A Key Point Control Method for the Whole Aircraft Ingestion Test of Aero Turbofan Engines

Abstract

This application belongs to the field of overall aircraft bird ingestion test scheme design, and is a key point control method for the overall aircraft bird ingestion test of an aero turbofan engine. By respectively identifying and controlling multiple key points such as components related to bird ingestion assessment, bird launching device, test bird body, camera and supporting lighting, with the key nodes as the center, other non-key nodes can be quickly arranged and accurately controlled. Through this control method of key nodes - non-key nodes, it is possible to eliminate the interference of uncertain factors, avoid repeated tests, and verify the bird ingestion ability of the engine specified by airworthiness and military standards with a high success rate, a low working cycle, and a low development cost. This scheme has been verified in engineering practice and has strong engineering application value.

Description

Technical Field

[0001] The application belongs to the field of overall aircraft bird ingestion test scheme design, and particularly relates to a key point control method for the overall aircraft bird ingestion test of an aero-engine fan. Background Art

[0002] With the rapid development of air transportation, the impact of birds on flight safety has become increasingly prominent. Verifying the bird ingestion ability of engines has become an essential task in the development of aero-engines. The bird ingestion test is somewhat destructive. If any link in the test is not fully prepared, uncertain factors may occur, affecting the accuracy of the test results, and even causing the test to be unable to be completed smoothly, wasting resources, and prolonging the development cycle. In the current bird ingestion tests, there have been cases where the bird ingestion test was not completed smoothly due to reasons such as the actual launch position of the bird body deviating or the bird body being launched in advance when the engine did not reach the test state. Based on the above situation, it is urgent to study and propose a key point control method in the overall bird ingestion test to ensure the accurate and reliable verification of the engine's bird ingestion ability that meets the standard requirements. Summary of the Invention

[0003] The purpose of this application is to provide a key point control method for the overall aircraft bird ingestion test of an aero-engine fan to solve the problems of many uncertain factors and high test risks in the existing overall bird ingestion test.

[0004] The technical solution of this application is as follows: A key point control method for the whole aircraft bird ingestion test of an aero turbofan engine, including: obtaining the standard parameters of the parts related to the bird ingestion assessment, setting the determination set of the bird ingestion parts, and judging whether the parts related to the bird ingestion assessment meet the parameter requirements of the corresponding criteria in the determination set. If so, proceed to the next step; if not, reselect the parts related to the bird ingestion assessment that meet the requirements according to the determination set of the bird ingestion parts; obtaining the standard parameters of the bird ingestion test equipment, setting the test equipment data set, first judging whether the center of the gun barrel installation position in the bird launching device is aligned with the positions of each target point. If so, then judge again whether the position arrangement of the bird launching device and the launching airflow have an additional impact on the engine. If not, then judge again whether the bird body launching parameters are correct. If so, proceed to the next step; if any one of them does not meet the requirements, adjust the test equipment parameters according to the test requirements through the test equipment data set, and repeat the verification until the requirements are met; obtaining the standard parameters for preparing the test bird body, setting the launching parameter data set, and determining whether the weight requirement, the muzzle attitude of the test bird body, and the interval between the asphyxiation / anesthesia treatment of the test bird body and the launch meet the launch requirements. If so, proceed to the next step; if not, adjust the test parameters of the test bird body according to the launching parameter data set, and repeat the verification until the launch requirements are met. Obtain the test equipment data set, and respectively verify the settings of the high-speed camera, ordinary camera, and supporting lights according to the specific arrangements at the engine inlet and engine outlet, and judge whether the shooting meets the requirements. If not, adjust the equipment parameters of the high-speed camera, ordinary camera, or supporting lights, and repeat the determination until the shooting requirements are met; if so, complete the key point control.

[0005] Preferably, the determination method for whether the center of the gun barrel installation position in the bird launching device is aligned with the positions of each target point is as follows: Determine the installation position coordinates of each gun barrel, install the gun barrel, and use the method of laser aiming at the center of the gun barrel to finely adjust the position of the gun barrel until the gun barrel is aligned with the projection target position.

