| 张珂*,李万平.壁面湍流标度律的PIV实验研究[J].实验力学,2008,23(6):549~556 |
| 壁面湍流标度律的PIV实验研究 |
| PIV Experimental Research of the Scaling Law in Wall Turbulence |
| 投稿时间：2008-04-10 修订日期：2008-10-10 |
| DOI： |
| 中文关键词: 湍流边界层 概率密度函数 PIV(Particle-Image Velocimetry 粒子图像测速仪) 标度律 |
| 英文关键词:turbulent boundary layer probability density function PIV(Particle-Image Velocimetry) scaling law |
| 基金项目:国家自然科学基金资助项目(10372033) |
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| 中文摘要: |
| 利用高分辨率、高帧率PIV系统对湍流边界层内的自相似标度律在不同的壁面距离的具体表达形式进行了实验研究。在动量损失雷诺数(Reθ=2167)下测量平板湍流边界层内的二维瞬时速度场。应用小波分析和传统统计学方法，在垂直于平板的平面内，对不同法向位置的自相似的标度律的具体形式及其随尺度的变化情况进行考察，并与已知的She-leveque(简称SL)标度律进行比较分析。结果表明，越接近壁面，结构函数的概率密度曲线尾部越宽，表现出逐渐增强的间歇性；并且随着壁面距离的减小，ESS标度律曲线与SL标度律曲线之间的差别 |
| 英文摘要: |
| Expression form of the self-similarity scaling law in turbulent boundary layer at different distances was experimentally studied by using high-resolution, high-frame rate Particle-Image Velocimetry (PIV) system. Two-dimensional instantaneous velocity field was measured in a flat turbulent boundary layer with momentum thickness Reynolds number Reθ=2167. While in the plane perpendicular to the flat and at different wall distances, the forms and its variation with scale of Extended Self Similarity (ESS) were studied and compared with She-leveque (SL) scaling law based on wavelet and traditional statistic methods. Results show that closer to the wall, the curve tail of probability density function becomes wider, which indicates more and more obvious intermittency. Along with the wall distance decrease, distinction between the scaling exponents of ESS and SL increases; while the difference between scaling exponents of new form and SL scaling law decreases. The change of structure function scaling exponents is small when same structure scale is extracted by wavelet at different wall distance. But as extracted structure scale increase, the application range of the two forms scaling law increases. |
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