并列双圆柱尾迹被动控制中流场特性的实验研究  

An experimental study on the characteristics of the flow field behind two side-by-side circular cylinders under passive wake control

作　　者：张洪军[1] 苏中地[1] 尹招琴[1] 

机构地区：[1]中国计量学院,杭州310018

出　　处：《水动力学研究与进展（A辑）》2004年第6期702-708,共7页Chinese Journal of Hydrodynamics

基　　金：浙江省自然科学基金(M103037)

摘　　要：　本文采用一个与主圆柱平行的小圆柱对并列双圆柱(中心距为1.5D,其中D为圆柱直径)的旋涡脱落进行被动控制。研究中,基于圆柱直径的雷诺数Re=5900。控制小圆柱被放置于并列双圆柱下游中心线上L=0～2D的距离上,其中L为控制小圆柱和并列双圆柱之间的距离。采用热线风速仪测量了并列双圆柱下游10倍直径处截面上的瞬时速度,得到了平均速度剖面和雷诺应力分布,同时测量了并列双圆柱的表面压力分布。通过分析测量结果发现,当控制小圆柱距离较近时,例如,L/D≤0.5,小圆柱对旋涡脱落和流场的控制作用非常明显,流场上下对称。而当L/D≥1.0时,小圆柱不能抑制宽窄流的出现,其对流场的控制作用大为降低。Vortex shedding passive control of two side-by-side cylinders was experimentally investigated in which a small circular cylinder parallel to the main cylinders was used as a controller. The spacing between the two main cylinders is 1.5D, where D is the diameter of the cylinder, and the Reynolds number based on the cylinder diameter is 5900. The small control cylinder was placed in the central line behind the two main cylinders with a distance to the main cylinders of L=0～2D, where L is the distance between central lines of the main and the contolling cylinders. Hot wire anemometry was used to measure the instantaneous flow velocities at the plane of 10D downstream of the main cylinders, and the mean velocity profile and Reynolds stress distributions were obtained. It was found that when the small controlling cylinder was placed very close near to the main cylinder, say L/D≤0.5, vortex shedding process and the flow pattern were controlled very well, and the flow field was symmetric to the flow central line. At L/D≥1.0, the controlling cylinder can not suppress the occurring of wide and narrow flow pattern, and its control effect became much less.

关 键 词：旋涡脱落 并列双圆柱 尾流的被动控制 风洞试验 

分 类 号：O357.52[理学—流体力学]