[0006] The installation position coordinates of each gun barrel include:

[0007] The target position coordinates with the engine axis on the impact plane as the origin;

[0008] The height difference between the horizontal plane where the engine axis is located and the installation section of the engine on the test stand;

[0009] The height of the engine installation section on the test stand from the ground;

[0010] The height of each layer of gun rack used for gun barrel installation from the ground;

[0011] The installation connection structure size between the gun barrel and the gun rack;

[0012] The gun barrel diameter.

[0013] Preferably, the method for determining whether the bird launching device has an additional impact on the engine by the position arrangement of the bird launching device and the emitted airflow is as follows: According to the structural dimensions of the gun mount in the engine inlet area and the preliminary determination result of the distance between the gun mount and the engine inlet, calculate the blockage ratio of the engine inlet, and judge whether the installation distance is reasonable. If so, proceed to the next step; on the premise that the installation distance is reasonable, conduct a bird launching test of the bird launching device, obtain test data, conduct a dynamic impact assessment of the bird launching device, and judge whether the requirements are met. If so, proceed to the next step; according to the test data of the launching test, conduct multiple rounds of debugging on the bird launching device, and judge whether the bird body launching parameters are accurate. If so, it is determined that there is no additional impact.

[0014] Preferably, the method for dynamic impact assessment includes: whole machine test assessment. Use a gun barrel without stuffing the bird body to launch at a running engine to verify the additional impact of the gas emitted by the gun barrel on the engine. When launching, the engine running step should be the same as the engine running state corresponding to the moment of swallowing the bird in the formal test. If the difference between the parameters of the whole machine test and the standard parameters is within the set threshold range, it is determined that the dynamic impact of the bird launching device meets the requirements; use the same set of bird launching devices as in the whole machine test assessment to conduct a launching test again, and judge whether the differences between the muzzle and the engine inlet distance, the gun barrel launching pressure, and the number of gun barrels and the standard parameters are within the set threshold range. If so, it meets the requirements.

[0015] Preferably, the method for multiple rounds of debugging of the bird launching device is as follows: Install a debugging target board. Under the condition that the installation conditions permit, keep the minimum distance between the target board plane and the fan blade plane; emit a laser through the center of the gun barrel for aiming, and mark the target position on the target board; conduct multiple rounds of launching debugging. When the results of 3 consecutive rounds show that the projection parameters meet the requirements of the bird swallowing test, it is considered that the debugging is completed, and the final projection speed and projection position are obtained.

[0016] Preferably, the settings of the high-speed camera include: The number of high-speed cameras is at least 5, the frame rate is not less than 7000 frames per second, continuously shoot and store the complete bird swallowing process starting from the moment when the bird body exits the barrel, and the recording duration is not less than 20 s; the shooting trigger instruction of the high-speed camera is set to be linked with the bird body launching trigger instruction, and is set to start shooting 0 - 3 s before the bird body is launched; the layout of the high-speed cameras covers each key area of the engine inlet and the engine outlet.

[0017] Preferably, the key areas for the layout of the high-speed cameras include:

[0018] Two high-speed cameras are respectively arranged at two designated positions in the engine inlet area. The two high-speed cameras point towards the engine inlet direction, covering the area range of the engine inlet, and shooting and recording the process of the bird being launched from the muzzle, the process of the bird hitting the fan blades, and the damage of the engine inlet components; One high-speed camera is arranged in the area between the engine intake duct and the muzzle of the gun barrel. The high-speed camera is perpendicular to the engine axis, covering the distance range from the muzzle of the gun barrel to the intake duct, shooting the trajectory of the bird body being launched from the muzzle and the flight trajectory of the bird body, and recording and analyzing the speed of the bird body; Two high-speed cameras are respectively arranged at two designated positions of the engine tail nozzle. The high-speed cameras point towards the tail nozzle direction, and shoot and record the internal and external performance of the engine after swallowing the bird.

