A dual-axis compressor tester with same-side input and starting method thereof

Abstract

The present application provides a dual-axis compressor tester with same-side input and a starting method thereof, which belongs to the field of aero-engine test technology. The starting method comprises: during the starting process, the low-pressure shaft sleeve is inside the high-pressure shaft, and the high-pressure shaft realizes lubrication and cooling between the high-pressure and low-pressure shaft systems by throwing oil during the starting process, and the speed difference between the high-pressure shaft and the low-pressure shaft is determined by the lubrication requirement of the low-pressure shaft and the aerodynamic state requirement of the dual-axis compressor tester, thereby realizing lubrication and cooling between the high-pressure and low-pressure shaft systems; the minimum speed A of the high-pressure shaft required when the high-pressure shaft throws the minimum amount of lubricating oil is determined according to the lubrication requirement of the low-pressure shaft; while ensuring that the dual-axis compressor tester does not become unstable during the starting process, it is determined according to the aerodynamic state of the dual-axis compressor tester that the speed difference between the high-pressure shaft and the low-pressure shaft cannot exceed a given value, thereby determining the maximum speed B of the high-pressure shaft, that is, the starting speed N of the high-pressure shaft satisfies A≤N≤B.

Description

Technical Field

[0001] The present application belongs to the field of aero-engine testing, and in particular relates to a dual-axis compressor tester with same-side input and a starting method thereof. Background Art

[0002] In the process of aircraft engine compression system performance test research, the dual-axis compressor tester usually uses two motors as power input. Figure 1 The figure shows a schematic diagram of a dual-axis compressor tester with opposite-side input commonly used in the prior art, in which two motors (left motor and right motor) arranged on opposite sides are respectively connected to the high-pressure shaft and the low-pressure shaft of the dual-axis compressor through gear boxes, thereby driving the high- and low-pressure rotors to operate at a certain speed difference to simulate the operating state of the high- and low-pressure rotors of the dual-axis compressor.

[0003] However, the power sources of the high and low pressure rotors of a real twin-shaft compressor come from the same side. If a twin-shaft compressor layout with same-side input is adopted, the dual motors and their connected gearboxes need to be arranged on the same side. At the same time, since the high and low pressure shafts are driven on the same side using an outer sleeve and inner shaft, the shaft system has many fulcrums, a long span, and complex dynamic characteristics of the high and low pressure rotors. In addition, the test process requires the coordinated operation of auxiliary systems such as the intake / exhaust system, electrical system, lubrication system, test system, and angle adjustment. The speed control requirements of the high and low pressure rotors are high. If there are problems with the intake and exhaust, lubrication, and angle control, it will affect the stable operation of the twin-shaft compressor. Summary of the invention

[0004] The purpose of the present application is to provide a dual-axis compressor tester with same-side input and a starting method thereof, so as to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: the present application provides a method for starting a biaxial compressor tester with same-side input, comprising:

[0006] During the starting process, the low-pressure shaft sleeve is inside the high-pressure shaft. The high-pressure shaft realizes lubrication and cooling between the high-pressure and low-pressure shaft systems by throwing oil during the starting process. The speed difference between the high-pressure shaft and the low-pressure shaft is determined by the lubrication requirements of the low-pressure shaft and the aerodynamic state requirements of the dual-axis compressor tester, thereby realizing lubrication and cooling between the high-pressure and low-pressure shaft systems.

[0007] The minimum speed A of the high-pressure shaft required for the high-pressure shaft to dump the minimum amount of lubricating oil is determined according to the lubrication demand of the low-pressure shaft; while ensuring that the dual-axis compressor tester does not become unstable during the starting process, it is determined according to the aerodynamic state of the dual-axis compressor tester that the speed difference between the high-pressure shaft and the low-pressure shaft cannot exceed a given value, thereby determining the maximum speed B of the high-pressure shaft, that is, the high-pressure shaft starting speed N satisfies A≤N≤B.

[0008] Preferably, the method also includes a starting preparation process, during which each auxiliary system is prepared to meet the starting conditions of the dual-axis compressor tester, and each auxiliary system is ready including an intake system, an angle control system, an exhaust system, a lubrication system, a first motor and a second motor.

[0009] Preferably, the method also includes a starting monitoring process, during which various auxiliary systems are used to implement angle regularity monitoring, vibration amplitude monitoring, equipment parameter monitoring, high-pressure shaft and low-pressure shaft speed difference monitoring, and tester status point monitoring, so as to achieve normal starting of the dual-axis compressor tester and smoothly run it to the slow-running state, thereby avoiding overheating, stalling, and vibration failures.

