Design method of combined compression system tester for simulating whole machine environment

Abstract

The invention provides a design method for a combined compression system tester for simulating a complete machine environment, and belongs to the technical field of aero-engine tests, and the method comprises the steps: determining the function requirements of a tester for a compression system test; determining key performance indexes of the tester based on the functional requirements of the tester; the structural design of the tester is carried out according to the functional requirements of the tester, and the structural forms of an air inlet system, an exhaust system, a transmission system and a power system in the tester are determined; determining materials and processing technologies of an air inlet system and an exhaust system in the tester according to the key performance indexes of the tester; and optimizing an air inlet system, an exhaust system, a transmission system and a power system in the tester. According to the design method of the combined compression system tester for simulating the whole machine environment, the structural design difficulty of the tester can be reduced, the argumentation and design period of a technical route and a scheme can be shortened, and the design and development efficiency can be improved.

Description

Technical Field

[0001] This application belongs to the field of aero-engine testing, and specifically relates to a design method for a combined compression system tester that simulates the overall engine environment. Background Technology

[0002] Performance testing of the aero-engine compression system is a crucial method for obtaining compression system performance data during engine development. During testing, the physical rotational speed of the compression system is calculated based on the ambient temperature and the converted rotational speed. After the power unit drives the compression system to the test speed, adjusting the flow area of ​​the exhaust throttle valve alters the outlet back pressure, thereby changing the test conditions. Performance parameters are recorded at corresponding points under each test condition, yielding test characteristics and performance under non-uniform inlet flow conditions such as pressure and temperature distortion, across several test points from maximum flow rate to the stable operating limit (surge point). Furthermore, by comparing the test performance with the design performance, the reasons for the discrepancies are identified, and targeted optimization design work is carried out on the compression system to obtain compression system performance that meets the engine's requirements, thus achieving overall performance compliance for the aero-engine.

[0003] Compressor test benches are crucial equipment for verifying and optimizing the performance of aero-engine compression components, while biaxial compressor test benches are key devices for studying the aerodynamic performance of engine compression systems. A biaxial compressor test bench can simulate the actual operating conditions of the entire compression system on an engine, enabling studies on the matching of high and low pressure compressors and transient performance. A biaxial compressor test bench typically includes an intake system, an exhaust system, a biaxial drive system, a multi-duct exhaust system, two sets of cooperating variable frequency drive systems, an electronic control system, a testing system, a lubrication system, a hydraulic system, and an air system. This biaxial compressor test bench is characterized by high shaft operating speeds and high exhaust pressures or temperatures, making its structure significantly more complex and its design significantly more challenging than traditional compressor test benches. The design of a biaxial compressor test bench involves multiple disciplines, including compression system testing processes, structural strength, machining processes, and electrical control. Only through effective collaboration among these disciplines during the design phase can a fully functional, structurally sound, and reliably stable combined compression system test bench simulating the entire engine environment be designed.

[0004] The current design and development process for compressor testing equipment typically involves project requirements assessment, preliminary design, technical review, detailed design, equipment fabrication, equipment installation, and equipment commissioning, all based on the internal quality management processes of each specialty. There is currently no systematic project development planning procedure or design methodology for the early requirements analysis and preliminary design stages of compressor testing equipment to ensure the orderly implementation of the design and avoid limitations in testing capabilities. Summary of the Invention

[0005] The purpose of this application is to provide a design method for a combined compression system tester that simulates the overall machine environment, in order to solve or mitigate at least one of the problems in the prior art.

[0006] The technical solution of this application is: a design method for a combined compression system tester simulating the overall machine environment, comprising:

[0007] Determine the functional requirements of the testing equipment used for compression system testing;

[0008] The key performance indicators of the tester are determined based on its functional requirements.

[0009] Based on the functional requirements of the tester, the structural design of the tester is carried out, and the structural forms of the air intake system, exhaust system, transmission system and power system in the tester are determined.

[0010] The materials and processing technology of the air intake system and exhaust system in the test equipment are determined based on the key performance indicators of the test equipment.