[0019] Preferably, at least six ordinary cameras are equipped. They shoot and record the complete process from engine startup to the end of the test, and shoot and record the engine inlet, side and tail areas; The supporting lighting is a strong light device, which is arranged near the muzzle of the gun barrel, irradiates the fan inlet direction, illuminates the fan inlet area, and the supporting lighting adopts multi-point light sources.

[0020] A key point control method for the whole engine bird ingestion test of an aero turbofan engine of the present application can identify and control multiple key points such as the components related to bird ingestion assessment, the bird launching device, the test bird body, the camera and the supporting lighting respectively. By taking the key nodes as the center, other non-key nodes can be quickly arranged and accurately controlled. Through this control method of key nodes - non-key nodes, it is possible to eliminate the interference of uncertain factors, avoid repeated tests, and verify the bird ingestion ability of the engine specified by airworthiness and military standards with a high success rate, a low working cycle, and a low development cost. This solution has been verified in engineering practice and has strong engineering application value. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions provided by the present application, the accompanying drawings will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0022] Figure 1 It is a schematic diagram of the overall process of the present application;

[0023] Figure 2 It is a schematic diagram of the camera arrangement structure in the present application. Detailed Embodiments

[0024] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.

[0025] A key point control method for the whole engine bird ingestion test of an aero turbofan engine

[0026] The engine whole bird ingestion test equipment includes: the test engine, the test stand, the gas gun, the high-speed photography device and the dynamometer. The high-speed photography device includes a high-speed camera. The gas gun is used to project the test bird, project the test bird onto the engine, shoot the projection process through the high-speed photography device, collect the test data through the dynamometer and the test stand, and conduct test analysis.

[0027] As Figure 1 shown, it includes the following steps:

[0028] Step S100, obtain the standard parameters of the components related to the bird ingestion assessment, set the determination set of the bird ingestion components, and judge whether the components related to the bird ingestion assessment meet the parameter requirements of the corresponding criteria in the determination set. If so, execute the next step; if not, re-select the components related to the bird ingestion assessment that meet the requirements according to the determination set of the bird ingestion components;

[0029] The determination set of the bird ingestion components contains more than 8 standard parameters such as the size, shape, and position of each component related to the bird ingestion assessment.

[0030] The components related to the assessment include:

[0031] 1) The test engine

[0032] a) The components directly impacted by the bird body, such as the fan rotor blades, fan stator blades, fan cowl, low-pressure compressor rotor and stator blades, etc.;

[0033] b) The components on the load transfer path of the rotor system after the bird body impacts, such as the fan shaft, low-pressure turbine shaft, front support bearing housing of the low-pressure rotor, intermediate case, rear support bearing housing of the low-pressure rotor, turbine rear case, installation system, etc.;

[0034] c) The components affected by the aerodynamic damage caused after the bird body enters the flow path, such as the low-pressure compressor flow path components, high-pressure compressor flow path components, etc.;

[0035] d) The control system hardware and software that affect the engine control after the bird body impacts, such as the digital electronic controller, fuel pump-regulator, VBV actuator, VSV actuator, etc.;

[0036] e) The components that may cause secondary damage after the bird impacts and directly affect the assessment results, such as the fan containment case, engine fuel supply and return pipelines, etc.

[0037] 2) The supporting parts for the test

[0038] a) To simulate the load on the engine inlet case by the intake device under real flight conditions, an aircraft intake duct or a process intake duct equivalent to the aircraft intake duct in terms of weight and static suspension moment (weight suspension force arm) is required;

[0039] b) To simulate the loads on the accessory case exerted by aircraft accessories installed on the engine under real flight conditions, it is necessary to install aircraft accessories or weights, static suspension moments (weight suspension force arm), and process parts equivalent to aircraft accessories, such as aircraft alternators, aircraft hydraulic pumps, etc.;

[0040] c) To simulate the load transfer between the engine installation system and the wing under real flight conditions, the connection structure between the installation system and the test bench needs to be the same as the connection structure between the installation system and the wing, or it is analyzed and proven that the bearing capacities of the two are the same, such as connecting bolts, nuts, washers, bushings, shear pin bushings, etc.

