Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane
Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane
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DOI：
10.1007/s00348-005-0949-9
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发表时间：
2005-05
影响因子：
2.4
通讯作者：
R. Pattenden;S. Turnock;Xin Zhang
中科院分区：
文献类型：
--
作者：
R. Pattenden;S. Turnock;Xin Zhang
本文采用表面流场显示、粒子图像测速（PIV）和表面压力测量等方法，研究了一端固定在地平面上，另一端自由的有限高圆柱绕流问题。基于直径的雷诺数为200，000。平均流拓扑结构已被确定在三个领域：马蹄涡系统，自由端和尾流区的分离流。有证据表明存在一个三马蹄涡系统，而自由端的平均流量由一个拱形涡与其基地上的前半部分的自由端。自由端有两个叶尖涡。尾流区被发现是高度不稳定的，从平均流有相当大的变化。
The flow over a finite-height cylinder of aspect ratio 1, with one end mounted on a ground plane and the other end free, has been studied by means of surface flow visualisation, particle image velocimetry (PIV) and surface pressure measurements. The diameter-based Reynolds number was 200,000. The mean flow topology has been identified in three areas: the horseshoe vortex system, the separated flow over the free-end and the wake region. Evidence is shown for the existence of a three-horseshoe vortex system, while the mean flow over the free-end consists of an arch vortex with its bases on the forward half of the free-end. There are two tip vortices coming off the free-end. The wake region is found to be highly unsteady, with considerable variation from the mean flow.