Method for regulating and controlling bypass ratio under condition of simulating whole turbofan engine

Abstract

The invention provides a method for simulating bypass ratio regulation and control under the complete machine condition of a turbofan engine, and the method is realized based on a double-shaft compressor tester, and belongs to the field of aero-engine tests.The method comprises the steps that control parameters under the complete machine state are determined; determining the control precision of the test state control parameters of the double-shaft compressor tester; constructing a control module which stores an adjusting rule in a whole machine state and is used for enabling the rotating speed of the fan and the rotating speed of the high-pressure compressor to be in a linkage mode in the test process; the fan pressure ratio is monitored, an outer culvert throttling valve is adjusted, then an inner culvert throttling valve is adjusted, the high-pressure compressor pressure ratio is monitored at the same time, and finally the inner culvert throttling valve and the outer culvert throttling valve are adjusted at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the requirements; the state of the double-shaft compressor tester is kept stable, and compressor parameters are collected through an inner and outer culvert exhaust collection device; the rotating speed of the high-pressure compressor or the rotating speed of the fan is adjusted according to the rotating speed difference of the fan and the high-pressure compressor in the complete machine state, and parameters of the compressor are collected after stabilization.

Description

Technical Field

[0001] The present application relates to the field of aero-engines, and in particular to a method for controlling the bypass ratio under conditions of a simulated turbofan engine as a whole. Background Art

[0002] The bypass ratio is a key parameter of a turbofan engine, which is defined as the ratio of the airflow rate flowing into the engine's outer bypass to the airflow rate flowing into the inner bypass. The bypass ratio has a significant impact on the thrust, fuel efficiency, noise and other performance of the turbofan engine. During the test of the turbofan engine as a whole, due to structural limitations, the total flow rate flowing into the turbofan engine can only be measured at the inlet of the turbofan engine, and the real-time measurement of the bypass ratio cannot be achieved, and the bypass ratio under the working environment of the turbofan engine as a whole cannot be obtained.

[0003] Although there are methods for controlling the bypass ratio of single-shaft compressors in the prior art, since a single-shaft compressor has only one rotating shaft, it lacks a part of the compression system compared to a turbofan engine. Therefore, the structural form and working mode of the single-shaft compressor are quite different from those of a turbofan engine. It cannot simulate the actual working environment and working state of a turbofan engine, and cannot directly provide bypass ratio data support for the development of a turbofan engine. Summary of the invention

[0004] The purpose of the present application is to provide a method for regulating the bypass ratio under the conditions of a simulated turbofan engine as a whole machine, so as to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: a method for regulating the bypass ratio under the condition of simulating a complete turbofan engine, which is implemented based on a dual-axis compressor tester, and the method comprises: Determine the control parameters under the whole machine state, the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment law, the high-pressure compressor blade angle adjustment law, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio; Determine the control accuracy of the test state control parameters of the biaxial compressor tester; Constructing a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment law and the high-pressure compressor blade angle adjustment law, and is used to make the speeds of the fan and the high-pressure compressor in a linkage mode during the test; Monitor the fan pressure ratio, adjust the outer throttle valve, make the fan pressure ratio the same or similar to that of the whole machine, then adjust the inner throttle valve, monitor the high-pressure compressor pressure ratio at the same time, make the high-pressure compressor pressure ratio the same or similar to that of the whole machine, and then adjust the inner throttle valve and the outer throttle valve at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the control accuracy requirements; Keep the state of the biaxial compressor tester stable, collect compressor parameters through the outer exhaust collection device and the inner exhaust collection device of the biaxial compressor tester, the compressor parameters include fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle and bypass ratio, and the stable state is used as the basic state design point of the inner and outer rotor variable speed difference test; According to the fan and high-pressure compressor speed difference requirements under the whole machine state, the high-pressure compressor speed or fan speed is adjusted according to the preset speed interval. When the high-pressure compressor speed and the fan speed are stable, the compressor parameters are collected, and then the next fan and high-pressure compressor speed difference adjustment and compressor parameters collection are carried out.