[0041] When all the components related to the bird ingestion assessment can meet the requirements of the bird ingestion component judgment set, ensure the accurate state of the components related to the bird ingestion assessment and be able to simulate the bearing situation of the engine installed on the aircraft.

[0042] Step S200: Obtain the standard parameters of the bird ingestion test equipment, set the test equipment data set, first judge whether the center of the gun barrel installation position in the bird launching device is aligned with the positions of each target point. If so, then judge again whether the position arrangement of the bird launching device and the launch airflow have an additional impact on the engine. If not, then judge again whether the bird body launch parameters are correct. If so, execute the next step; if any one of them does not meet the requirements, adjust the test equipment parameters according to the test requirements through the test equipment data set and repeat the verification until the requirements are met;

[0043] Step S210: The method for judging whether the center of the gun barrel installation position in the bird launching device is aligned with the positions of each target point is as follows:

[0044] 1) Determine the installation position coordinates of each gun barrel, and install the gun barrels. The installation position coordinates of each gun barrel include:

[0045] The target position coordinates with the engine axis on the impact plane as the origin;

[0046] The height difference between the horizontal plane where the engine axis is located and the installation section of the engine on the test stand;

[0047] The height of the engine installation section on the test stand from the ground;

[0048] The height of each layer of gun rack used for gun barrel installation from the ground;

[0049] The installation connection structure dimensions between the gun barrel and the gun rack;

[0050] The gun barrel diameter.

[0051] 2) Adopt the method of laser aiming at the center of the gun barrel to finely adjust the position of the gun barrel until the gun barrel is aligned with the projection target position.

[0052] Step S220. The method for determining whether the position arrangement of the bird-throwing device and the launching air flow have an additional impact on the engine is as follows:

[0053] Step S221. According to the initial determination results of the gun mount structure dimensions in the engine inlet area and the distance between the gun mount and the engine inlet, calculate the blockage ratio of the engine inlet, and judge whether the installation distance is reasonable. If so, and if the blockage ratio result indicates that the bird-throwing device has no impact on the engine, then preliminarily verify that the installation distance is reasonable and proceed to the next step; otherwise, the distance between the gun mount and the engine inlet needs to be increased to reduce the blockage ratio and eliminate the impact.

[0054] Step S222. On the premise of ensuring a reasonable installation distance, conduct a launching test of the bird-throwing device, obtain test data, conduct a dynamic impact assessment of the bird-throwing device, and judge whether the requirements are met. If so, proceed to the next step.

[0055] Preferably, the method for dynamic impact assessment includes:

[0056] 1) The whole-machine test method. Use a gun barrel without stuffing the bird body to launch at a running engine to verify the additional impact of the gas launched by the gun barrel on the engine. When the gun barrel launches, the engine running stage should be the same as the engine running state corresponding to the moment of swallowing the bird in the formal test. If the difference between the parameters of the whole-machine test and the standard parameters is within the set threshold range, it is determined that the dynamic impact of the bird-throwing device meets the requirements.

[0057] At the same time, the launching pressure of the gun barrel should be the result of pressure debugging at the target bird weight and bird speed.

[0058] The parameters for impact assessment should include: the whole-machine performance parameters, such as engine thrust, exhaust temperature, rotation speed, and control parameters; vibration parameters; pulsation parameters, etc.

[0059] 2) The analogy analysis method. Use the same set of bird-throwing devices as those evaluated in the whole-machine test to conduct a launching test again, and judge whether the differences between the distance between the muzzle and the engine inlet, the launching pressure of the gun barrel, and the number of gun barrels in this test and the standard parameters are within the set threshold range. If so, it meets the requirements.

[0060] Step S223. According to the test data of the launching test, conduct multiple rounds of debugging on the bird-throwing device, and judge whether the bird body launching parameters are accurate. If so, it is determined that there is no additional impact.

[0061] Preferably, the method for multiple rounds of debugging of the bird-throwing device is as follows:

[0062] Install a debugging target board. Under the condition that the installation conditions permit, keep the minimum distance between the plane of the target board and the plane of the fan blades.

