An experimental starting device and method for an adaptive variable cycle compression system

Abstract

An experimental starting device for an adaptive variable cycle compression system of the present application. The device includes a throttle valve, a cooler, a vacuum pump and a motor. Among them, the throttle valve is arranged at the rear side of the exhaust volute forming the third bypass duct and is connected to the cooler and the vacuum pump through pipelines. The vacuum pump is connected to the motor, and the motor drives the vacuum pump to operate. After the vacuum pump operates, a negative pressure is formed at the rear end of the exhaust volute, so that the third bypass duct can exhaust independently. The experimental starting device for the adaptive variable cycle compression system provided by the present application forms a suction structure. The device can form suction indexes matching the starting requirements of the adaptive variable cycle compression system according to different structures and starting performance requirements of the adaptive variable cycle compression system, so as to ensure the safe starting of the adaptive variable cycle compression system.

Description

Technical Field

[0001] This application belongs to the technical field of variable cycle engine tests, and particularly relates to a test starting device for an adaptive variable cycle compression system. Background Art

[0002] The compression system is a key component of an aeroengine. As shown in the schematic diagram of a conventional fan structure Figure 1 as shown, the fan sequentially includes adjustable guide vanes IGV, rotor blades R1 - R3 and stator blades S1 - S3 arranged at intervals along the air flow direction. According to different requirements of the aeroengine, the number of stages and bypass ratio of the fan are different. A splitter ring 11 is arranged after the stator blade S3, and the splitter ring 11 divides the duct into a fan core duct 12 and a fan bypass duct 13. As shown in Figure 2 as shown, for the test starting method of a conventional fan: adjust the angles of the stator blades S - S3 to the automatic control mode with the speed, adjust the throttle valves after the fan core duct 12 and the fan bypass duct 13 to the fully open state, adjust the throttle valve at the fan inlet to the fully open state, set the starting speed to the idle speed, and press the "start" button to complete the starting operation of the conventional fan.

[0003] With the development of aeroengines towards the adaptive variable cycle direction, the compression system now has the adaptive variable cycle function. As shown in the schematic diagram of an adaptive fan Figure 3 as shown, the adaptive fan 20 includes a front fan 21 and a rear fan 22. There is a third flow path 23 between the front fan 21 and the rear fan 22. The flow path behind the rear fan 22 forms an outer duct 24 and an inner duct 25 through a splitter ring. The rear fan 22 can exhaust through the inner duct 25 or exhaust through both the inner and outer ducts together; while the front fan 21 exhausts through the third duct 23 and the inner and outer ducts. However, the exhaust pressure of the third duct 23 is low and the exhaust loss is large, which makes it impossible for the third duct 23 to exhaust independently. When using the conventional fan starting method in the prior art to conduct the starting test of the adaptive fan, it will cause situations such as instability, surge or inability to start of the adaptive fan, resulting in structural damage to the adaptive fan. Summary of the Invention

[0004] The purpose of this application is to provide a test starting device and method for an adaptive variable cycle compression system to solve or mitigate at least one problem in the background art.

[0005] The technical solution of this application is: a test starting device for an adaptive variable cycle compression system, the device includes a throttle valve, a cooler, a vacuum pump and a motor. Among them, the throttle valve is arranged behind the exhaust volute forming the third duct and is connected to the cooler and the vacuum pump through a pipeline. The vacuum pump is connected to the motor, and the motor drives the vacuum pump to operate. After the vacuum pump operates, a negative pressure is formed at the rear end of the exhaust volute, so that the third duct can exhaust independently.

[0006] Further, the vacuum pump is a water-ring vacuum pump.