[0011] The air intake system, exhaust system, transmission system, and power system of the test apparatus are optimized to obtain the final test apparatus.

[0012] In a preferred embodiment of this application, the key performance indicators of the tester include: intake air flow rate, pressure, temperature, required number of transmission shafts, rated power and speed of the power system, operating speed range of the transmission system, number of exhaust system channels and exhaust temperature and pressure of each exhaust channel, axial force balancing capability, and expiratory air system flow rate and number of channels.

[0013] In a preferred embodiment of this application, the process for determining the air intake flow rate, pressure, and temperature of the test apparatus is as follows:

[0014] Based on the air intake capacity requirements of the test object, determine the maximum air intake mass flow rate G of the test apparatus. max Based on the power capacity limitations of the power system, determine whether the intake system should implement intake throttling and the maximum throttling ratio K, according to G=K•G max Determine the maximum mass flow rate G of the test apparatus; determine the inlet pressure and temperature of the test apparatus based on its inlet pressurization, heating and cooling requirements;

[0015] The process for determining the required number of transmission shafts for the testing apparatus is as follows: Based on the functional requirements of the testing apparatus, determine whether the transmission system is in single-shaft or dual-shaft mode. When the functional requirement of the testing apparatus is single-shaft mode, the transmission system of the testing apparatus is arranged in a single-shaft manner; if the functional requirement of the testing apparatus is dual-shaft mode, the transmission system of the testing apparatus is designed to have dual-shaft power input capability.

[0016] The process for determining the rated power and speed of the power system of the test apparatus is as follows: Based on the flow rate, pressure ratio, efficiency, and transmission efficiency of the test object, the power requirement P of the test object is calculated using the following formula:

[0017]

[0018] In the formula, W is the estimated maximum mass flow rate of the test object;

[0019] The total temperature of the inlet gas of the test object;

[0020] γ is the specific heat ratio;

[0021] R is the air gas constant;

[0022] The estimated maximum boost ratio for the test subject;

[0023] To improve the efficiency of the compression system;

[0024] For the mechanical transmission efficiency of the transmission system;

[0025] Based on the calculated power demand P of the test object, and combined with the power demand reduced by intake throttling, the final power index of the test instrument is determined.

[0026] A multi-stage synchronous motor is used as the power equipment for the test instrument, and the design speed of the multi-stage synchronous motor is the speed of the power system.

[0027] The process for determining the operating speed range of the transmission system is as follows: the speed range of the test instrument's transmission system is determined based on the highest and lowest speed requirements of the test object.

[0028] The process for determining the number of exhaust system channels and the exhaust temperature and pressure of each exhaust channel is as follows: the number of exhaust channels is determined according to the structural characteristics of the test object, and the number of exhaust channels shall not exceed 3; the temperature and pressure resistance design indicators of the corresponding exhaust channels are determined according to the maximum exhaust pressure and temperature of the test object on each branch of the exhaust channel.

[0029] The process of determining the axial force balancing capability is as follows: evaluate the magnitude of the axial force of the test object rotor and the test object's autonomous axial force balancing capability, and determine whether the test bench needs to provide axial force balancing function and balancing value based on the magnitude of the axial force of the test object rotor and the test object's autonomous axial force balancing capability.

[0030] The process for determining the flow rate and number of channels of the induced draft system is as follows: the induced draft flow rate measurement requirements and the number of induced draft pipes of the test bench are determined based on the ratio of the total inlet flow rate and the maximum outlet flow rate of the test object.

[0031] In a preferred embodiment of this application, the structural design of the testing instrument is carried out according to the functional requirements of the testing instrument, including:

[0032] The overall structural layout of the test apparatus and the assembly relationship between the test object and each test device in the test apparatus are determined based on the structural characteristics of the test object and the functional requirements of the test apparatus.

[0033] The structural form of the intake system is determined based on the functional requirements and key performance indicators of the intake system. The structural form of the intake system includes whether it has intake heating, pressurization, and throttling functions, and whether it reserves space for the installation of intake pressure distortion and temperature distortion equipment.