[0010] On the other hand, the present application provides a biaxial compressor tester with same-side input, which is used to implement any of the above-mentioned starting methods for the biaxial compressor tester with same-side input, wherein the biaxial compressor tester includes: a compressor test piece, an intake system, an angle control system, an exhaust system, a gear box, a lubrication system, a first motor, and a second motor;

[0011] The compressor test piece includes a low-pressure compressor and a high-pressure compressor, wherein the low-pressure compressor and the high-pressure compressor are connected to a gearbox through a low-pressure shaft and a high-pressure shaft, respectively, and the first motor and the second motor are connected to the same gearbox for driving the low-pressure shaft and the high-pressure shaft to rotate, respectively;

[0012] The air intake system is arranged at the front side of the low-pressure compressor and is used to provide an air intake flow rate for the compressor test piece;

[0013] The exhaust system is arranged at the rear side of the high-pressure compressor and is used to discharge the gas flowing through the compressor test piece;

[0014] The angle control system is connected to the low-pressure compressor and is used to control the blade angle of the low-pressure compressor.

[0015] Preferably, the first motor and the second motor are motors of the same type.

[0016] Preferably, types of the first motor and the second motor include a stepper motor and a servo motor.

[0017] The biaxial compressor tester with same-side input and the starting method thereof provided in the present application have the following advantages:

[0018] 1) Solved the problem of multiple auxiliary systems under the layout conditions of the dual-axis compressor tester with the same-side input, and the problem of multiple auxiliary systems working together safely and smoothly;

[0019] 2) The problem of complex shaft system and difficulty in taking into account shaft system lubrication and speed control under the requirements of speed difference control under the layout conditions of the dual-axis compressor tester with the same-side input was solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 Schematic diagram of a biaxial compressor tester with opposite-side input in the prior art.

[0022] Figure 2 Schematic diagram of the biaxial compressor tester with same-side input in the present application.

[0023] Figure 3 Schematic diagram of the starting process of the dual-axis compressor tester with same-side input in the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] In order to achieve same-side input starting control of a dual-axis compressor tester, the present application provides a same-side input dual-axis compressor tester and a starting method thereof, which controls high and low pressure speeds, intake and exhaust, lubrication, angle, starting and other systems to achieve normal starting of the dual-axis compressor tester and smoothly run it to an idle state without causing overheating, stalling, excessive vibration and other faults, thereby obtaining appropriate auxiliary system regulation and high and low pressure speed control rules.

[0026] like Figure 2 As shown, the dual-axis compressor tester with same-side input includes a compressor test piece 1, an intake system 2, an angle control system 3, an exhaust system 4, a gear box 5, a lubrication system 6, a first motor 71, and a second motor 72.

[0027] The compressor test piece 1 includes a low-pressure compressor 11 and a high-pressure compressor 12, and the low-pressure compressor 11 and the high-pressure compressor 12 are respectively connected to the same gearbox 5 through a low-pressure shaft 13 (inner shaft) and a high-pressure shaft 14 (outer shaft), and the first motor 71 and the second motor 72 are both connected to the same gearbox 5, and are used to drive the low-pressure shaft 13 and the high-pressure shaft 14 to rotate respectively. In some embodiments of the present application, the first motor 71 and the second motor 72 are the same motor. Further, the first motor 71 and the second motor 72 can be a stepper motor or a servo motor in type to improve their control accuracy.

[0028] The air intake system 2 is arranged at the front side of the low-pressure compressor 11 to provide an air intake flow rate for the compressor test piece 1 .

[0029] The exhaust system 4 is disposed at the rear side of the high-pressure compressor 12 and is used to discharge the gas flowing through the compressor test piece 1 .

[0030] The angle control system 3 is connected to the low-pressure compressor 11 and is used to control the blade angle of the low-pressure compressor 11 .

[0031] Among them, the air intake system 2, the angle control system 3, the exhaust system 4, the lubrication system 6 and the two motors can constitute an auxiliary system.

[0032] like Figure 3 As shown, based on the above-mentioned dual-axis compressor tester with same-side input, the present application provides a method for starting the dual-axis compressor tester with same-side input. The method divides the starting of the dual-axis compressor tester with same-side input into three processes, namely, starting preparation, starting and starting monitoring. The method includes:

[0033] 1) During the start preparation process, ensure that all auxiliary systems are ready to meet the tester start conditions, including the intake system 2, the angle control system 3, the exhaust system 4, the lubrication system 6, the first motor 71, and the second motor 72.

[0034] 2) During the starting process, it is necessary to determine the control law of the high and low pressure shaft speeds. By running the first motor 71, the gear box 5 drives the high pressure compressor 12 to operate through the high pressure shaft 14, and then the second motor 72 is run, and the gear box 5 drives the low pressure compressor 11 to operate through the low pressure shaft 13. Since the low pressure shaft 13 is sleeved inside the high pressure shaft 14, the high pressure shaft 14 is used to operate the oil to throw away to solve the problem of shaft cooling and lubrication under the high and low pressure shaft layout conditions. The key technical point is to determine the speed difference when the high pressure shaft 14 runs before the low pressure shaft 13 at starting, and the speed difference between the high pressure shaft 14 and the low pressure shaft 13 is determined mainly considering the lubrication requirements of the low pressure shaft 13 and the aerodynamic state requirements of the dual-axis compressor tester.

[0035] Among them, according to the lubrication requirement of the low-pressure shaft 13 (ie, the minimum amount of lubricating oil), the minimum high-pressure shaft speed A required when the high-pressure shaft 14 throws off the minimum amount of lubricating oil can be calculated, that is, the high-pressure shaft starting speed N≥A.

