Characteristics of Wake Flows behind a Diamond-shaped Cylinder

S. Umeda, Wen‐Jei Yang, Hidetomo Kanbara
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引用次数: 1

Abstract

The turbulence flow around a square or diamond-shaped cylinder has received far less attention than the flow around a circular cylinder. An experimental study was performed to visualize the wake flows behind a diamond-shaped cylinder. Several kinds of aspect ratios d/w and b/w were selected in the experiment, where w was a width of the cylinder, d and b were a depth and width of the duct, respectively. The wake flows were visualized at a top view, a side view and rear views using the fluores-cein dye illuminated by a laser light sheet. The velocity variations in the flow field were measured using two-dimensional laser Doppler velocimetry. It is shown that the three dimensional longitudinal vortices appear in the wake flows behind the diamond-shaped cylinder. The characteristics of the turbulence in the wake flows behind it are clarified.
菱形圆柱后尾流的特性
围绕方形或菱形圆柱体的湍流比围绕圆形圆柱体的湍流得到的关注要少得多。对菱形圆柱体后尾流进行了可视化实验研究。实验中选取了几种宽高比d/w和b/w,其中w分别为筒体宽度,d和b分别为风管深度和宽度。尾流在顶视图、侧面视图和后视图上可视化,使用由激光片照射的荧光素染料。用二维激光多普勒测速仪测量了流场中的速度变化。结果表明,在菱形圆柱后的尾流中存在三维纵向涡。阐明了其后面尾流的湍流特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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