A note on the overlap region in turbulent boundary layers
A note on the overlap region in turbulent boundary layers
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DOI：
10.1063/1.870250
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发表时间：
2000
影响因子：
4.6
通讯作者：
J. M. Österlund;A. Johansson;H. Nagib;M. Hites
中科院分区：
文献类型：
--
作者：
J. M. Österlund;A. Johansson;H. Nagib;M. Hites
最近完成了两个独立的实验研究的湍流边界层的行为与增加雷诺数。实验是在两个设施中进行的，皇家理工学院（KTH）的最小湍流级（MTL）风洞和伊利诺伊理工学院（IIT）的国家诊断设施（NDF）风洞。这两个实验都利用油膜干涉法来获得壁面剪应力的独立测量。这两个实验的负责人刚刚完成了一项合作研究，目的是了解边界层内外部分重叠区域的特征。这里总结的结果，利用平均速度的轮廓，雷诺数的基础上的动量厚度范围从2500到27 000。与一些早期出版物的结论相反，对数据的仔细分析表明，参数描述没有显着的雷诺数依赖性。
Two independent experimental investigations of the behavior of turbulent boundary layers with increasing Reynolds number were recently completed. The experiments were performed in two facilities, the Minimum Turbulence Level (MTL) wind tunnel at Royal Institute of Technology (KTH) and the National Diagnostic Facility (NDF) wind tunnel at Illinois Institute of Technology (IIT). Both experiments utilized oil-film interferometry to obtain an independent measure of the wall-shear stress. A collaborative study by the principals of the two experiments, aimed at understanding the characteristics of the overlap region between the inner and outer parts of the boundary layer, has just been completed. The results are summarized here, utilizing the profiles of the mean velocity, for Reynolds numbers based on the momentum thickness ranging from 2500 to 27 000. Contrary to the conclusions of some earlier publications, careful analysis of the data reveals no significant Reynolds number dependence for the parameters desc...