低雷诺数下两类串列圆柱的涡激振动  

Vortex-induced vibration of two types of tandem circular cylinders at low Reynolds number

作　　者：杜晓庆[1,2] 邬伟伟 赵燕[1] 吴葛菲 DU Xiao-qing;WU Wei-wei;ZHAO Yan;WU Ge-fei(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Aerodynamic Flow Control Research Center,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学土木工程系,上海200444 [2]上海大学风工程和气动控制研究中心,上海200072

出　　处：《振动工程学报》2021年第2期283-291,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51578330)。

摘　　要：为了研究上游圆柱的运动状况对下游圆柱涡激振动的影响,针对两类串列双圆柱(上游圆柱固定、下游圆柱可作两自由度振动,上下游圆柱均可作两自由度振动),在低雷诺数下(Re=100),采用数值模拟方法,研究了下游圆柱在不同尾流干扰下的振幅、振动频率、相位差等振动特性随折减速度的变化规律,从能量输入和尾流模态角度探讨了上游圆柱的振动状况对下游圆柱涡激振动的影响规律及其流场机理。研究表明:上游圆柱的运动状况对下游圆柱涡激振动有显著影响;与上游圆柱固定情况相比,上游圆柱振动时下游圆柱存在明显的振动锁定区间;下游圆柱横流向振幅更大且最大振幅发生在更高的折减风速下。振动过程中两类串列圆柱的顺流向间距比明显不同。上游圆柱固定时,顺流向圆柱间距大于上游圆柱振动情况。两类双圆柱的尾流模态也有明显不同,上游圆柱固定、下游圆柱振动时的串列双圆柱为平行涡街模态,而上下游圆柱均能振动时的尾流为“2S”模态。In order to clarify the effect of the motion of the upstream cylinder on the vortex-induced vibration of the downstream cylinder,two different cases,namely whether the upstream cylinder is fixed or not,are taken into consideration.Numerical simulation is employed to investigate the vortex-induced vibration of the downstream cylinder at Re=100.The vibration characteristics,including amplitudes,vibration frequencies and phase lags between two cylinders,are discussed with the variation of reduced velocity.The wake flow structures and energy input mechanisms of the vortex-induced vibration are explored.Results show that the vibrating condition of the upstream cylinder imposes a significant influence on the vortex-induced vibration of the downstream cylinder.Compared with the condition of a fixed upstream cylinder,an obvious lock-in phenomenon is observed when the upstream cylinder can vibrate in two-degree-of-freedom and the downstream cylinder is subjected to a larger transverse amplitude and the maximum amplitude occurs at higher reduced velocity.In addition,the flow structures around two cylinders are different in the two cases when the downstream cylinder undergoes maximum amplitude.Parallel vortex street mode is observed when the upstream cylinder is fixed,whereas‘2S’wake mode is inspected when the upstream cylinder is allowed to vibrate.

关 键 词：涡激振动 串列双圆柱 尾流干扰 数值模拟 尾流模态 

分 类 号：O351.2[理学—流体力学] TU311.3[理学—力学]