圆柱体绕流分离区流动特性

一、引言 绕圆柱体流动从开始就是流体力学的研究对象,但直到今天仍有许多遗留问题有待研究解决。例如尾流中涡街形成的机理,尾迹中涡量减少的机理等。 本文介绍了用一种新的测量方法（即热线和热膜的整流效应）,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实验研究的结果。同时,用了底层隔板对圆柱体表面流动方向进行了检测。

THE CHARACTERISTICS OF SEPERATED FLOW AROUND A CIRCULAR CYLINDER

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