[0007] On the other hand, the technical solution provided by this application is: a test starting method for an adaptive variable cycle compression system, which uses the test starting device for an adaptive variable cycle compression system described above. The test starting method includes:

[0008] According to the design requirements of the adaptive variable cycle compression system, determine the designed exhaust gas flow value of the third bypass duct in the test starting state of the adaptive variable cycle compression system;

[0009] According to the designed exhaust gas flow value, determine the specification model of the test starting device, so that the suction flow formed after the test starting device is connected to the adaptive variable cycle compression system is not lower than the designed exhaust gas flow value;

[0010] According to the designed exhaust gas flow value of the third bypass duct in the test starting state of the adaptive variable cycle compression system and the suction flow of the test starting device connected to the adaptive variable cycle compression system, determine the states of the components of the test starting device;

[0011] Start the motor in the test starting device to drive the vacuum pump to work, and adjust the motor speed to adjust the speed of the vacuum pump to the speed required by the third bypass duct in the starting state, so as to provide a suction flow that meets the requirements;

[0012] Start the adaptive variable cycle compression system to complete the start of the adaptive variable cycle compression system.

[0013] Further, the states of the components of the test starting device include: the valve opening of the throttle valve, the cooling flow of the cooler, and the speed of the motor or the vacuum pump.

[0014] Further, the speed of the motor is adjusted by a frequency converter.

[0015] The test starting device for an adaptive variable cycle compression system provided by this application forms a suction structure. This device can form a suction index that matches the starting requirements of the adaptive variable cycle compression system according to the different structures and starting performance requirements of the adaptive variable cycle compression system, so as to ensure the safe start of the adaptive variable cycle compression system.

[0016] This method determines the designed exhaust gas flow value of the third bypass duct in the starting state, and then determines the suction capacity of the suction structure. By adjusting the motor speed with a frequency converter, the working state of the vacuum pump can meet the starting requirements of the adaptive variable cycle compression system, and it can adapt to the arbitrarily adjustable state of the third bypass duct and meet the starting requirements of different adaptive variable cycle compression systems. Description of the Drawings

[0017] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application.

[0018] Figure 1 It is a schematic diagram of a conventional fan structure in the prior art.

[0019] Figure 2 It is a schematic diagram of the starting process of a conventional fan in the prior art.

[0020] Figure 3 It is a schematic diagram of the structure of an adaptive variable cycle fan.

[0021] Figure 4 It is a schematic diagram of the connection between an adaptive variable cycle fan and a test starting device.

[0022] Figure 5 It is a schematic diagram of the starting process of an adaptive variable cycle fan. Detailed implementation manners

[0023] 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 accompanying drawings in the embodiments of this application.

[0024] To solve the technical problem that the existing test starting method for a compression system cannot meet the requirement that the third bypass duct of an adaptive variable cycle compression system cannot exhaust independently, resulting in the instability of the starting of the adaptive variable cycle compression system and structural damage, this application provides a test starting device and method for an adaptive variable cycle compression system.

[0025] As Figure 4 shown, the test starting device for an adaptive variable cycle compression system provided in this application, the device 30 includes a throttle valve 31, a cooler 32, a vacuum pump 33 and a motor 34. The throttle valve 31 is arranged behind the exhaust volute 231 forming the third bypass duct 23, and is connected to the cooler 32 and the vacuum pump 33 through pipelines. The vacuum pump 33 is connected to the motor 34. The motor 34 drives the vacuum pump 33 to operate. After the vacuum pump 33 operates, a negative pressure is formed at the rear end of the exhaust volute 231, so that the third bypass duct 23 can exhaust independently.

[0026] In an embodiment of this application, the above-mentioned vacuum pump is a water-ring vacuum pump.

[0027] As Figure 5 shown, this application also provides a test starting method for an adaptive variable cycle compression system. This method is implemented on the basis of the test starting device and method for a conventional compression system, in combination with the above-mentioned test starting device for an adaptive variable cycle compression system. The specific process includes:

[0028] S1. Prepare systems such as the rotational speed control, angle control, intake throttle control, and exhaust throttle control of the compression system according to the requirements for the test start of the adaptive variable cycle compression system.