[0063] Launch a laser through the center of the gun barrel for aiming, and mark the target position on the target board.

[0064] Conduct multi-round launch debugging. When the results of three consecutive rounds show that the projection parameters meet the requirements of the bird ingestion test, it is considered that the debugging is completed, and the final projection speed and projection position are obtained.

[0065] At the same time, the following should also be noted:

[0066] ① Compared with the birds used in the formal test, the birds used for debugging need to be consistent in terms of bird body type, weight, quantity, treatment and wrapping method, and the time limit for launch after treatment, etc., to avoid deviation of the debugging results caused by bird body differences.

[0067] ② After the installation and debugging work is completed, it is prohibited to move the position of the gun barrel.

[0068] Through step S200, it can be ensured that the center of the installation position of the gun barrel in the bird projection device is aligned with the positions of each target point, and the layout of the bird projection device and the launch airflow will not have an additional impact on the engine, ensuring the correct launch parameters of the bird body, thereby ensuring the accuracy and efficiency of the test.

[0069] Step S300, obtain the standard parameters for preparing the test bird body, set the launch parameter dataset, determine whether the weight requirement, the muzzle attitude of the test bird body, and the interval between the asphyxiation / anesthesia treatment of the test bird body and the launch meet the launch requirements. If so, proceed to the next step; if not, adjust the test parameters of the test bird body according to the launch parameter dataset and repeat the verification until the launch requirements are met.

[0070] Preferably, for the preparation of the test bird body, in addition to the basic parameters of weight and quantity meeting the requirements, it is also necessary to control from the following aspects:

[0071] 1) The bird body should simulate the impact of a real bird body hitting the engine in terms of body posture, tissue composition, bone and muscle distribution, flight attitude, etc. Select fresh natural birds such as chickens, pigeons, sparrows, etc., and the specific type is determined according to the weight requirement.

[0072] 2) To ensure the stable posture of the bird body after it is launched out of the muzzle and avoid deviation of the impact position, it is necessary to properly wrap or tie the bird body, such as tying it with cotton thread for 2 - 3 turns.

[0073] 3) The time interval between the asphyxiation / anesthesia treatment of the test bird body and the launch is not allowed to exceed 30 minutes to prevent deviation of the test injury results caused by the bird body being too hard.

[0074] Step S400, obtain the test equipment dataset, and respectively conduct setting verification of the high-speed camera, ordinary camera and supporting lights according to the specific layouts of the engine inlet and engine outlet, and judge whether the shooting meets the requirements. If not, adjust the equipment parameters of the high-speed camera, ordinary camera or supporting lights and repeat the determination until the shooting requirements are met; if so, complete the key point control.

[0075] Preferably, the settings of the high-speed cameras include:

[0076] 1) There are at least 5 high-speed cameras, with a frame rate of not less than 7000 frames per second. They continuously shoot and store records of the complete bird-swallowing process starting from the moment the bird leaves the barrel, and the recording duration is not less than 20 s;

[0077] 2) The shooting trigger instruction of the high-speed cameras is set to be linked with the bird-launching trigger instruction and starts shooting 0 - 3 s before the bird is launched;

[0078] 3) The layout of the high-speed cameras covers key areas at the engine inlet and the engine outlet.

[0079] As Figure 2 shown, where the black cameras are high-speed cameras and the white cameras are ordinary cameras.

[0080] Preferably, the key areas where the high-speed cameras are arranged include:

[0081] ① At two designated positions in the engine inlet area, 2 high-speed cameras are respectively arranged, such as Figure 2 in positions (1) and (2) in the figure. The 2 high-speed cameras point to the engine inlet direction, covering the area range of the engine inlet, and shooting and recording the process of the bird being launched from the muzzle, the process of the bird hitting the fan blades, and the damage of the engine inlet components;

[0082] ② In the area between the engine air intake duct and the muzzle of the gun barrel, 1 high-speed camera is arranged, such as Figure 2 in position (3) in the figure. The high-speed camera is perpendicular to the engine axis, covering the distance range from the muzzle of the gun barrel to the air intake duct, shooting the trajectory of the bird body being launched from the muzzle, and recording and analyzing the speed of the bird body;

[0083] ③ At two designated positions of the engine tail nozzle, 2 high-speed cameras are respectively arranged, such as Figure 2 in positions (4) and (5) in the figure. The high-speed cameras point to the tail nozzle direction, and shoot and record the internal and external performances of the engine after swallowing the bird.

