来流条件对旋转圆柱双自由度涡致振动的影响  

The Effect of Inflow Condition on the Vortex-Induced Vibration of a Rotating Circular Cylinder With Two Degrees of Freedom

作　　者：丁林[1,2] 孔浩 邹群峰 张力[1,2] DING Lin;KONG Hao;ZOU Qunfeng;ZHANG Li(Key Laboratory of Low-Grade Energy Utilization Technologies and Ministry of Education,Chongqing University,Chongqing 400030,China;School of Energy and Power Engineering,Chongqing University,Chongqing 400030,China)

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]重庆大学能源与动力工程学院,重庆400030

出　　处：《工程热物理学报》2022年第12期3258-3265,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51776021);重庆市自然科学基金面上项目(No.cstc2020jcyj-msxmX0813);中央高校基本科研业务费(No.2020CDJ-LHZZ-045)。

摘　　要：结构流致振动是流体机械及动力工程设备中与安全相关的重要问题。本文通过数值方法研究了三种典型平面来流条件下刚性旋转圆柱的涡致振动。双自由度旋转圆柱可以在来流和横流方向自由振动。在折减速度范围为3≤U^(*)≤12内,圆柱在来流方向的最大振幅为0.375D,横流方向的最大振幅为0.738D。旋转增强了圆柱来流方向的振幅,抑制了横流方向的振幅。对于非旋转圆柱,均匀来流和非线性来流下圆柱运动轨迹为“8”字形,剪切流作用下可以观察到“水滴”形运动轨迹;对于旋转圆柱,三种来流条件下的运动轨迹都呈现椭圆形。旋转产生的马格努斯效应使圆柱的平衡位置由初始位置向下偏移,在圆柱的近尾流中可观察到2S和S+P的旋涡脱落模式。Flow-induced vibration of structure is an important safety-related issue in fluid machinery and power engineering equipment.In this paper,the vortex-induced vibration (VIV) of a rigid rotating cylinder under three typical planar flow conditions is investigated numerically.The rotating cylinder with two degrees of freedom (2DOF) can vibrate freely in streamwise and cross-flow directions.Within the range of reduced velocity 3≤U^(*)≤12,the maximum amplitude of the cylinder in the streamwise direction is 0.375D,and the maximum amplitude in the cross-flow direction is 0.738D.The rotation enhances the amplitude of the cylinder in the streamwise direction and suppresses the amplitude in the cross-flow direction.For the non-rotating cylinders,the movement trajectory of the cylinder in uniform flow and nonlinear flow is“8”-shaped,while when the shear flow acts on the non-rotating cylinder,the“droplet”-shaped movement trajectory can be observed.For the rotating cylinder,the trajectories in the three inflow conditions present elliptic.The Magnus effect caused by the rotation offsets the equilibrium position of the cylinder downward from the initial position.The vortex shedding patterns of 2S and S+P can be observed in the near-wake of the cylinder.

关 键 词：涡致振动 双自由度 来流条件 旋转圆柱 马格努斯效应 

分 类 号：TK7[动力工程及工程热物理—流体机械及工程] O325[理学—一般力学与力学基础]