[0006] Preferably, determining the control accuracy of the test state control parameters of the biaxial compressor tester includes: The control accuracy of the converted speed of the fan and high-pressure compressor is determined to be 0.2%, the adjustment accuracy of the blade angle of the fan and high-pressure compressor is 0.5°, and the control accuracy of the pressure ratio of the fan and high-pressure compressor is 0.3%.

[0007] Preferably, when the fan and the high-pressure compressor reach the target rotational speeds, the linkage relationship between the rotational speeds of the fan and the high-pressure compressor is released.

[0008] Preferably, the same or similar means that the fan pressure ratio or the high-pressure compressor pressure ratio is no more than 10% of the corresponding pressure ratio under the whole machine state.

[0009] Preferably, the predetermined rotation speed interval does not exceed 100 rpm.

[0010] In the second aspect, the technical solution provided by the present application is: a method for regulating the bypass ratio under the condition of simulating a complete turbofan engine, which is implemented based on a dual-axis compressor tester, and the method comprises: Determine the control parameters under the whole machine state, the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment law, the high-pressure compressor blade angle adjustment law, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio; Determine the control accuracy of the test state control parameters of the biaxial compressor tester; Constructing a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment law and the high-pressure compressor blade angle adjustment law, and is used to make the speeds of the fan and the high-pressure compressor in a linkage mode during the test; Monitor the fan pressure ratio, adjust the outer throttle valve, make the fan pressure ratio the same or similar to that of the whole machine, then adjust the inner throttle valve, monitor the high-pressure compressor pressure ratio at the same time, make the high-pressure compressor pressure ratio the same or similar to that of the whole machine, and then adjust the inner throttle valve and the outer throttle valve at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the control accuracy requirements; Keep the state of the biaxial compressor tester stable, collect compressor parameters through the outer exhaust gas collection device and the inner exhaust gas collection device of the biaxial compressor tester, the compressor parameters include fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle and bypass ratio, the stable state is the basic state design point when changing the turbine guide vane area or adjusting the tail nozzle area; According to the fan pressure ratio and high-pressure compressor pressure ratio adjusted according to the turbine guide vane area or tail nozzle area, adjust the internal throttle valve and the external throttle valve at the same time to make the fan pressure ratio and the high-pressure compressor pressure ratio the same as those in the whole machine state, and collect the compressor parameters after the state point stabilizes.

[0011] Preferably, determining the control accuracy of the test state control parameters of the biaxial compressor tester includes: The control accuracy of the converted speed of the fan and high-pressure compressor is determined to be 0.2%, the adjustment accuracy of the blade angle of the fan and high-pressure compressor is 0.5°, and the control accuracy of the pressure ratio of the fan and high-pressure compressor is 0.3%.

[0012] Preferably, the same or similar means that the fan pressure ratio or the high-pressure compressor pressure ratio is no more than 10% of the corresponding pressure ratio under the whole machine state.

[0013] The method of the present application can realize bypass ratio adjustment in a simulated whole machine environment, and the bypass ratio measurement can be realized by adjusting the bypass ratio individually or in combination through a variety of control means, without stopping the vehicle for hardware adjustment, which can effectively improve the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0015] Figure 1 This is a schematic diagram of the (partial) structure of the biaxial compressor tester in this application.

[0016] Figure 2 This is a top view of the (partial) structure of the biaxial compressor tester in this application. DETAILED DESCRIPTION

[0017] 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.

[0018] In order to realize the working environment simulation of the change process of the speed difference between the inner and outer rotors in the turbofan engine as a whole and the real-time measurement of the bypass ratio of the whole machine, or to realize the working environment simulation when changing the turbine guide vane area or adjusting the tail nozzle area in the turbofan engine as a whole and the real-time measurement of the bypass ratio of the whole machine, the present application proposes a bypass ratio control method based on a dual-axis compressor tester to simulate the working environment of the turbofan engine as a whole.

