应用PIV进行二维后向台阶流流动特性的研究(1)二维后向台阶流的旋涡结构的研究  

Investigation of vortex structure of the 2D backward facing step flow via PIV

作　　者：齐鄂荣[1] 黄明海[2] 李炜[1] 李国亚[1] 张昕 吴剑[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072 [2]长江科学院水力学所,湖北武汉430010 [3]中南建筑设计院设备所,湖北武汉430071

出　　处：《水动力学研究与进展（A辑）》2004年第4期525-532,共8页Chinese Journal of Hydrodynamics

摘　　要：　利用PIV技术,对二维后向台阶定常流的瞬态速度场进行了测量,得到层流至湍流情况下定常流流场中旋涡的生成、发展和演化的现象和规律。本文分析了各种情况下旋涡结构特点、讨论了与时均流场和自由剪切层的区别,还给出了二维后向台阶流的拓扑结构。In the Reynolds number range of 150<Re<6500,particle image velocimetry (PIV) is used to measure and visualize the transient velocity field of the 2D steady flow over a backward facing step. The rules of the coherent vortex and its course of generation, development and evolvement in steady flow are unveiled. The vortex structures under some instances are analyzed. The difference with time-mean velocity field and free shear layer is discussed, and a reasonable description of the topological characteristics of the vortex structure in the flow over a backward-facing step is given.

关 键 词：PIV 后向台阶流 旋涡结构 拓扑分析 

分 类 号：TV135[水利工程—水力学及河流动力学]