[0034] The structural form of the exhaust system is determined based on the functional requirements and key performance indicators of the exhaust system. The structural form of the exhaust system includes the number of exhaust channels, the structural form of the exhaust throttle valve, the support method of the exhaust equipment, and the location of the dead point.

[0035] Based on the power and speed requirements of the test object, the power and speed operating envelope of the power system is plotted, and the power motor and the frequency conversion drive system matched with the power motor are determined based on the envelope.

[0036] In a preferred embodiment of this application, the process of determining the materials and processing technology of the air intake system and exhaust system in the test apparatus based on the key performance indicators of the test apparatus includes:

[0037] For the air intake system in the testing apparatus, low-carbon steel is selected as the material for the air intake system under normal temperature air intake conditions; stainless steel is selected as the material for the air intake system that requires air intake heating and pressurization; the air intake flow pipe in the air intake system is selected with a thermal expansion coefficient of (5~10)×10. -6 The material of / K is manufactured using an integral casting process; the cylindrical structural components in the intake system are manufactured using sheet metal welding.

[0038] For the exhaust system in the test apparatus, key components with an operating temperature not exceeding 350℃ should be made of cast steel or ductile iron; key components with an operating temperature between 350℃ and 550℃ should be made of heat-resistant stainless steel; and key components with an operating temperature between 550℃ and 850℃ should be made of high-temperature alloy.

[0039] Exhaust passages, exhaust throttling valves, and exhaust volutes with pressure requirements are manufactured using casting processes, while volutes with pressure not exceeding 5 bar are manufactured using sheet metal welding processes.

[0040] The design method of the combined compression system tester simulating the whole machine environment in this application provides a relatively clear process route in the design of complex compression system test equipment, reduces the difficulty of tester structure design, shortens the demonstration and design cycle of technical route and scheme, and improves design and development efficiency. Attached Figure Description

[0041] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0042] Figure 1 This is a schematic diagram of the design method for a combined compression system tester simulating a complete machine environment according to this application.

[0043] Figure 2 This is a schematic diagram of the structural layout of a test equipment for a power input-type combined compression system according to an embodiment of this application.

[0044] Figure 3 This is a typical power envelope diagram of a motor-driven tester according to an embodiment of this application. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0046] This application provides a design method for a combined compression system tester that simulates the overall machine environment. By designing complex compression system test equipment based on functional requirements, a relatively clear process route can be generated, reducing the difficulty of functional design and development of the compressor tester, shortening the demonstration and design cycle of the technical solution, and improving design and development efficiency.

[0047] like Figure 1 As shown, the design method for a combined compression system tester simulating a complete machine environment provided in this application includes the following steps:

[0048] S10, Determine the functional requirements of the tester used for compression system testing.

[0049] The functional requirements of this testing equipment typically include the following:

[0050] 1) Capable of performing compression system performance assessments under uniform intake conditions;

[0051] 2) Capable of recording compression system performance under simulated engine intake conditions (including intake air heating or pressurization, intake pressure distortion or temperature distortion);

[0052] 3) Capable of conducting performance matching characteristic tests on high and low pressure components of a compression system;

[0053] 4) Capable of conducting transient state test performance studies of compression systems;

[0054] 5) Capable of studying the acoustic, gas, and solid coupling mechanism within a compression system;

[0055] 6) Capable of conducting acoustic performance tests on compression systems.

[0056] S20, determine the key performance indicators of the tester based on its functional requirements.

[0057] The key performance indicators of this testing equipment typically include:

[0058] 1) Intake airflow, pressure, and temperature:

[0059] 1.1) Based on the air intake capacity requirements of the test object (i.e., the compression system test piece), the maximum air intake mass flow rate G of the test apparatus is initially determined. max ;

[0060] 1.2) Based on the functional requirements of the test apparatus, such as air inlet pressurization, heating and cooling, determine its design parameters such as air inlet pressure and temperature;

[0061] 1.3) Based on the power capacity limitations of the power system, determine whether the intake system requires intake throttling and the required maximum throttling ratio K, using G=K*G. max The maximum mass flow rate G that the evaluation test equipment should have is determined.

