湍流边界层标度律和间歇性的实验研究(张珂; 李万平)

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x"G:^-MVd3O7E6^0【作者】张珂; 李万平 【作者单位】华中科技大学土木工程与力学学院水利论文 avd\ A Z

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【论文摘要】 利用高分辨率、高帧率 PIV 系统对湍流边界层中的标度律和间歇性进行了实验研究。实验是在动量损失厚度雷诺数(Reθ=2167)下测量平板湍流边界层中缓冲层、对数区和外区的二维瞬时速度场。应用小波分析以及传统统计学方法,对距离壁面不同位置的流向脉动速度的概率密度函数、低阶结构函数的标度律(-1<P<2)以及间歇性进行研究.实验结果说明距离壁面越近,湍流的间歇性越强。水利论文S7Zlea,a(B5p

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【英文论文摘要】 In this paper PIV system is used to measure scaling law and intermittency in the turbulent boundary layer of a flat plate.The streamwise and spanwise scales at Reθ=2167 are obtained by wavelet analysis and traditional statistic methods at different vertical locations.We will attempt to provide a brief overview on our recent work,including the probability density function(PDF) of wavelet coefficients,scaling law (-1<P≤2)of low-order structure function and intermittency in the turbulent boundary layer.

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【论文关键词】 湍流边界层; PIV; 概率密度函数; 标度律; 间歇性水利论文r9c+K.Z1[A"SR
【英文论文关键词】 turbulent boundary layer; PIV; probability density function; scaling law; intermittency
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TAG: 间歇性 张珂 李万平 湍流边界层 标度
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