[0019] Combination Figure 1 and Figure 2 The figure shows a schematic diagram of the structure of a biaxial compressor tester, wherein the biaxial compressor tester 100 includes a fan 10 (or a low-pressure compressor), an intermediate casing 20, an outer exhaust gas collecting device 30, a high-pressure compressor 40, an inner exhaust gas collecting device 50, a transmission shaft 60, a gear box 70 and a driving device 80.

[0020] The fan 10 is provided with a fan blade angle adjustment system 11, which is connected to the fan 10 and is used to adjust and control the fan blade angle. The high-pressure compressor 40 is provided with a high-pressure blade angle adjustment system 41, which is connected to the high-pressure compressor 40 and is used to adjust and control the high-pressure compressor blade angle.

[0021] The inlet and outlet ends of the outer duct exhaust collection device 30 are respectively provided with an outer duct throttle valve 31 and an outer duct flow measurement device 32. The flow of the outer duct exhaust collection device 30 can be adjusted by the outer duct throttle valve 31, thereby controlling the fan operating point pressure ratio, and the outer duct exhaust flow measurement device 32 can be used to measure the outer duct exhaust flow. The inlet and outlet ends of the inner duct exhaust collection device 50 are respectively provided with an inner duct throttle valve 51 and an inner duct flow measurement device 52. The flow of the inner duct exhaust collection device 50 can be adjusted by the inner duct throttle valve 51, thereby controlling the high-pressure compressor operating point pressure ratio, and the inner duct flow measurement device 52 can measure the inner duct exhaust flow.

[0022] In this embodiment of the present application, the structure of the outer exhaust gas collecting device 30 is the same or similar to that of the inner exhaust gas collecting device 50, and both are spiral volute structures.

[0023] The intermediate casing 20 is disposed between the fan 10 and the high-pressure compressor 40 to form an inner and outer duct. The outer duct airflow flows to the outer duct exhaust collection device 30 through the intermediate casing 20, and the inner duct airflow flows to the inner duct exhaust collection device 50 after passing through the high-pressure compressor 40.

[0024] The transfer shaft 60 includes a high-pressure shaft 61 and a low-pressure shaft 62 , which are respectively connected to the high-pressure compressor 40 and the fan 10 to form inner and outer rotors, and are connected to the gear box 70 .

[0025] The driving device 80 includes a first driving device 81 and a second driving device 82, both of which are connected to the gear box 70, and the high-pressure shaft 61 and the low-pressure shaft 62 are driven to rotate respectively through the gear box 70, so as to realize the speed control of the fan 10 and the high-pressure compressor 40. In some embodiments of the present application, the driving device 80 is a driving motor, wherein the driving motor can be a stepping motor or a servo motor in terms of type to improve its control accuracy.

[0026] Based on the above-mentioned dual-axis compressor tester 100, the present application provides a bypass ratio control method under the conditions of a simulated turbofan engine as a whole machine, the method including: bypass ratio measurement under variable speed difference between inner and outer rotors and bypass ratio measurement under changing turbine guide vane or adjusting tail nozzle area.

[0027] 1. The bypass ratio measurement process under the variable speed difference between the inner and outer rotors is as follows: S11, determining control parameters under the whole machine state, wherein the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment rule, the high-pressure compressor blade angle adjustment rule, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio.

[0028] S12, determining the control accuracy of the test state control parameters of the biaxial compressor tester.

[0029] Since there is no test control requirement for bypass ratio regulation using a dual-axis compressor tester in the current prior art, this application determines that the control accuracy of the converted speed of the fan and high-pressure compressor is 0.2%, the fan and high-pressure compressor blade angle adjustment accuracy is 0.5°, and the control accuracy of the fan and high-pressure compressor pressure ratio is 0.3% based on the single-axis compressor test standard and dual-axis compressor test experience.

[0030] S13, construct a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment rule, the high-pressure compressor blade angle adjustment rule, etc., which is used to make the speed of the fan and the high-pressure compressor in a linkage mode during the test.