[0062] 2) Required number of transmission shafts:

[0063] The transmission system is determined to be either single-axis or dual-axis based on the functional requirements of the tester. When the functional requirement of the tester is single-axis, the transmission system of the tester is arranged in a single-axis manner; if the functional requirement of the tester is dual-axis, the transmission system of the tester is designed to have dual-axis power input capability.

[0064] 3) Rated power and speed of the power system:

[0065] Based on parameters such as the flow rate, pressure ratio, efficiency, and transmission efficiency of the test instrument, the power requirement P of the test instrument is calculated using Formula 1:

[0066] (1)

[0067] In the formula, W is the estimated maximum mass flow rate of the test object, in kg / s;

[0068] The total temperature of the inlet gas of the test object, in K;

[0069] γ is the specific heat ratio; at room temperature, the specific heat ratio of air is γ = 1.4.

[0070] R is the gas constant for air, R = 287.06, with units of J / (kg·K);

[0071] The estimated maximum boost ratio for the test subject;

[0072] To improve the efficiency of the compression system;

[0073] The mechanical transmission efficiency of the transmission system.

[0074] Based on the calculated power requirement P of the test object, and considering economic factors and the possibility of reducing the power requirement by intake throttling (i.e. reducing the maximum mass flow rate W in Formula 1 by throttling), the final power index of the test device is determined.

[0075] Multi-stage synchronous motors are more suitable as power equipment for testing equipment. The design speed of a multi-stage synchronous motor is the power system speed. For example, if a multi-stage synchronous motor is a 4-stage synchronous motor with a speed of 1500 rpm, then this speed can be used as the power system speed.

[0076] 4) Operating speed range of the transmission system:

[0077] The speed range of the tester's transmission system is determined based on the maximum and minimum speed requirements of the test object.

[0078] 5) Number of exhaust system channels and exhaust temperature and pressure of each channel:

[0079] The number of exhaust channels is determined based on the structural characteristics of the test object, and usually does not exceed 3.

[0080] The temperature and pressure resistance design parameters of the corresponding exhaust channels are determined based on the maximum exhaust pressure and temperature of each branch of the exhaust channel for the test object. These temperature and pressure resistance design parameters are the exhaust temperature and pressure of the exhaust channel.

[0081] 6) Axial force balancing capability:

[0082] The magnitude of the axial force on the rotor of the test object and the test object's autonomous axial force balancing ability are evaluated. Based on the former two, it is determined whether the test bench needs to provide axial force balancing function and balancing value.

[0083] 7) Air intake system flow rate and number of channels:

[0084] The test objects usually have intermediate venting function. Therefore, the venting flow measurement requirements of the test bench and the number of venting pipes can be determined according to the ratio of the total inlet flow rate of the test object to the possible maximum venting flow rate.

[0085] S30. Based on the functional requirements of the tester, the structural design of the tester is carried out, and the structural forms of the air intake system, exhaust system, transmission system and power system in the tester are determined.

[0086] Choose a structural form suitable for realizing the various functional components of the testing instrument, such as the air intake system, exhaust system, transmission system, and power system:

[0087] 1) Determine the overall structural layout of the test apparatus and the assembly relationship between the test apparatus and each test device based on the structural characteristics of the test object and the functional requirements of the test apparatus.

[0088] For combined compression systems designed to simulate a complete machine environment, a structural layout with input shafts on the same side is more suitable for the various test equipment, such as... Figure 1 As shown, the test equipment includes an intake pipe 1, an exhaust pipe 2, a coaxial gearbox 3, a single-stage speed-increasing gearbox 4, and a power motor 5. The intake pipe 1 constitutes the intake system, the exhaust pipe 2 constitutes the exhaust system, the coaxial gearbox 3 and the single-stage speed-increasing gearbox 4 constitute the transmission system, and the power motor 5 constitutes the power system.

