各种间隙比下水平圆柱绕流特性的实验研究  

Experimental Study of the Characteristics of the Flow around a Horizontal Cylinder at Various Gap-Ratios

作　　者：齐鄂荣[1] 李国亚[2] 李炜[1] 吴剑[1] 张昕 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]中国三峡总公司,宜昌443002 [3]中南建筑设计院,武汉430071

出　　处：《实验力学》2006年第5期617-623,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金资助(50479035)

摘　　要：采用粒子图像测速仪（PIV）和超声测速仪（ADV）系统，对间隙比G为0．0～7．0（即为圆柱与底壁相接触时至圆柱与水面相接触时）浅水横流水平圆柱绕流流动进行了系统实验研究。根据所测结果，讨论了在各种间隙比情况下圆柱上、下游的紊动强度、雷诺应力沿水深的分布规律；分析了在各种间隙比情况下旋涡的生成、发展和演化的现象和规律；分析了瞬时数据时均化后的时均流场结构特性；比较了瞬时流场和时均流场的特点及差别。本文成果对具有类似流动特点的工程问题具有指导意义。In the gap-ratio range of 0. 0≤G≤7.0, a systematic experimental research of the flow around a horizontal cylinder in the cross-flow of shallow water is conducted by a particle image velocimeter PIV and ADV. Based on the obtained experimental data, the distribution rules of turbulent intensity and Reynolds stress in up and downstream of the circular cylinder at various gapratios are discussed. The phenomena and rules of the vortex and its course of generation, development and evolvement at various gap-ratios are analyzed. The characteristics of the time-averaged flow field structure from the transient flow data by PIV are analyzed. The differences between the transient flow field and the time-averaged flow field and the characteristics of the vortex structures are analyzed. The findings of this paper are of guiding significance for engineering with similar flowing features.

关 键 词：PIV ADV 圆柱绕流 紊动强度 雷诺应力 旋涡结构 

分 类 号：O351.3[理学—流体力学] TV135[理学—力学]