基于实验的浮式圆柱体涡激运动研究

摘要

In order to study vortex induced motions (VIM)response of a floating cylinder,its model tests were performed in a water flume under the reduced velocity range of 1 .3 to 1 0.2.Considering the aspects of response amplitude and vortex shedding frequency,VIM responses of the cylinder with and without helical strakes were measured.It was shown that for the cylinder without helical strakes,“lock in”phenomena occur under the reduced velocity range of 5.5 to 8;after adding to the cylinder helical strakes to the cylinder,the effect of suppressing VIMis obvious and the phenomena of “lock in”are not obvious;under fluid-structure interaction,the VIM sway frequency of the cylinder is on longer coincident with the varying law of Strouhal frequency.%为研究浮式圆柱体在均匀流下涡激运动响应，对其进行了水槽模型实验研究。测试了约化速度自1．3～10．2范围内的有、无螺旋侧板圆柱的运动响应，从响应幅值、涡泄频率等多个角度出发，分析了其涡激运动的关键特征。研究表明：裸圆柱在约化速度5．5~8之间发生锁定现象，增加螺旋侧板后抑制涡激运动效果显著，且无明显锁定现象；流固耦合作用下，涡激运动横荡频率不再符合斯托哈尔频率变化规律。