[0089] The test object and the exhaust pipe 2 of the test equipment are directly connected and assembled to achieve shaft alignment by means of the positioning stop, which can ensure the reliable connection of each test equipment when the combined compression system is used for high temperature and high pressure exhaust test in the simulated whole machine environment.

[0090] 2) Determine the structural form of the intake system based on its functional requirements and key performance indicators, including whether it has functions such as intake heating, pressurization, and throttling, and whether it has reserved space for the installation of equipment for intake pressure distortion and temperature distortion. The intake system should comply with the requirements of aviation standard HB7115. The intake system of the combined compression system test apparatus for simulating the whole machine environment should have the following equipment or functions:

[0091] a) The intake system should be installed on the axial guide rail to facilitate axial movement of the intake system and to match test objects with different axial lengths;

[0092] b) The air intake system should have a date-shaped pressure stabilizing box for intake rectification to ensure that the intake air quality meets the requirements of aviation standard HB7115;

[0093] c) Sufficient axial adjustment space should be reserved at the front of the pressure regulator box of the intake system for installing equipment such as intake pressure distortion or temperature distortion, intake heating or pressurization;

[0094] d) The intake flow measurement equipment should be subdivided into different measurement groups to cover the entire flow measurement range and ensure the measurement accuracy within the flow measurement range.

[0095] 3) Determine the structural form of the exhaust system based on its functional requirements and key performance indicators, including the number of exhaust channels (including single duct, double duct, and triple duct), the structural form of the exhaust throttle valve, the support method of the exhaust equipment, and the location of the dead point.

[0096] a) Based on the technological development trend of aero-engines, the test vehicle should preferentially select a three-duct exhaust structure;

[0097] b) Where the structure allows, the exhaust channel support structure should preferably use an integrated support base structure, which has higher support reliability and is more convenient for equipment installation and adjustment;

[0098] c) Set axial and radial positioning locking points on the exhaust channel support to realize outward thermal expansion displacement with the positioning locking points as the reference position during the operation of the test equipment;

[0099] d) The throttle valve of the exhaust system should be positioned closer to the exhaust port of the test object in order to reduce the exhaust volume and improve the response sensitivity of the exhaust throttle valve to the test state.

[0100] e) In applications with high exhaust flow and low exhaust pressure, louvered throttling valves should be used first; in applications with low flow and high exhaust pressure, plug valves should be used first.

[0101] 4) Based on the power and speed requirements of the test object, draw the power and speed operating envelope of the power system, and select a suitable power motor and a matching frequency conversion drive system based on the envelope.

[0102] The power motor should have the characteristics of constant torque output below the design speed and constant power output above the design speed, such as... Figure 3 As shown.

[0103] Based on the functional requirements of the transmission system, determine its structural form, including single-shaft / dual-shaft modes, and whether it includes an exhaust channel shaft, etc.

[0104] The arrangement of the dual-shaft drive system of the combined compression system is determined based on the overall equipment layout of the testing apparatus, such as... Figure 2 As shown.

[0105] The speed increase ratio of the transmission system is determined based on the maximum speed of the power system and the maximum speed requirement of the test object.

[0106] Determine the appropriate number of gear speed increase stages based on the power rating and speed increase ratio data of the transmission system.

[0107] The structural form of the shaft transmission connection between the two is determined based on the structural form of the test object and the structural form of the transmission system (either the two shafts are directly connected or indirectly connected by arranging the shafts in the exhaust channel as a bridge).

[0108] S40, determine the materials and processing technology of the intake and exhaust systems in the tester based on the key performance indicators of the tester.

[0109] 1) Intake system material selection

[0110] The air intake system of the test apparatus under normal temperature air intake conditions is made of low carbon steel.

[0111] For test chambers requiring air intake heating and pressurization, stainless steel is the preferred material for the air intake system.

[0112] The intake flow pipe should have a low coefficient of thermal expansion (e.g., CTE approximately 10). -6 The material ( / K) is made using a one-piece casting process.

