each test section of the biaxial compressor and the average values ​​of the total temperature and total pressure in each test section of the uniaxial compressor and the whole machine, fitting is performed to obtain the total temperature and total pressure fitting values, thereby realizing the use of the biaxial compressor test results to characterize the uniaxial compressor and the compressor whole machine test results;

[0031] Based on the fitted values ​​of total temperature and total pressure of each test section, the data analysis of the test results of the dual-axial compressor, the single-axial compressor and the whole machine was completed using the existing compressor performance calculation formula.

[0032] Preferably, the average values ​​of the total temperature instrument and the total pressure instrument in each test section of the biaxial compressor and the average values ​​of the total temperature and total pressure in each test section of the uniaxial compressor and the whole machine are calculated based on the area weighted average method.

[0033] Preferably, the existing compressor performance calculation formulas include a pressure ratio calculation formula, a temperature rise ratio calculation formula, and a temperature rise efficiency calculation formula.

[0034] The method of the present application combines the characteristics of the low-pressure outlet flow field, the structural characteristics of the intermediate casing, etc., fully considers the non-uniformity of the circumferential total temperature and total pressure of the measurement section, and constructs a dual-axis compressor test layout by rationally selecting test positions that can characterize the average total pressure and total temperature of each blade height. This solves the problem that the existing test layout scheme is poorly targeted, cannot effectively associate the single-axis compressor and the whole machine test layout, and cannot accurately evaluate the compressor performance. In addition, based on the dual-axis compressor test layout, a dual-axis compressor test result data analysis is carried out to associate the single-axis compressor and the whole machine test results, solving the problem that the single-axis compressor and the whole machine test results cannot be associated. This application improves the efficiency of the integrated analysis of single-axis compressor, dual-axis compressor, and whole machine test data, and increases the application scope of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0036] Figure 1 Schematic diagram of the dual-axis compressor performance test and analysis method of this application.

[0037] Figure 2 This is a schematic diagram of the axial layout of the dual-axis compressor performance test section in this application.

[0038] Figure 3 This is a schematic diagram of the circumferential layout of the dual-axis compressor performance test section in this application.

[0039] Figure 4 This is a schematic diagram of the relative positions of various instruments in the low-pressure compressor outlet measurement section M2 converted into the same blade slot according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0041] like Figure 1 As shown, the present application proposes a dual-axis compressor performance test and analysis method, which can realize the correlation between the uniaxial compressor test results and the whole machine test results. The method includes:

[0042] S10, constructing a biaxial compressor performance test layout that correlates the uniaxial compressor test results with the whole-machine test results. This test layout mainly determines the axial test positions and circumferential test positions of the total temperature instrument and the total pressure instrument (or probe) in each test section of the biaxial compressor.

[0043] like Figure 2The schematic diagram of the axial layout of the dual-axis compressor performance test section is shown as follows: Figure 3 The figure shows a schematic diagram of the circumferential layout of performance test sections for a biaxial compressor. The biaxial compressor includes a low-pressure compressor 1, a high-pressure compressor 3, and an intermediate casing 2 connecting the high-pressure and low-pressure compressors. An outer flow channel and an inner flow channel are formed on the intermediate casing 2. A low-pressure compressor inlet test section M1 and a low-pressure compressor outlet test section M2 are respectively provided at the inlet and outlet of the low-pressure compressor 1. An intermediate casing test section M3 is provided on the intermediate casing 2. Furthermore, a high-pressure compressor inlet test section M4, a first high-pressure compressor outlet test section M5, and a second high-pressure compressor outlet test section M6 are respectively provided at the inlet and outlet of the high-pressure compressor 3.

[0044] Among them, the low-pressure compressor inlet test section M1 and the low-pressure compressor outlet test section M2 are the associated test layouts of the dual-axis compressor and the uniaxial compressor (low-pressure compressor) in this application, and the intermediate casing test section M3 is used to verify the accuracy of the uniaxial compressor test layout.

[0045] The high-pressure compressor inlet test section M4 and the high-pressure compressor outlet second test section M6 are the associated test layouts of the dual-axis compressor and the single-axis compressor (high-pressure compressor) in this application.

