A high-precision air inlet flow measurement method

A flow measurement and flow measurement device technology, which is applied in the field of high-precision inlet flow measurement, can solve problems such as large errors and complex measurement devices, and achieve good uniformity, high measurement accuracy, and simple and reliable measurement methods.

Active Publication Date: 2021-12-07
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, provide a high-precision air inlet flow measurement method, which can accurately obtain the air inlet outlet flow, and overcome the problems of complex measuring devices and large errors in the existing methods. By measuring the static pressure of different sections to obtain the outlet flow of the inlet port

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  • A high-precision air inlet flow measurement method
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  • A high-precision air inlet flow measurement method

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0039] Such as figure 1 Shown is the principle diagram of the high-precision air inlet flow measurement method of the present invention. The present invention uses a flow measurement device to measure the air inlet flow. The flow measurement device includes a rectification device and a measurement section. The outlet of the air inlet is connected, and the measuring section is connected with the rectifying device, for example, the measuring section and the rectifying device can be connected through a flange.

[0040] The measurement section includes the first equal straight section, the contraction section, the second equal straight section and the expansion section. The two measurement sections are respectively selected on the first equal straight section and the second equal straight section. The areas of the two selected measurement sections a...

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Abstract

The invention relates to a high-precision air inlet flow measurement method, which uses a flow measurement device to measure the air inlet flow, obtains wall static pressures of sections with different radii through pressure measurement, and solves the problem according to the isentropic flow relation and mass conservation relation The total pressure of the local flow is obtained, and the outlet flow of the inlet is obtained by further calculation. By reasonably selecting two measurement sections and performing accurate calculations, the mass flow rate of the inner flow of the inlet can be obtained simply and accurately; the present invention directly solves the obtained by measuring the wall static pressure The outlet flow rate of the inlet port does not need to carry out the design and processing of the total pressure rake, which reduces the cost of the device, and the measurement method is simple and reliable, and has strong realizability; because the present invention does not measure the total pressure, there is no difference between the total pressure rake and the inner flow channel. Influence, the uniformity of the measurement section is good, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to a high-precision air inlet flow measurement method, which is used in wind tunnel tests to accurately measure the air inlet outlet flow, and belongs to the technical field of fluid power. Background technique [0002] The air intake is a key part of the air-breathing aircraft. It is a well-designed airflow channel. Its function is to decelerate and pressurize the incoming airflow and provide it to the engine combustion chamber. The performance of the airflow directly affects the engine and even The overall performance of the aircraft. Inlet wind tunnel test is the main means to evaluate the performance of the inlet and obtain the characteristic parameters of the inlet. The flow coefficient is the ratio of the actual flow entering the inlet to the free flow captured by the inlet, and is the main characteristic of the inlet. one of the parameters. [0003] In order to measure the actual mass flow rate entering the inlet, the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 周健刘磊李红坤钱丹丹唐亚丽
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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