[0113] The cylindrical structural components in the intake system are manufactured using sheet metal welding.

[0114] 2) Exhaust system material selection

[0115] Key components such as exhaust passages, exhaust throttling valves, and volutes at lower operating temperatures (usually not exceeding 350℃) are made of materials such as cast steel and ductile iron.

[0116] Key components such as the exhaust passage, exhaust throttling valve, and volute housing, which operate at higher temperatures (350℃~550℃), are made of heat-resistant stainless steel.

[0117] High-temperature alloy materials are selected for key components such as exhaust passages, exhaust throttling valves, and volutes that operate at high temperatures (550℃~850℃).

[0118] Exhaust passages, exhaust throttling valves, and exhaust volutes with pressure requirements are manufactured using casting processes, while volutes with lower pressure requirements (e.g., not exceeding 5 bar) are manufactured using sheet metal welding processes.

[0119] S50. After the manufacturing materials of each intake and exhaust system of the tester are determined, the equipment structure of each subsystem is optimized according to the processing characteristics of each subsystem to adapt to the material characteristics, and the tester is finally obtained.

[0120] Among them, the pressure resistance, structural strength, and stiffness of the inlet and outlet pipe cavities of the tester are calculated and verified, and the structure is optimized based on the results;

[0121] In the transmission system, rotor dynamics calculations of the transmission shaft system are performed, and the shaft support structure is optimized based on the calculation results.

[0122] Evaluation of the thermal expansion compensation capability of the test object, intake / exhaust housing and drive shaft system; optimization of the axial compensation function of the compressor tester based on the thermal expansion compensation capability.

[0123] The process of equipment installation and shaft alignment is evaluated, and the support system is optimized in the direction of simplifying the installation process and improving the stability of support adjustment.

[0124] The design method of the combined compression system tester simulating the whole machine environment in this application provides a relatively clear process route in the design of complex compression system test equipment, reduces the difficulty of tester structure design, shortens the demonstration and design cycle of technical route and scheme, and improves design and development efficiency.

[0125] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A design method for a combined compression system test apparatus simulating a complete machine environment, characterized in that, include: Determine the functional requirements of the testing equipment used for compression system testing; The key performance indicators of the tester are determined based on its functional requirements. Based on the functional requirements of the tester, the structural design of the tester is carried out, and the structural forms of the air intake system, exhaust system, transmission system and power system in the tester are determined. The materials and processing technology of the air intake system and exhaust system in the test equipment are determined based on the key performance indicators of the test equipment. The air intake system, exhaust system, transmission system, and power system of the test apparatus are optimized to obtain the final test apparatus.

2. The design method for a combined compression system tester simulating a complete machine environment as described in claim 1, characterized in that, The key performance indicators of the tester include: intake air flow rate, pressure, temperature, required number of transmission shafts, rated power and speed of the power system, operating speed range of the transmission system, number of exhaust system channels and exhaust temperature and pressure of each exhaust channel, axial force balancing capability, and expiratory air system flow rate and number of channels.