[0084] Preferably, at least 6 ordinary cameras are equipped to shoot and record the complete process from the start of the engine to the end of the test, and shoot and record the engine inlet, side and tail areas. As Figure 2 shown in positions (6) - (11) in the figure, shoot and record the complete performance of the engine from different angles.

[0085] Preferably, the supporting lighting is a strong light device, arranged near the muzzle of the gun barrel, irradiating the fan inlet direction, illuminating the fan inlet area. The supporting lighting uses multi-point light sources instead of single-point light sources. For example, 12 2.5 - kw xenon arc lamps are used.

[0086] Through the identification and control of multiple key points, such as the components related to the swallow bird assessment, the bird throwing device, the test bird body, the camera and the supporting lighting, respectively, with the key nodes as the center, the other non-key nodes can be quickly arranged and accurately controlled. Through this control method of key nodes - non-key nodes, the interference of uncertain factors can be excluded, and the test can be avoided from being repeated. The verification of the engine's swallow bird ability stipulated by airworthiness and military standards can be achieved with a high success rate, a low working cycle, and a low research and development cost. This solution has been verified in engineering practice and has strong engineering application value.

[0087] The above is only the specific implementation manner 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 those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A key point control method for the whole aircraft ingestion bird test of an aero turbofan engine, characterized in that Including: Obtain the standard parameters of the parts related to the bird ingestion assessment, set the determination set of the bird ingestion parts, and determine whether the parts related to the bird ingestion assessment meet the parameter requirements of the corresponding criteria in the determination set. If so, proceed to the next step; If not, reselect the parts related to the bird ingestion assessment that meet the requirements according to the determination set of the bird ingestion parts; Obtain the standard parameters of the bird ingestion test equipment, set the test equipment data set. First, determine whether the center of the gun barrel installation position in the bird launching device is aligned with the positions of each target point. If so, then determine again whether the layout of the bird launching device and the launch air flow have an additional impact on the engine. If not, then determine again whether the bird body launch parameters are correct. If so, proceed to the next step; If any one of them does not meet the requirements, adjust the test equipment parameters according to the test requirements through the test equipment data set and repeat the verification until the requirements are met; Obtain the standard parameters for the preparation of the test bird body, set the launch parameter data set, and determine whether the weight requirement, muzzle attitude of the test bird body, and the interval from asphyxiation / anesthesia treatment to launch of the test bird body meet the launch requirements. If so, proceed to the next step; If not, adjust the test parameters of the test bird body according to the launch parameter data set and repeat the verification until the launch requirements are met. Obtain the test equipment data set, and respectively perform the setting verification of the high-speed camera, ordinary camera, and supporting lights according to the specific layouts of the engine inlet and engine outlet, and determine whether the shooting meets the requirements. If not, adjust the equipment parameters of the high-speed camera, ordinary camera, or supporting lights and repeat the determination until the shooting requirements are met; If so, complete the key point control; The setting of the high-speed camera includes: The number of high-speed cameras is at least 5, the frame rate is not less than 7000 frames per second, continuously shoot and store the complete bird ingestion process starting from the moment the bird body exits the muzzle, and the recording duration is not less than 20s; The shooting trigger instruction of the high-speed camera is set to be linked with the bird body launch trigger instruction, and is set to start shooting 0 - 3s before the bird body is launched; The layout of the high-speed cameras covers each key area of the engine inlet and engine outlet; The key areas where the high-speed cameras are arranged include: Arrange 2 high-speed cameras at 2 specified positions in the engine inlet area respectively. The 2 high-speed cameras point in the direction of the engine inlet, covering the area range of the engine inlet, and shoot and record the process of the bird being launched from the muzzle, the process of the bird hitting the fan blades, and the damage of the engine inlet parts; Arrange 1 high-speed camera in the area between the engine intake duct and the muzzle of the gun barrel. The high-speed camera is perpendicular to the engine axis, covering the distance range from the muzzle of the gun barrel to the intake duct, shooting the bird body being launched from the muzzle and the flight trajectory of the bird body, and recording and analyzing the speed of the bird body; Arrange 2 high-speed cameras at 2 specified positions of the engine tail nozzle respectively. The high-speed cameras point in the direction of the tail nozzle, and shoot and record the internal and external manifestations of the engine after bird ingestion; The ordinary camera is equipped with at least 6 ordinary cameras, which shoot and record the complete process from engine startup to the end of the test, and shoot and record the engine inlet, side, and tail areas; The supporting lighting is a high-intensity light device, which is arranged at the muzzle position of the gun barrel and irradiates in the direction of the fan inlet to illuminate the fan inlet area. The supporting lighting uses multiple point light sources.