[0046] The low-pressure compressor inlet test section M1, the low-pressure compressor outlet test section M2, the high-pressure compressor inlet test section M4, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 are the associated test layouts of the dual-axis compressor and the whole machine in this application.

[0047] The axial and circumferential test positions of the total temperature instrument and the total pressure instrument in each test section of the dual-axis compressor in this application are arranged as follows:

[0048] 1) The axial distance between the low-pressure compressor inlet test section M1 and the leading edge of the first row of low-pressure compressor inlet blades is 0.4 to 0.8 μm. Two to four total pressure instruments and two total temperature instruments are evenly distributed circumferentially. The axial position of the measuring points should deviate from that of the complete compressor and the single-axis compressor by less than 0.2 μm. If the instrument structure allows, the number of radial measuring points should exceed five, with one measuring point located near each of the inner and outer walls.

[0049] 2) The axial distance between the low-pressure compressor outlet measurement section M2 and the trailing edge of the last row of stator blades at the low-pressure compressor outlet is 0.5~1.0b2. There are 6~10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The instruments are roughly evenly distributed within the 360° circumferential range and are evenly distributed when converted to relative positions within the blade slot. For example, Figure 4The figure shows the relative positions of the instruments in the low-pressure compressor outlet measurement section M2, converted to the same blade slot in this embodiment. The high-pressure compressor is similar. The angular positions of the instruments are arranged according to Equation 1. If the instrument structure allows, the number of radial measurement points can exceed 6.

[0050] (1)

[0051] Where, The test section j The circumferential angle of the total temperature instrument or total pressure instrument, Z is the number of blades at the inlet or outlet of the low-pressure compressor or high-pressure compressor corresponding to the test section, M is the number of total temperature instruments or total pressure instruments in the test section, j For the j Instruments, t is a natural number.

[0052] 3) The intermediate casing test section M3 is located axially 1.0 to 3.0 b2 from the trailing edge of the last row of stator blades at the low-pressure compressor outlet. Two to four circumferential total pressure instruments are installed, evenly spaced relative to their positions within the blade slots, following the conversion method for low-pressure compressor outlet instruments. Where the instrument structure permits, the number of radial measurement points may exceed eight, with at least five located at the high-pressure compressor inlet.

[0053] 4) The axial distance from the high-pressure compressor inlet test section M4 to the leading edge of the first row of high-pressure compressor inlet blades is 0.4 to 0.6b3. A total of 6 to 10 circumferential total temperature and total pressure instruments are required. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The instruments are roughly evenly distributed throughout the 360° circumference, and the axial position of the measuring points deviates from the overall position by less than 0.1b3. If the instrument structure allows, radial measurement points should exceed 5, with one measuring point located near each of the inner and outer walls.

[0054] 5) The first test section M5 at the high-pressure compressor outlet is primarily intended for use with the entire unit. It is located axially in the center of the last row of stator blade slots at the high-pressure compressor outlet. Six to eight circumferential total temperature and total pressure instruments are installed. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. Each instrument is roughly evenly distributed throughout the 360° circumference and, when converted to relative positions within the blade slots, is evenly spaced. Refer to the conversion method for low-pressure compressor outlet instruments. Where the instrument structure permits, the number of radial measurement points may exceed four.

[0055] 6) The second test section M6 at the high-pressure compressor outlet is primarily intended for use with single-axis compressors. It is located axially between 1.0 and 3.0° from the trailing edge of the last row of stator blades at the high-pressure compressor outlet. Six to ten circumferential total temperature and total pressure instruments are required. The number of total pressure instruments should be greater than or equal to the number of total temperature instruments. The instruments should be roughly evenly distributed throughout the 360° circumference and evenly spaced relative to their positions within the blade slots. Refer to the instrument conversion method for the low-pressure compressor outlet. Where the instrument structure permits, the number of radial measurement points may exceed four.

[0056] 7) The instruments in the low-pressure compressor outlet section M2, the intermediate casing test section M3, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 should not have the same or similar angular distribution to avoid interference between the upstream and downstream instruments of adjacent test sections. The number of instruments in each test section should not be too large, and the instrument blockage ratio should be less than 5%.