[0029] S2. Determine the designed exhaust gas flow value of the third bypass duct under the test start state of the adaptive variable cycle compression system according to the design requirements of the adaptive variable cycle compression system.

[0030] S3. Determine the specification model of the test start device according to the designed exhaust gas flow value, so that the suction flow formed after the test start device is connected to the adaptive variable cycle compression system test is not lower than the designed exhaust gas flow value.

[0031] S4. Determine the valve state (opening degree) of the throttle valve 31, the cooler state (cooling flow rate), and the motor / vacuum pump state (rotational speed) in the test start device according to the designed exhaust gas flow value of the third bypass duct under the test start state of the adaptive variable cycle compression system and the suction flow after the test start device is connected to the adaptive variable cycle compression system.

[0032] S5. Start the motor 34 to drive the vacuum pump 33 to work, and adjust the rotational speed of the motor 34 to adjust the rotational speed of the vacuum pump 33 to the rotational speed required by the third bypass duct in the start state, so as to provide a suction flow that meets the requirements.

[0033] S6. Press the "Start" button to start the adaptive variable cycle compression system, and pay attention to the working state of the vacuum pump and the state, stability, vibration situation, etc. of the compression system during the start process.

[0034] The test start device for the adaptive variable cycle compression system provided by this application forms a suction structure. This device can form suction indexes matching the start requirements of the adaptive variable cycle compression system according to the different structures and start performance requirements of the adaptive variable cycle compression system, so as to ensure the safe start of the adaptive variable cycle compression system.

[0035] This method determines the designed exhaust gas flow value of the third bypass duct in the start state, and then determines the suction capacity of the suction structure. By adjusting the rotational speed of the motor through the frequency converter, the working state of the vacuum pump can meet the start requirements of the adaptive variable cycle compression system, and it can adapt to the arbitrarily adjustable state of the third bypass duct and the start requirements of different adaptive variable cycle compression systems.

[0036] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. An experimental starting device for an adaptive variable cycle compression system, characterized in that, The device includes a throttle valve, a cooler, a vacuum pump and a motor. Among them, the throttle valve is arranged at the rear side of the exhaust volute forming the third duct and is connected to the cooler and the vacuum pump through pipelines. The vacuum pump is connected to the motor, and the motor drives the vacuum pump to operate. After the vacuum pump operates, a negative pressure is formed at the rear end of the exhaust volute, so that the third duct can exhaust independently.

2. The experimental starting device for an adaptive variable cycle compression system according to claim 1, characterized in that, The vacuum pump is a water-ring vacuum pump.

3. An experimental starting method for an adaptive variable cycle compression system, using the experimental starting device for an adaptive variable cycle compression system according to any one of claims 1 or 2, characterized in that, The test starting method includes: According to the design requirements of the adaptive variable cycle compression system, determining the designed exhaust flow value of the third duct under the test starting state of the adaptive variable cycle compression system; Determining the specification model of the test starting device according to the designed exhaust flow value, so that the suction flow formed after the test starting device is connected to the adaptive variable cycle compression system test is not lower than the designed exhaust flow value; Determining the states of the components of the test starting device according to the designed exhaust flow value of the third duct under the test starting state of the adaptive variable cycle compression system and the suction flow after the test starting device is connected to the adaptive variable cycle compression system; Starting the motor in the test starting device to drive the vacuum pump to work, and adjusting the motor speed to adjust the speed of the vacuum pump to the speed required by the third duct in the starting state to provide a suction flow that meets the requirements; Starting the adaptive variable cycle compression system to complete the starting of the adaptive variable cycle compression system.

4. The experimental starting method for an adaptive variable cycle compression system according to claim 3, characterized in that, The states of the components of the test starting device include: the valve opening of the throttle valve, the cooling flow of the cooler, and the speed of the motor or the vacuum pump.

5. The experimental starting method for an adaptive variable cycle compression system according to claim 3, characterized in that, The speed of the motor is adjusted through a frequency converter.

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