圆柱体绕流分离区流动特性

本文介绍了用热线和热膜的整流效应方法,对圆柱体绕流分离区表面以及“死水区”的时间平均流动特性进行试验研究的结果。同时,用底层隔板对圆柱体表面流动方向进行了检测。 试验结果表明,在“死水区”内,存在着与低雷诺数情况下类似的流动结构。 最后,本文对尾流中涡街形成的机理作了初步讨论。

The Characteristics of Separated Flow around a Circular Cylinder

Although the flow around a circular cylinder has been investigated for a long time, some problems still remain to be solved, such as the mechanism of Karman vortex and the reduction of vorticity in vortex street.The present paper gives some results associated with the characteristics in the "dead water region" which are experimentally investigated by means of the hot film, hot wire and sublayer fence.The results show that the flow structure of the "dead water region" at high Reynolds number is similar to that at low Reynolds number. Finally, the mechanism of the vortex street formation is briefly discussed.