[0031] Before using the biaxial compressor tester 100 for testing, a control module is first constructed, and the matching relationship between the fan and high-pressure compressor speeds of the whole machine, the fan blade angle adjustment law, and the high-pressure compressor blade angle adjustment law are input into the control module. During the test, the control module only needs to control the high-pressure compressor speed to make each device or apparatus of the biaxial compressor tester 100 automatically operate according to the pre-input adjustment law. After reaching the target speed, the linkage relationship between the fan and high-pressure compressor speeds is released, and at this time, the high-pressure compressor speed and the fan speed can be adjusted arbitrarily without affecting each other.

[0032] S14, monitor the fan pressure ratio, adjust the outer throttle valve 31, make the fan pressure ratio the same or similar to that in the whole machine state, then adjust the inner throttle valve 51, and monitor the high-pressure compressor pressure ratio at the same time, make it the same or similar to that in the whole machine state, and then adjust the inner throttle valve 51 and the outer throttle valve 31 at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the control accuracy requirements.

[0033] In some embodiments of the present application, the fan pressure ratio or the high-pressure compressor pressure ratio can be regarded as the same or similar if it does not exceed 10% of the corresponding pressure ratio in the whole machine state.

[0034] S15, maintain the state of the biaxial compressor tester 100 stable, collect compressor parameters such as fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle, bypass ratio, etc. through the outer exhaust gas collecting device 30 and the inner exhaust gas collecting device 50 of the biaxial compressor tester 100, and this stable state is used as the basic state design point for the inner and outer rotor variable speed difference test.

[0035] S16, according to the fan and high-pressure compressor speed difference requirement under the whole machine state, the high-pressure compressor speed or the fan speed is adjusted at a predetermined interval. When the high-pressure compressor speed and the fan speed are stable, the compressor parameters such as the fan and high-pressure compressor flow rate, pressure ratio, efficiency, blade angle, and bypass ratio are collected, and then the next adjustment of the fan and high-pressure compressor speed difference and the collection of compressor parameters are performed.

[0036] For example, in this embodiment of the present application, the slip change process under the whole machine state is that the fan speed remains different, and the high-pressure compressor speed difference varies within the range of ±200rpm of the basic state design point. Therefore, the basic state design point speed can be changed at a speed interval of +100rpm, +200rpm at 100rpm, or at a speed interval of -100rpm, -200rpm at the basic state design point speed. After reaching the target speed, it stays at each speed for 1 minute. After the state point stabilizes, the compressor parameters are collected according to the process of step S15.

[0037] 2. The bypass ratio measurement process when changing the turbine guide vane area or adjusting the tail nozzle area is as follows: S21, determining control parameters under the whole machine state, wherein the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment rule, the high-pressure blade angle adjustment rule, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio.

[0038] S22, determining the control accuracy of the state control parameters during the test of the biaxial compressor tester.

[0039] There is no test control requirement for bypass ratio regulation using a dual-axis compressor tester in the prior art. This application determines, based on the single-axis compressor test standard and dual-axis compressor test experience, that the control accuracy of the fan converted speed and the high-pressure compressor converted speed is 0.2%, the fan and high-pressure compressor blade angle adjustment accuracy is 0.5°, and the fan and high-pressure compressor pressure ratio control accuracy is 0.3%.

[0040] S23, construct a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment rule, the high-pressure blade angle adjustment rule, etc., which is used to make the speed of the fan and the high-pressure compressor in a linkage mode during the test.

[0041] Before using the dual-axis compressor tester 100 for testing, first construct a control module, and input the fan and high-pressure compressor speed matching relationship, fan blade angle adjustment law, and high-pressure blade angle adjustment law in the whole machine state into the control module. During the test, the control module controls the high-pressure compressor speed, so that each device or device of the dual-axis compressor tester 100 can automatically operate according to the pre-input control law, and keep the fan and high-pressure compressor speeds unchanged after reaching the target speed.

