二维矩形突起物绕流流动结构的实验研究

Experimental Research on the Obstacle Flow structure of 2D Rectangular

流场中旋涡的生成与演化与二维矩形突起物上游的流动分离有着密切的关系,本文利用PIV技术,对在均匀来流条件下无压流流道内底壁矩形突起物流动的二维瞬时流速场进行了测量,得到了湍流情况下,不同台阶比(h1/h)为2和4时流场中旋涡的生成发展与演化的一般规律。本文分析了两种工况下流场中的旋涡结构的特点和突起物上、下游及顶部旋涡的运动特性和细部特征。

Making use of the PIV technology, this paper is an analysis of the characteristics of vortex structures in the flow field under the two kinds of working condition, the upstream and downstream of obstacle, the movement characteristics of top vortex and its detail characteristics.