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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Orthogonal wavelet decomposition of turbulent structures behind a vehicle external mirror
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Orthogonal wavelet decomposition of turbulent structures behind a vehicle external mirror

机译：车外后视镜后湍流结构的正交小波分解

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摘要

The turbulent structures of various scales around an externally mounted vehicle mirror have been experimentally investigated. The high-speed PIV technique was first used to measure the instantaneous velocity fields of the mirror wake at a Reynolds number of 7900 in the (x, y)-, (x, z)- and (y, z)-plane. The distribution of instantaneous streamlines and vorticity, time-averaged streamlines and Reynolds stresses were examined. Then the instantaneous turbulent structures were decomposed into the large-, intermediate- and relatively small-scale structures by the wavelet multi-resolution technique. It is found that the large-scale vortical structure shed from the root and side portion of mirror forms the separation region, the intermediate- and relatively small-scale structures are respectively generated from the tip of the mirror and the edge of the mirror. The relatively small-scale structures exhibit the strongest vorticity concentration. It is also indicated that the large-scale turbulent structure makes the largest contribution to the Reynolds stress in the range of separation shear layer behind the separation region. The relatively small-scale structure, however, makes a more contribution to the Reynolds stress in the shear layer near the mirror.
机译：已经通过实验研究了围绕外部安装的车辆后视镜的各种尺度的湍流结构。高速PIV技术首先用于在（x，y）-，（x，z）-和（y，z）平面上以7900的雷诺数测量反射镜唤醒的瞬时速度场。检查了瞬时流线和涡度，时间平均流线和雷诺应力的分布。然后利用小波多分辨率技术将瞬时湍流结构分解为大，中，小尺度结构。发现从镜子的根部和侧面部分掉落的大规模旋涡结构形成分离区域，从镜子的尖端和镜子的边缘分别产生中等规模和相对较小规模的结构。相对较小的结构显示出最强的涡度浓度。还表明，在分离区域后面的分离剪切层范围内，大型湍流结构对雷诺应力的贡献最大。但是，相对较小的结构对反射镜附近的剪切层中的雷诺应力做出了更大的贡献。

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