高雷诺数时分隔板对圆柱涡致振动的影响  

Effect of Splitter Plate on Vortex-Induced Vibration of Circular Cylinder at High Reynolds Number

作　　者：丁林[1,2] 张力[1,2] 杨仲卿[1,2] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030 [2]重庆大学动力工程学院,重庆400030

出　　处：《机械工程学报》2013年第14期133-139,共7页Journal of Mechanical Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20120191130003)

摘　　要：钝体后安装分隔板是一种有效的被动控制技术,针对弹性支撑的圆柱-分隔板系统,采用有限体积法,求解雷诺平均的Navier-Stokes方程和使用Spalart-Allmaras一方程湍流模型,对非稳态湍流的圆柱-分隔板系统绕流进行数值计算。研究高雷诺数(1.5×104<Re<8×104)下,1D(D为圆柱直径)长的分隔板对圆柱涡致振动及其近尾迹流动特性的影响,将结果与没有分隔板时的圆柱绕流进行对比。结果表明,高Re数时分隔板的存在并没有减小圆柱振幅,振幅随Re数增加而持续增大;圆柱-分隔板结构的振动频率比单独的圆柱绕流时低,振动频率与固有频率比值保持在0.4附近;圆柱-分隔板结构后尾流旋涡出现2S模式,而没有分隔板时为2P模式。分隔板推迟尾流区剪切层间的相互作用,对圆柱涡致振动的抑制作用随着速度的降低逐渐加强。Adding a splitter plate at the wake centreline of a bluff body is an efficient passive technique of controlling fully developed vortex shedding. In the present study, unsteady turbulent flow around a circular cylinder with a splitter plate is numerically studied with the finite-volume method in high Reynolds number range of 1.5×104〈Re〈8×104. The fluid flow is modelled using the （Reynolds-averaged Navier-Stokes, RANS） equations together with the one-equation Spalart-Allmaras turbulence model. The effect of a 1 diameter-splitter plate on vortex-induced vibration of circular cylinder and near-wake flow characteristics is investigated. Numerical results are compared with that for cylinder without plate. The results indicate that the amplitude for the cylinder-plate combination increases with the increase of Re and the frequency is lower than that for the no-plate-cylinder. In addition, 2S vortex structure is observed for the cylinder-plate body and 2P for the cylinder without plate. The splitter plate inhibits communication between the two shear layers on either side of the cylinder and the suppression of vortex-induced vibration is enhanced as the velocity decrease.

关 键 词：圆柱 分隔板 旋涡脱落 涡致振动 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]