[0057] like Figure 2 As shown, b1 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the low-pressure compressor inlet, b2 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the low-pressure compressor outlet, b3 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the high-pressure compressor inlet, and b4 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the high-pressure compressor outlet.

[0058] S20, based on the constructed dual-axial compressor performance speed measurement layout, conduct dual-axial compressor tests, obtain dual-axial compressor test results, characterize uniaxial compressor test results and whole-machine test results based on the dual-axial compressor test results, and complete the correlation of test results.

[0059] The process of characterizing the uniaxial compressor test results and the whole-machine test results based on the biaxial compressor test results includes:

[0060] S21, determining the test sections corresponding to the dual-axial compressor, the uniaxial compressor, and the whole machine test.

[0061] In this application, the low-pressure compressor inlet test section M1 and the low-pressure compressor outlet test section M2 correspond to the inlet and outlet test sections of a uniaxial compressor (low-pressure compressor), and the intermediate casing test section M3 is used for auxiliary verification. The high-pressure compressor inlet test section M4 and the high-pressure compressor outlet second test section M6 correspond to the inlet and outlet test sections of a uniaxial compressor (high-pressure compressor). The low-pressure compressor inlet test section M1 and the low-pressure compressor outlet test section M2 correspond to the inlet and outlet test sections of the complete compressor (low-pressure compressor), while the high-pressure compressor outlet first test section M5 and the high-pressure compressor outlet second test section M6 correspond to the inlet and outlet test sections of the complete compressor (high-pressure compressor).

[0062] S22, calculate the average values ​​of the total temperature instruments and the total pressure instruments in the test sections corresponding to the dual-axis compressor, the single-axis compressor, and the whole machine test.

[0063] In this application, the average values ​​of the total temperature instruments and the total pressure instruments in each test section of the dual-axis compressor are calculated according to the area-weighted average method.

[0064] In this embodiment of the present application, the calculation of the total pressure at the low-pressure compressor outlet is taken as an example. The calculation method thereof is shown in Formula 2: (2)

[0065] Where, For the j The average value of the total pressure instrument, For the j The first of the total pressure instruments i The measured value of each measuring point, For the j Instrument i The area of ​​the ring where the measuring point is located, A is the total pressure ring area at the outlet of the low-pressure compressor, m It is the number of radial measuring points of the total pressure instrument at the low-pressure compressor outlet.

[0066] S23, calculate the average total temperature and total pressure of the uniaxial compressor and each test section of the entire machine.

[0067] Similarly, in this application, the average values ​​of the total temperature and total pressure of the uniaxial compressor and each test section of the entire machine can also be calculated according to the area-weighted average method.

[0068] It should be noted that when calculating the average total temperature and total pressure of the single-axis compressor and each test section of the entire machine, the average value of each instrument is not calculated separately.

[0069] S24, based on the average values ​​of the total temperature instrument and the total pressure instrument of each test section of the biaxial compressor calculated in step S22 and the average values ​​of the total temperature and total pressure of each test section of the uniaxial compressor and the whole machine calculated in step S23, fitting is performed to obtain the fitting values ​​of the total temperature and total pressure, thereby realizing the use of the biaxial compressor test results to characterize the test results of the uniaxial compressor and the compressor whole machine.

[0070] This embodiment of the present application takes the calculation of the low-pressure compressor outlet total pressure based on the biaxial compressor test results as an example. The calculation of other parameters is similar. The low-pressure compressor outlet total pressure is calculated according to Formula 3:

[0071] (3)

[0072] Where, represents the uniaxial state fitting value of the low-pressure compressor outlet represented by the biaxial compressor test results, It represents the average value of the j-th total pressure instrument at the outlet of the low-pressure compressor in the biaxial compressor test results. express The corresponding fitting coefficients are, N is the relative conversion speed of the low-pressure compressor, C Is the fitting coefficient corresponding to the speed. Single-axis state fitting value The relative error of the outlet total pressure calculated based on the actual test data of the uniaxial compressor is less than 0.2% in the speed range of 30%~100%.

