圆柱单自由度和双自由度涡激振动特性研究  

SINGLE DEGREE AND TWO DEGREES OF FREEDOM VORTEXINDUCED VIBRATION OF CIRCULAR CYLINDER

作　　者：曹兴[1] 刘宇飞 于恒 孔祥鑫 李庆领[1] Cao Xing;Liu Yufei;Yu Heng;Kong Xiangxin;Li Qingling(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061,China)

机构地区：[1]青岛科技大学机电工程学院,青岛266061

出　　处：《动力学与控制学报》2020年第6期49-56,共8页Journal of Dynamics and Control

基　　金：山东省自然科学基金项目(ZR2018PEE017);青岛市应用基础研究计划项目(17-1-1-17-jch)。

摘　　要：对圆柱绕流的涡激振动过程进行了数值模拟,研究了单、双自由度下涡激振动的力学特性、振幅特性、频谱特性,探讨了单、双自由度的适用条件.结果表明,单自由度条件下,随着约化速度的增加,阻力系数时均值先增大后减小,升力系数幅值先增大后减小再增大,且进入和离开“锁定”区间时二者均会产生波动.双自由度条件下,横向与流向无量纲振幅均随雷诺数的增大先增大后减小.低质量比时,流向振动的影响不可忽略,而高质量比时,可忽略流向振动的影响.A numerical investigation on vibration characteristics of flow around a circular cylinder was carried out.This study focused on mechanic properties,such as amplitude and spectrum,of vortex-induced vibration with both single de⁃gree of freedom(DOF)and two DOFs,and the applicable conditions of these two models were also discussed.Results indicate that for single DOF vortex-induced vibration,with the increment of reduced velocity,the time-average value of drag coefficient increases firstly and then decreases,whereas the amplitude of lift coefficient trends to increase at first,then decrease,and then increase again.Moreover,both of them fluctuate when they enter or leave the locking interval.For two DOFs vortex-induced vibration,the dimensionless amplitudes of both the cross-flow and in-line vibration firstly increase and then decrease with the increase of Reynolds number.The in-line vibration cannot be neglected for low mass ratio,whereas it can be neglected for high mass ratio.

关 键 词：涡激振动 单自由度 双自由度 质量比 数值模拟 

分 类 号：O357.5[理学—流体力学]