Experimental support for the attached-eddy hypothesis in zero-pressure-gradient turbulent boundary layers
Experimental support for the attached-eddy hypothesis in zero-pressure-gradient turbulent boundary layers
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DOI：
10.1017/s0022112090001057
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发表时间：
1990-09
影响因子：
3.7
通讯作者：
A. Perry;J. D. Li
中科院分区：
文献类型：
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作者：
A. Perry;J. D. Li
在不同雷诺数下，对光滑壁面以及"k型"和"d型"粗糙壁面进行了湍流边界层实验。谱结果和宽带湍流强度结果都有力地支持了汤森（1976）附加的涡动假设和佩里& Chong（1982）模型。使用"飞行"热线技术获得的频谱结果表明，使用泰勒（1938）假设将频谱从频域转换到波数域时存在误差。在考虑粘性耗散谱区的情况下，宽带湍流强度的计算结果与附加的涡动假设吻合得很好。佩里、林和亨贝斯特（1987）对光滑壁和粗糙壁给出的各种常数的不一致性已作了解释和消除。热线的空间分辨率的缺乏在一定程度上解释了垂直于壁的分量的湍流强度的分散。这种空间分辨率效应在高雷诺数时的近壁区最为明显，并已用Wyngaard（1968）的方法进行了修正。
Turbulent boundary layer experiments have been conducted at various Reynolds numbers on smooth walls and also on ‘k-type’ and ‘d-type’ rough walls. Both the spectral results and the broadband turbulence intensity results strongly support the Townsend (1976) attached eddy hypothesis and the Perry & Chong (1982) model. The spectral results obtained using the ‘flying’ hot-wire technique show the errors involved when using Taylor's (1938) hypothesis for converting the spectra from the frequency domain to the wavenumber domain. If the viscous dissipation spectral region is taken into account, the broadband turbulence intensity results agree well with the attached eddy hypothesis. The inconsistency of the various constants given in Perry, Lim & Henbest (1987) for the smooth and rough walls has been explained and removed. Lack of spatial resolution of the hot wires explains to some extent the scatter in the turbulence intensity of the component normal to the wall. This spatial resolution effect is most pronounced in the near-wall region at high Reynolds number and has been corrected by using the method of Wyngaard (1968).