开口风洞剪切层流场特性

倪章松; 张军; 王茂

doi:10.13224/j.cnki.jasp.2020.02.003

开口风洞剪切层流场特性

doi: 10.13224/j.cnki.jasp.2020.02.003

基金项目: 国家自然科学基金（11504417）

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出版历程
- 收稿日期: 2019-10-03
- 刊出日期: 2020-02-28

Characteristics of shear-layer flow field of open-jet wind tunnels

1.
School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China
2.
State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China

摘要

摘要: 给出了开口风洞剪切层厚度简化计算公式,开展了数值计算,研究了扩散率和偏移量参数对剪切层速度剖面的影响;分别在两座开口风洞中开展了实验研究,得到了剪切层速度剖面、剪切层厚度、湍流强度和湍流功率谱的变化规律,并将理论结果与实验结果进行了对比分析,结果表明:离开喷口一定距离后,剪切层的轴向速度剖面强自相似,而横向速度剖面弱自相似;剪切层的厚度沿流向位置线性增长;湍流强度值在射流核心区较小且基本稳定,在剪切层区域快速增加;剪切层湍流功率谱为宽带谱,没有与周期性旋涡脱落相关的谱峰。
- 开口风洞 /
- 剪切层流场 /
- 速度剖面 /
- 剪切层厚度 /
- 湍流强度
Abstract: Simplified theoretical formulae for the calculation of the axial and the transversal speeds of open-jet flow were presented. And the effects of two control parameters, ie, the offset parameter and the spreading rate, on the speed profile were analyzed. Experimental studies were performed in two wind tunnels respectively. The distributions of shear-layer speed profile, shear-layer thickness, turbulence intensity and turbulence spectrum were obtained. And the obtained data were compared with theoretical predictions. Results indicated that: beyond a distance from the nozzle, the axial speed profile was strongly self-similar, while the transversal speed profile was weakly self-similar; the shear-layer thickness linearly increased with stream-wise distance; the turbulence intensity was small and stable in the core flow region, slowly but linearly increased in the fully developed region, and rapidly increased in the shear-layer region; the shear-layer turbulence spectrum was broadband, no peaks can be identified in the spectrum.
- open-jet wind tunnel /
- shear-layer flow field /
- velocity profile /
- shear-layer thickness /
- turbulence intensity

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参考文献(18)

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