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倪章松,张军,王茂.开口风洞剪切层流场特性[J].航空动力学报,2020,(2):244~251
开口风洞剪切层流场特性
Characteristics of shear-layer flow field of open-jet wind tunnels
投稿时间:2019-10-03  
DOI:10.13224/j.cnki.jasp.2020.02.003
中文关键词:  开口风洞  剪切层流场  速度剖面  剪切层厚度  湍流强度
英文关键词:open-jet wind tunnel  shear-layer flow field  velocity profile  shear-layer thickness  turbulence intensity
基金项目:国家自然科学基金(11504417)
作者单位
倪章松 School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China 
张军 State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China 
王茂 State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China 
摘要点击次数: 39
全文下载次数: 75
中文摘要:
      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。
英文摘要:
      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.
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