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Hot line measurement wind tunnel flow field disturbance modal method

A flow field and hot wire technology, which is applied in the field of hot wire measurement of flow field disturbance modes in wind tunnels, can solve the problems of inability to measure the dominant pulsation amount and modal change characteristics of the flow field, so as to solve the problem of flow field disturbance modal measurement and measurement. Clear method, simple installation effect

Active Publication Date: 2021-09-21
中国空气动力研究与发展中心设备设计与测试技术研究所
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Problems solved by technology

[0003] Existing technologies mainly use pulsating pressure sensors or microphones to measure wind tunnel static pressure fluctuations, use total temperature probes to measure wind tunnel temperature fluctuations, and use techniques such as particle image velocimetry to measure subsonic flow field vortices. However, there is no unified method to simultaneously measure the above Four kinds of wind tunnel flow field disturbance modes, unable to measure the dominant fluctuating quantity and mode change characteristics of the flow field

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  • Hot line measurement wind tunnel flow field disturbance modal method
  • Hot line measurement wind tunnel flow field disturbance modal method
  • Hot line measurement wind tunnel flow field disturbance modal method

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Embodiment Construction

[0037] Figure 5 It is a flow field entropy modal measurement map, Image 6 It is an actual measure of flow field eddy modes. Figure 7 It is an actual measurement map of flow field acoustic modalities. Figure 8 It is an actual measurement map of flow field mixing modalities.

[0038] Case 1: In a low temperature wind, the flow rate is 0.5, the total temperature is 110K, and the measurement is 0.7, 0.8, 0.9, 1.0, 1.2, 1.4, 1.6, 1.8 overheating than the 8 groups of overcaps compared to data, According to the formula 1, the pulsation feature graph fitted to the horizontal coordinate value is R, the ordinate value is θ. Measurement Figure 5 The flow field entropy mode, which is a straight line, and the straight line is in the vicinity of the -α point, and the flow field disturbance is dominated by temperature pulsation. In order to improve the quality of the flow field, the focus is optimized for the uniformity of the flow field.

[0039] Case 2: In a cross-sound speed wind tunnel test...

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Abstract

The invention discloses a hot line measurement wind tunnel flow field disturbance modal method, and belongs to the technical field of flow field testing. According to a fitting relation curve characteristic between a dimensionless pulsation value theta of a hot wire working voltage and a dimensionless value r of a hot wire sensitivity coefficient, four modes of flow field disturbance, namely an eddy mode, an entropy mode, an acoustic mode and a mixed mode, are judged. According to the hot line measurement wind tunnel flow field disturbance modal method, the probe is simple and easy to install, the measurement method is clear, the disturbance mode of the flow field can be accurately measured, and a basis is provided for flow field disturbance mode evaluation and flow field quality optimization.

Description

Technical field [0001] The present invention belongs to the field test technology, and in particular, the present invention relates to a hotline measuring wind center disturbance modal method. Background technique [0002] The wind tunnel flows under different flow rate, temperature and inner structure conditions, there are four disturbance modalities: when the disturbance is dominated by temperature pulsation, it is called an entropy mode; when the disturbance is dominated by speed pulsation, it is called For a vortex; when the disturbance is dominated by static pulsation, it is called a sound modal; when there is no obvious highlight pulsation, it is called a mixed mode. Measuring the wind farm perturbation mode, you can master the dominant factors and flow mechanism of wind turmoil disturbances, and then evaluate and targeted the quality of wind farm. [0003] The prior art mainly uses a pulsating pressure sensor or a microphone to measure the wind tunneling, using a total tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/067
Inventor 朱博王宁陈钦
Owner 中国空气动力研究与发展中心设备设计与测试技术研究所
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