[0036] The aerodynamic state requirements of the dual-axis compressor tester. In order to ensure that the dual-axis compressor tester does not become unstable during the startup process, it is necessary to ensure that the speed difference between the high-pressure shaft 14 and the low-pressure shaft 13 does not exceed a certain given value. Therefore, it can be calculated that the maximum speed B of the high-pressure shaft 14 is less than or equal to the given value.

[0037] Considering the lubrication requirements of the low-pressure shaft 13 and the pneumatic state requirements of the dual-axis compressor tester, the high-pressure shaft starting speed N satisfies A≤N≤B. Therefore, the high-pressure shaft speed at startup can be calculated based on the minimum speed A and the maximum speed B of the high-pressure shaft 14, thereby determining the speed control rules of the high and low-pressure shafts.

[0038] 3) During the startup monitoring, the dual-axis compressor tester can be started normally and run smoothly to the slow-running state through angle regularity monitoring, vibration amplitude monitoring, equipment parameter monitoring, high-pressure and low-pressure shaft speed difference monitoring, and tester status point monitoring, so as to avoid faults such as overheating, stalling, and excessive vibration.

[0039] The biaxial compressor tester with same-side input and the starting method thereof provided in the present application have the following advantages:

[0040] 1) Solved the problem of multiple auxiliary systems under the layout conditions of the dual-axis compressor tester with the same-side input, and the problem of multiple auxiliary systems working together safely and smoothly;

[0041] 2) The problem of complex shaft system and difficulty in taking into account shaft system lubrication and speed control under the requirements of speed difference control under the layout conditions of the dual-axis compressor tester with the same-side input was solved.

[0042] The present application provides appropriate auxiliary system regulation and high and low pressure speed control rules, and controls the starting high and low pressure speed, intake and exhaust, lubrication, angle, starting and other systems to achieve normal starting of the dual-axis compressor tester and smoothly run it to the slow-running state without overheating, stalling, excessive vibration and other faults.

[0043] 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 starting a biaxial compressor tester with same-side input, characterized in that: include: During the starting process, the low-pressure shaft sleeve is inside the high-pressure shaft. The high-pressure shaft realizes lubrication and cooling between the high-pressure and low-pressure shaft systems by throwing oil during the starting process. The speed difference between the high-pressure shaft and the low-pressure shaft is determined by the lubrication requirements of the low-pressure shaft and the aerodynamic state requirements of the dual-axis compressor tester, thereby realizing lubrication and cooling between the high-pressure and low-pressure shaft systems. The minimum speed A of the high-pressure shaft required for the high-pressure shaft to dump the minimum amount of lubricating oil is determined according to the lubrication demand of the low-pressure shaft; while ensuring that the dual-axis compressor tester does not become unstable during the starting process, it is determined according to the aerodynamic state of the dual-axis compressor tester that the speed difference between the high-pressure shaft and the low-pressure shaft cannot exceed a given value, thereby determining the maximum speed B of the high-pressure shaft, that is, the high-pressure shaft starting speed N satisfies A≤N≤B.

2. The method for starting a biaxial compressor tester with same-side input according to claim 1, characterized in that: It also includes a starting preparation process, during which each auxiliary system is prepared to meet the starting conditions of the dual-axis compressor tester. The auxiliary systems are prepared including an intake system, an angle control system, an exhaust system, a lubrication system, a first motor and a second motor.

3. The method for starting a biaxial compressor tester with same-side input as claimed in claim 2, characterized in that: It also includes a starting monitoring process, during which various auxiliary systems are used to implement angle regularity monitoring, vibration amplitude monitoring, equipment parameter monitoring, high-pressure shaft and low-pressure shaft speed difference monitoring, and tester status point monitoring, so as to achieve normal starting of the dual-axis compressor tester and smoothly run it to the slow-running state, avoiding overheating, stalling, and vibration failures.

4. A same-side input biaxial compressor tester, used to implement the same-side input biaxial compressor tester starting method as claimed in any one of claims 1 to 3, characterized in that: The biaxial compressor tester comprises: a compressor test piece, an air intake system, an angle control system, an exhaust system, a gear box, a lubrication system, a first motor and a second motor; The compressor test piece includes a low-pressure compressor and a high-pressure compressor, wherein the low-pressure compressor and the high-pressure compressor are connected to a gearbox through a low-pressure shaft and a high-pressure shaft, respectively, and the first motor and the second motor are connected to the same gearbox for driving the low-pressure shaft and the high-pressure shaft to rotate, respectively; The air intake system is arranged at the front side of the low-pressure compressor and is used to provide an air intake flow rate for the compressor test piece; The exhaust system is arranged at the rear side of the high-pressure compressor and is used to discharge the gas flowing through the compressor test piece; The angle control system is connected to the low-pressure compressor and is used to control the blade angle of the low-pressure compressor.

5. The same-side input biaxial compressor tester according to claim 4, characterized in that: The first motor and the second motor are motors of the same type.

6. The same-side input biaxial compressor tester according to claim 5, characterized in that: Types of the first motor and the second motor include a stepper motor and a servo motor.

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