摘要
流场中旋涡的生成、演化与二维矩形突起物上游的流动分离有着密切的关系,该文利用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。文中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。
Vortex generation and evolution in the flow field is closely related to the flow separation around a submerged rectangular obstacle. On condition that the flow in upstream of 2D rectangular obstacle is uniform, particle image velocimetry （PIV） is used to measure and visualize the transient velocity field of 2D flow over a rectangular obstacle in open ditch in this paper. The laws of the coherent vortex and its course of generation, development and evolvement under the different step ratio （ h/h1 =2, 4） in turbulent flow are unveiled. The vortex structures, the movement performances and detail characteristics of vortex in upstream, downstream and top of obstacle under the two cases are analyzed.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2006年第3期388-394,共7页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助(50479035)
关键词
PIV
突起物流动
旋涡结构
细部特征
PIV
flow over 2D rectangular obstacle
vortex structures
detail characteristics
