Experimental Study on the Flow Around Two Tandem Cylinders with Unequal Diameters

查看全文 作　　者：GAO [1,2]Yangyang;ETIENNE [3]Stephane;WANG [4]Xikun;TAN Soon [4]Keat

机构地区：[1]Ocean College, Zhejiang University;[2]State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography, SOA;[3]Mechanical Engineering Department, Ecole Polytechnique de Montreal;[4]Maritime Research Centre and School of Civil and Environmental Engineering, Nanyang Technological University

出　　处：《Journal of Ocean University of China》索引2014年第13卷第5期,共10页

基　　金：supported by the Zhejiang Provincial Natural Science Foundation of China under Grant No. LY14E090009;State Key Laboratory of Satellite Ocean Environment Dynamics (Second Institute of Oceanography, SOA), State Key Laboratory of Fluid Power Transmission and Control (GZKF-201310);State Key Laboratory of Ocean Engineering, China. The National Research Foundation of Singapore (NRF-CRP5-2009-01);Maritime Research Centre and Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore, is acknowledged 摘　　要：In this paper, flow around two circular cylinders in tandem arrangement with unequal diameters has been investigated using the particle image velocimetry technique(PIV) in a water channel. The upstream to downstream diameter ratio was kept constant at d/D = 2/3, the centre-to-centre distance was varied from 1.2D to 5D and the Reynolds number was varied from 1200 to 4800. The flow characteristics were analyzed through ensemble-averaged patterns of velocity, vorticity, normalized Reynolds stress contours and streamlines. Based on ensemble-averaged and instantaneous flow fields, different flow patterns, including single-wakeshedding at small spacing ratio, bi-stable flow behavior(alternating behavior of reattachment and vortex shedding) at intermediate spacing ratio and co-shedding pattern at large spacing ratio were observed. The effects of Reynolds number and the centre-to-centre spacing ratio on flow patterns and turbulent characteristics were also investigated. It was found that the diameter ratio appears to have a certain effect on the flow patterns at intermediate spacing ratios, where the reattachment of shear layer depends on the lateral width of the wake flow in the lee of the upstream cylinder. Extensive discussion on the distributions of Reynolds stress and turbulent kinetic energy was presented. 关键词：流动特性直径比串联粒子图像测速法实验气缸流动模式流动行为

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Experimental Study on the Flow Around Two Tandem Cylinders with Unequal Diameters

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