2. The key point control method for the whole aircraft ingestion bird test of an aero turbofan engine according to claim 1, characterized in that, The method for determining whether the center of the installation position of the gun barrel in the bird-throwing device is aligned with each target point position is as follows: Determine the coordinate of the installation position of each gun barrel, install the gun barrel, and use the method of laser aiming at the center of the gun barrel to finely adjust the position of the gun barrel until the gun barrel is aligned with the projection target position. The coordinates of the installation positions of each gun barrel include: The target position coordinates with the engine axis on the impact plane as the origin; The height difference between the horizontal plane where the engine axis is located and the installation section of the engine on the test bench; The height of the engine installation section on the test bench from the ground; The height of each layer of gun mount for gun barrel installation from the ground; The installation connection structure size between the gun barrel and the gun mount; The gun barrel diameter.

3. The key point control method for the whole aircraft bird ingestion test of an aero turbofan engine according to claim 1, characterized in that, The method for determining whether the layout of the bird-throwing device and the launch airflow have an additional impact on the engine is as follows: According to the initial determination results of the gun mount structure size in the engine inlet area and the distance between the gun mount and the engine inlet, calculate the engine inlet blockage ratio to judge whether the installation distance is reasonable. If so, proceed to the next step; On the premise of ensuring a reasonable installation distance, conduct a bird-throwing device launch test, obtain test data, conduct a dynamic impact assessment on the bird-throwing device, and judge whether the requirements are met. If so, proceed to the next step; According to the test data of the launch test, conduct multiple rounds of debugging on the bird-throwing device, and judge whether the bird body launch parameters are accurate. If so, it is determined that there is no additional impact.

4. The key point control method for the whole engine bird ingestion test of an aero turbofan engine according to claim 3, characterized in that, The methods for the dynamic impact assessment include: Overall machine test assessment: Use the gun barrel without stuffing the bird body to launch at the running engine to verify the additional impact of the gas launched by the gun barrel on the engine. When launching, keep the engine running step consistent with the engine running state corresponding to the moment of swallowing the bird in the formal test. If the difference between the parameters of the overall machine test and the standard parameters is within the set threshold range, it is determined that the dynamic impact of the bird-throwing device meets the requirements; Use the same set of bird-throwing device as in the overall machine test assessment to conduct a launch test again, and judge whether the differences between the distance between the muzzle and the engine inlet, the launch pressure of the gun barrel, and the number of gun barrels in this test and the standard parameters are within the set threshold range. If so, it meets the requirements.

5. The key point control method for the whole aircraft bird ingestion test of an aero turbofan engine as described in claim 3, characterized in that, The method for multiple rounds of debugging of the bird-throwing device is as follows: Install a debugging target board. Under the condition that the installation conditions permit, keep the minimum distance between the target board plane and the fan blade plane; Aim at the target position on the target board by emitting laser through the center of the gun barrel; Conduct multiple rounds of launch debugging. When the results of 3 consecutive rounds show that the projection parameters meet the requirements of the bird-swallowing test, it is considered that the debugging is completed, and the final projection speed and projection position are obtained.

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