[0073] S25, based on the total temperature and total pressure fitting values ​​of each test section obtained in step S24, complete the data analysis of the dual-axis compressor to single-axis compressor and the whole machine test results through existing compressor performance calculation formulas such as pressure ratio, temperature rise ratio, and temperature rise efficiency.

[0074] The method of the present application combines the characteristics of the low-pressure outlet flow field, the structural characteristics of the intermediate casing, etc., fully considers the non-uniformity of the circumferential total temperature and total pressure of the measurement section, and constructs a dual-axis compressor test layout by rationally selecting test positions that can characterize the average total pressure and total temperature of each blade height. This solves the problem that the existing test layout scheme is poorly targeted, cannot effectively associate the single-axis compressor and the whole machine test layout, and cannot accurately evaluate the compressor performance. In addition, based on the dual-axis compressor test layout, a dual-axis compressor test result data analysis is carried out to associate the single-axis compressor and the whole machine test results, solving the problem that the single-axis compressor and the whole machine test results cannot be associated. This application improves the efficiency of the integrated analysis of single-axis compressor, dual-axis compressor, and whole machine test data, and increases the application scope of test data.

[0075] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A dual-axis compressor performance test and analysis method for correlating uniaxial compressor test results with complete machine test results, characterized in that: The method comprises: A biaxial compressor performance test layout is constructed to associate the test results of the uniaxial compressor with the test results of the whole machine. The test layout includes determining the axial test position and circumferential test position of the total temperature instrument and the total pressure instrument in each test section in the biaxial compressor. The biaxial compressor includes a low-pressure compressor, a high-pressure compressor and an intermediate casing connecting the high-pressure compressor and the low-pressure compressor. The test layout includes: respectively setting a low-pressure compressor inlet test section M1 and a low-pressure compressor outlet test section M2 at the inlet and outlet of the low-pressure compressor, setting an intermediate casing test section M3 on the intermediate casing, and respectively setting a high-pressure compressor inlet test section M4, a high-pressure compressor outlet first test section M5 and a high-pressure compressor outlet test section M6 at the inlet and outlet of the high-pressure compressor. wherein, the low-pressure compressor inlet test section M1 and the low-pressure compressor outlet test section M2 constitute the associated test layout of the biaxial compressor and the uniaxial compressor when they are low-pressure compressors, and the intermediate casing test section M3 is used to verify the accuracy of the uniaxial compressor test layout; the high-pressure compressor inlet test section M4 and the high-pressure compressor outlet second test section M6 constitute the associated test layout of the biaxial compressor and the uniaxial compressor when they are high-pressure compressors; the low-pressure compressor inlet test section M1, the low-pressure compressor outlet test section M2, the high-pressure compressor inlet test section M4, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 constitute the associated test layout of the biaxial compressor and the whole machine; Based on the constructed dual-axial compressor performance speed measurement layout, a dual-axial compressor test is carried out to obtain the dual-axial compressor test results. Based on the dual-axial compressor test results, the uniaxial compressor test results and the whole machine test results are characterized to complete the correlation of the test results.

