Rotary harrow total pressure test system and test method suitable for aircraft air inlet channel

A technology of air inlet and rotary rake, which is applied in the field of total pressure test device at the outlet of the air inlet for wind tunnel tests, which can solve the problem of large area occupied by the support and fixed structure, the inability to obtain the true distribution of the total pressure of the outlet, and the aggravation of the degree of throttling at the outlet and other problems, to achieve the effect of simple structure, increase the total pressure test range, and reduce the outlet clogging degree

Active Publication Date: 2021-04-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

This method has been widely used in wind tunnel tests and flight tests, but due to the limited number of total pressure probes installed, the "meter" word rake or "water" word rake cannot obtain the true distribution of the total outlet pressure. The error is large, especially for the measurement of outlet distortion
In addition, the traditional "rice" or "water" rake has a larger total frontal area, which obviously intensifies the degree of throttling at the outlet and has a greater impact on the flow field in the inlet. This situation is even more severe when the model size is small. as significant
In addition to the above unfavorable factors, due to the limitations of the structure of the traditional total pressure rake, the positions of the total pressure rake and the total pressure probe are fixed, so the circumferential angle of the total pressure data is fixed. Compared with the high cost of wind tunnel operation, a single experiment The data obtained are too limited and the economy is poor
Especially for the outlet distortion index that is concerned with the design of the inlet, a large number of experiments are required to obtain effective data, which is a huge loss in terms of personnel, material resources and time.
[0004] For example, the Chinese invention patent application with publication number 107917793A discloses a multi-row pressure measuring rake used in fluid mechanics experiments, but this multi-row pressure measuring rake structure only increases the number of spanwise probes, but also aggravates the flow path The clogging can easily have an adverse effect on the flow
In addition, the area occupied by the supporting and fixed structure itself is too large, exceeding the area of ​​the flow channel occupied by the Pozi rake, which will have a greater adverse effect on the flow channel

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  • Rotary harrow total pressure test system and test method suitable for aircraft air inlet channel
  • Rotary harrow total pressure test system and test method suitable for aircraft air inlet channel
  • Rotary harrow total pressure test system and test method suitable for aircraft air inlet channel

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Embodiment Construction

[0021] see figure 1 and figure 2 , the invention discloses a rotary rake total pressure testing system suitable for an aircraft air intake. Including total pressure rake module, rotating module, stepper motor. The total pressure rake module includes a total pressure probe 5 and a probe integrated board 10 for testing the total pressure signal. The total pressure probe is uniformly assembled on the probe integrated board 10 with the center of the inlet outlet circle as the center point, as The total pressure acquisition part on the total pressure rake.

[0022] According to different wind tunnel sizes and test scale model sizes to the sensitivity of the intake port outlet blockage, the present invention provides two transmission implementation modes, such as figure 1 As shown, the first embodiment includes a rectification and positioning module; figure 2 As shown, the second embodiment includes the torque transmission and steering module, and the second embodiment does no...

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Abstract

The invention discloses a rotary harrow total pressure test system and test method suitable for an aircraft air inlet channel. The test system comprises a total pressure harrow module, a rotating module and a driving device. The total pressure harrow module is driven by a driving device to rotate so that the pressure probe on the total pressure harrow can test the total pressure at different positions in the outlet of the air inlet channel in a pneumatic operation process. The system is simple in structure, small in size, wide in test range, high in quantization precision and rich in obtained data, avoids additional blockage of a test flow channel by traditional total pressure test systems such as a *-shaped harrow, a water-shaped harrow and the like and even adverse effects that the air inlet channel is not started, and solves the problems that the traditional total pressure harrow is fixed in structure position, single in data and the like. The test precision is greatly improved, the test cost is reduced, the influence on a test flow field is small, and the system is particularly suitable for a total pressure test with a small scaling model and a small flow channel area.

Description

technical field [0001] The invention belongs to the field of air inlet wind tunnel tests, and in particular relates to a total pressure test device for air inlet outlets used in wind tunnel tests. Background technique [0002] The intake port is responsible for providing sufficient capture flow to the downstream engine, and its performance has a decisive impact on the thrust and stability of the engine. The main evaluation indicators of the inlet performance are the recovery coefficient of the total pressure at the outlet of the inlet and the distortion index of the outlet flow field, that is, the quality of the outlet flow field. an important part of. Due to the limitation of the size of the wind tunnel and the experimental funds, the inlet test often adopts a scaled model, so a small change in the flow area of ​​the inlet test model will have a significant impact on the test state and test accuracy, and may cause further damage in severe cases. The airway does not start,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06G01L11/00
CPCG01M9/06G01L11/00
Inventor 孙姝郭赟杰林正康谭慧俊秦源李鑫唐学斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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