[0042] S24, monitor the fan pressure ratio and adjust the outer throttle valve 31 to make the fan pressure ratio the same or similar to that in the whole machine state; then adjust the inner throttle valve 51 and monitor the high-pressure compressor pressure ratio at the same time to make it the same or similar to that in the whole machine state, and then adjust the inner throttle valve 51 and the outer throttle valve 31 at the same time to make the pressure ratio of the high-pressure compressor and the fan meet the control accuracy requirements.

[0043] In some embodiments of the present application, the fan pressure ratio or the high-pressure compressor pressure ratio can be regarded as the same or similar if it does not exceed 10% of the corresponding pressure ratio in the whole machine state.

[0044] S25, maintain the state of the biaxial compressor tester 100 stable, collect compressor parameters such as fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle, bypass ratio, etc. through the outer exhaust gas collecting device 30 and the inner exhaust gas collecting device 50 of the biaxial compressor tester 100. This stable state is used as the basic state design point when changing the turbine guide vane area or adjusting the tail nozzle area.

[0045] S26, according to the fan pressure ratio and high-pressure compressor pressure ratio adjusted by the turbine guide vane area or the tail nozzle area, the inner throttle valve 51 and the outer throttle valve 31 are adjusted at the same time, so that the fan pressure ratio and the high-pressure compressor pressure ratio are the same as those in the whole machine state, and after the state point is stable, the compressor parameters such as the fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle, bypass ratio, etc. are collected.

[0046] For example, in this embodiment of the present application, the internal throttle valve 51 and the external throttle valve 31 are adjusted simultaneously to make the fan pressure ratio and the high-pressure compressor pressure ratio the same as those in the whole machine state. The control accuracy requirement must also be met, and in the process of adjusting different pressure ratios, the state point stays for 1 minute after stabilization. After the state point is stable, the fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle, bypass ratio and other compressor parameters are collected according to step S25.

[0047] The structure of the dual-axis compressor tester 100 in the present application is the same as that of the turbofan engine, which can ensure the same hardware environment. In the process of using the dual-axis compressor tester 100 for testing, its bypass ratio is the ratio of the flow rate measured by the external exhaust gas collection device 50 to the flow rate measured by the internal exhaust gas collection device 30. The arrangement of the internal and external exhaust gas collection devices can be carried out in accordance with relevant standards, and the internal flow rate can also be obtained by subtracting the external flow rate from the total inlet flow rate. The method of the present application can realize the bypass ratio adjustment in a simulated whole machine environment, and the bypass ratio measurement can be realized by adjusting the bypass ratio individually or in combination through a variety of control means, without stopping the vehicle for hardware adjustment, which can effectively improve the test efficiency.

[0048] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for regulating bypass ratio under the condition of simulating a complete turbofan engine, characterized in that: Based on a biaxial compressor tester, the method comprises: Determine the control parameters under the whole machine state, the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment law, the high-pressure compressor blade angle adjustment law, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio; Determine the control accuracy of the test state control parameters of the biaxial compressor tester; Constructing a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment law and the high-pressure compressor blade angle adjustment law, and is used to make the speeds of the fan and the high-pressure compressor in a linkage mode during the test; Monitor the fan pressure ratio, adjust the outer throttle valve, make the fan pressure ratio the same or similar to that of the whole machine, then adjust the inner throttle valve, monitor the high-pressure compressor pressure ratio at the same time, make the high-pressure compressor pressure ratio the same or similar to that of the whole machine, and then adjust the inner throttle valve and the outer throttle valve at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the control accuracy requirements; Keep the state of the biaxial compressor tester stable, collect compressor parameters through the outer exhaust collection device and the inner exhaust collection device of the biaxial compressor tester, the compressor parameters include fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle and bypass ratio, and the stable state is used as the basic state design point of the inner and outer rotor variable speed difference test; According to the fan and high-pressure compressor speed difference requirements under the whole machine state, the high-pressure compressor speed or fan speed is adjusted according to the preset speed interval. When the high-pressure compressor speed and the fan speed are stable, the compressor parameters are collected, and then the next fan and high-pressure compressor speed difference adjustment and compressor parameters collection are carried out.