2. The biaxial compressor performance test and analysis method according to claim 1, characterized in that: The arrangement method of the axial test positions and circumferential test positions of the total temperature instrument and the total pressure instrument in each test section of the biaxial compressor is as follows: 1) The axial distance between the low-pressure compressor inlet test section M1 and the leading edge of the first row of blades at the low-pressure compressor inlet is 0.4 to 0.8b1. Two to four total pressure instruments and two total temperature instruments are evenly distributed circumferentially. The axial position of the measuring points deviates from that of the whole machine and the single-axis compressor by less than 0.2b1. The number of radial measuring points of the total temperature instrument or the total pressure instrument is greater than 5, and one measuring point is set close to the inner and outer walls. 2) The axial distance between the low-pressure compressor outlet measurement section M2 and the trailing edge of the last row of stator blades at the low-pressure compressor outlet is 0.5 to 1.0 b2. There are 6 to 10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 6. 3) The intermediate casing test section M3 is 1.0 to 3.0 b2 axially away from the trailing edge of the last row of stator blades at the low-pressure compressor outlet, and has 2 to 4 circumferential total pressure instruments, with the total pressure instrument having more than 8 radial measuring points, of which at least 5 are arranged at the high-pressure compressor inlet; 4) The axial distance between the high-pressure compressor inlet test section M4 and the leading edge of the first row of blades at the high-pressure compressor inlet is 0.4 to 0.6b3. There are 6 to 10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The axial position deviation of the measuring point is less than 0.1b3 from the whole machine. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 5, and one point is set close to the inner and outer walls. 5) The first test section M5 at the high-pressure compressor outlet is axially located in the middle of the slot of the last row of stator blades at the high-pressure compressor outlet. There are 6 to 8 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 4. 6) The second test section M6 at the high-pressure compressor outlet is axially located 1.0 to 3.0 b4 from the trailing edge of the last row of stator blades at the high-pressure compressor outlet. There are 6 to 10 circumferential total temperature instruments and total pressure instruments. The number of total pressure instruments is greater than or equal to the number of total temperature instruments. The total temperature instruments and total pressure instruments are evenly distributed in the circumferential range. The number of radial measuring points of the total temperature instruments and total pressure instruments is greater than 4. 7) The total temperature instruments and total pressure instruments in the low-pressure compressor outlet section M2, the intermediate casing test section M3, the high-pressure compressor outlet first test section M5, and the high-pressure compressor outlet second test section M6 do not have the same or similar angular distribution, and the instrument blockage ratio of each test section is less than 5%; Among them, b1 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the low-pressure compressor inlet, b2 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the low-pressure compressor outlet, b3 is the axial projection of the blade chord length at the arithmetic mean radius of the first row of blades at the high-pressure compressor inlet, and b4 is the axial projection of the blade chord length at the arithmetic mean radius of the last row of stator blades at the high-pressure compressor outlet.

3. The biaxial compressor performance test and analysis method according to claim 2, characterized in that: The angular position of the total temperature instrument or total pressure instrument in each test section is arranged according to the following formula: θ Pj =(t+(j-1) / M)×360 / Z; Where θ Pj is the circumferential angle of the j-th total temperature instrument or total pressure instrument in the test section, Z is the number of blades at the inlet or outlet of the low-pressure compressor or high-pressure compressor corresponding to the test section, M is the number of total temperature instruments or total pressure instruments in the test section, j is the j-th total temperature instrument or total pressure instrument, and t is a natural number.

4. The biaxial compressor performance test and analysis method according to claim 3, characterized in that: The process of characterizing the uniaxial compressor test results and the whole-machine test results based on the biaxial compressor test results includes: Determine the test sections corresponding to the dual-shaft compressor, uniaxial compressor and complete machine tests; Calculate the average values ​​of the total temperature and total pressure instruments within the test sections corresponding to the dual-shaft compressor, the single-shaft compressor, and the complete machine test; Calculate the average total temperature and total pressure in each test section of the uniaxial compressor and the entire machine; Based on the calculated average values ​​of the total temperature and total pressure instruments in each test section of the biaxial compressor and the average values ​​of the total temperature and total pressure in each test section of the uniaxial compressor and the whole machine, fitting is performed to obtain the total temperature and total pressure fitting values, thereby realizing the use of the biaxial compressor test results to characterize the uniaxial compressor and the compressor whole machine test results; Based on the fitted values ​​of total temperature and total pressure of each test section, the data analysis of the test results of the dual-axial compressor, the single-axial compressor and the whole machine was completed using the existing compressor performance calculation formula.

5. The dual-axis compressor performance test and analysis method according to claim 4, characterized in that: The average values ​​of the total temperature and total pressure instruments in each test section of the biaxial compressor and the average values ​​of the total temperature and total pressure in each test section of the uniaxial compressor and the entire machine are calculated based on the area-weighted average method.

6. The method for testing and analyzing the performance of a biaxial compressor according to claim 4, wherein: Existing compressor performance calculation formulas include pressure ratio calculation formula, temperature rise ratio calculation formula, and temperature rise efficiency calculation formula.

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