钝体后安装分隔板是一种有效的被动控制技术,本文采用有限体积法对非稳态二维层流下的圆柱-分隔板结构绕流进行了数值计算。研究了中等雷诺数（Re=100～500）下,分隔板与来流方向存在夹角时（θ=0°～45°）的圆柱绕流特性。结果表明不同Re数下,圆柱阻力和升力系数等反映流动特性的参数随分隔板偏角而变化;阻力系数最小值对应的分隔板偏角随着Re数的增加而减小,圆柱升力与分隔板偏角的大小呈正比;在Re≥300时,随分隔板偏角的增大,旋涡形成区长度减小,斯特努哈尔数Sr在θ=20°时出现峰值。
Adding a splitter plate at the downstream of the bluff body is an efficient passive mean of controlling vortex shedding.In this study,two-dimensional unsteady laminar flow over a circular cylinder near a splitter plate was investigated with finite-volume method.Numerical simulations were done for moderate Reynolds numbers ranging from 100 to 500 in different angles between splitter plate and wake centerline（θ=0°～45°）.Results indicate that the drag and lift coefficients representing the flow characteristics vary as a function of the angle at different Reynolds numbers.The drift angle relating to the minimum value of drag coefficient decreases with the increasing of Re and the lift is proportionate to the angle.When Reynolds numbers are more than 300,the length of the vortex formation is inversely proportional to the angle,and there is a peak value in Strouhal number atθ=20°.
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