2. The bypass ratio control method under the condition of simulating a complete turbofan engine according to claim 1, characterized in that: Determine the control accuracy of the test state control parameters of the biaxial compressor tester including: The control accuracy of the converted speed of the fan and high-pressure compressor is determined to be 0.2%, the adjustment accuracy of the blade angle of the fan and high-pressure compressor is 0.5°, and the control accuracy of the pressure ratio of the fan and high-pressure compressor is 0.3%.

3. The bypass ratio control method under the condition of simulating a complete turbofan engine according to claim 1, characterized in that: When the fan and the high-pressure compressor reach the target rotational speeds, the linkage relationship between the fan and the high-pressure compressor rotational speeds is released.

4. The bypass ratio control method under the condition of simulating a complete turbofan engine according to claim 1, characterized in that: The same or similar means that the fan pressure ratio or the high-pressure compressor pressure ratio is no more than 10% of the corresponding pressure ratio under the whole machine state.

5. The bypass ratio control method under the condition of simulating a complete turbofan engine according to claim 1, characterized in that: The predetermined rotation speed interval does not exceed 100 rpm.

6. A method for regulating bypass ratio under simulated turbofan engine complete machine conditions, characterized in that: Based on a biaxial compressor tester, the method comprises: Determine the control parameters under the whole machine state, the control parameters include the speed matching relationship between the fan and the high-pressure compressor, the fan blade angle adjustment law, the high-pressure compressor blade angle adjustment law, the fan operating point pressure ratio, and the high-pressure compressor operating point pressure ratio; Determine the control accuracy of the test state control parameters of the biaxial compressor tester; Constructing a control module, which stores the speed matching relationship of the fan and the high-pressure compressor in the whole machine state, the fan blade angle adjustment law and the high-pressure compressor blade angle adjustment law, and is used to make the speeds of the fan and the high-pressure compressor in a linkage mode during the test; Monitor the fan pressure ratio, adjust the outer throttle valve, make the fan pressure ratio the same or similar to that of the whole machine, then adjust the inner throttle valve, monitor the high-pressure compressor pressure ratio at the same time, make the high-pressure compressor pressure ratio the same or similar to that of the whole machine, and then adjust the inner throttle valve and the outer throttle valve at the same time, so that the high-pressure compressor pressure ratio and the fan pressure ratio meet the control accuracy requirements; Keep the state of the biaxial compressor tester stable, collect compressor parameters through the outer exhaust gas collection device and the inner exhaust gas collection device of the biaxial compressor tester, the compressor parameters include fan and high-pressure compressor flow, pressure ratio, efficiency, blade angle and bypass ratio, the stable state is the basic state design point when changing the turbine guide vane area or adjusting the tail nozzle area; According to the fan pressure ratio and high-pressure compressor pressure ratio adjusted according to the turbine guide vane area or tail nozzle area, adjust the internal throttle valve and the external throttle valve at the same time to make the fan pressure ratio and the high-pressure compressor pressure ratio the same as those in the whole machine state, and collect the compressor parameters after the state point stabilizes.

7. The bypass ratio control method under the condition of simulating a complete turbofan engine according to claim 6, characterized in that: Determine the control accuracy of the test state control parameters of the biaxial compressor tester including: The control accuracy of the converted speed of the fan and high-pressure compressor is determined to be 0.2%, the adjustment accuracy of the blade angle of the fan and high-pressure compressor is 0.5°, and the control accuracy of the pressure ratio of the fan and high-pressure compressor is 0.3%.

8. The bypass ratio control method under the condition of simulating a complete turbofan engine as claimed in claim 6, characterized in that: The same or similar means that the fan pressure ratio or the high-pressure compressor pressure ratio is no more than 10% of the corresponding pressure ratio under the whole machine state.

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