3. The design method for a combined compression system tester simulating a complete machine environment as described in claim 2, characterized in that, The process for determining the airflow rate, pressure, and temperature of the test apparatus is as follows: Based on the air intake capacity requirements of the test object, determine the maximum air intake mass flow rate G of the test apparatus. max Based on the power capacity limitations of the power system, determine whether the intake system should implement intake throttling and the maximum throttling ratio K, according to G=K•G max Determine the maximum mass flow rate G of the test apparatus; determine the inlet pressure and temperature of the test apparatus based on its inlet pressurization, heating and cooling requirements; The process for determining the required number of transmission shafts for the testing apparatus is as follows: Based on the functional requirements of the testing apparatus, determine whether the transmission system is in single-shaft or dual-shaft mode. When the functional requirement of the testing apparatus is single-shaft mode, the transmission system of the testing apparatus is arranged in a single-shaft manner; if the functional requirement of the testing apparatus is dual-shaft mode, the transmission system of the testing apparatus is designed to have dual-shaft power input capability. The process for determining the rated power and speed of the power system of the test apparatus is as follows: Based on the flow rate, pressure ratio, efficiency, and transmission efficiency of the test object, the power requirement P of the test object is calculated using the following formula: In the formula, W is the estimated maximum mass flow rate of the test object; The total temperature of the inlet gas of the test object; γ is the specific heat ratio; R is the air gas constant; The estimated maximum boost ratio for the test subject; To improve the efficiency of the compression system; For the mechanical transmission efficiency of the transmission system; Based on the calculated power demand P of the test object, and combined with the power demand reduced by intake throttling, the final power index of the test instrument is determined. A multi-stage synchronous motor is used as the power equipment for the test instrument, and the design speed of the multi-stage synchronous motor is the speed of the power system. The process for determining the operating speed range of the transmission system is as follows: the speed range of the test instrument's transmission system is determined based on the highest and lowest speed requirements of the test object. The process for determining the number of exhaust system channels and the exhaust temperature and pressure of each exhaust channel is as follows: the number of exhaust channels is determined according to the structural characteristics of the test object, and the number of exhaust channels shall not exceed 3; the temperature and pressure resistance design indicators of the corresponding exhaust channels are determined according to the maximum exhaust pressure and temperature of the test object on each branch of the exhaust channel. The process of determining the axial force balancing capability is as follows: evaluate the magnitude of the axial force of the test object rotor and the test object's autonomous axial force balancing capability, and determine whether the test bench needs to provide axial force balancing function and balancing value based on the magnitude of the axial force of the test object rotor and the test object's autonomous axial force balancing capability. The process for determining the flow rate and number of channels of the induced draft system is as follows: the induced draft flow rate measurement requirements and the number of induced draft pipes of the test bench are determined based on the ratio of the total inlet flow rate and the maximum outlet flow rate of the test object.

4. The design method for a combined compression system tester simulating a complete machine environment as described in claim 3, characterized in that, The structural design of the testing apparatus is carried out according to the functional requirements of the testing apparatus, including: The overall structural layout of the test apparatus and the assembly relationship between the test object and each test device in the test apparatus are determined based on the structural characteristics of the test object and the functional requirements of the test apparatus. The structural form of the intake system is determined based on the functional requirements and key performance indicators of the intake system. The structural form of the intake system includes whether it has intake heating, pressurization, and throttling functions, and whether it reserves space for the installation of intake pressure distortion and temperature distortion equipment. The structural form of the exhaust system is determined based on the functional requirements and key performance indicators of the exhaust system. The structural form of the exhaust system includes the number of exhaust channels, the structural form of the exhaust throttle valve, the support method of the exhaust equipment, and the location of the dead point. Based on the power and speed requirements of the test object, the power and speed operating envelope of the power system is plotted, and the power motor and the frequency conversion drive system matched with the power motor are determined based on the envelope.

5. The design method for a combined compression system tester simulating a complete machine environment as described in claim 4, characterized in that, The process of determining the materials and processing technology of the air intake and exhaust systems in the testing equipment based on the key performance indicators of the testing equipment includes: For the air intake system in the testing apparatus, low-carbon steel is selected as the material for the air intake system under normal temperature air intake conditions; stainless steel is selected as the material for the air intake system that requires air intake heating and pressurization; the air intake flow pipe in the air intake system is selected with a thermal expansion coefficient of (5~10)×10. -6 The materials for the / K are manufactured using an integral casting process; the cylindrical structural components in the intake system are manufactured using sheet metal welding. For the exhaust system in the test apparatus, key components with an operating temperature not exceeding 350℃ should be made of cast steel or ductile iron; key components with an operating temperature between 350℃ and 550℃ should be made of heat-resistant stainless steel; and key components with an operating temperature between 550℃ and 850℃ should be made of high-temperature alloy. Exhaust passages, exhaust throttling valves, and exhaust volutes with pressure requirements are manufactured using casting processes, while volutes with pressure not exceeding 5 bar are manufactured using sheet metal welding processes.

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