水流攻角对有限长圆柱涡激振动影响机理研究  

Study on the influence mechanism of water attack angle on vortex-induced vibration of a finite-cylinder

作　　者：段德荣[1] 代森良 王慕豪 张晓娅 张辉[1] 杨学锋[1] DUAN Derong;DAI Senliang;WANG Muhao;ZHANG Xiaoya;ZHANG Hui;YANG Xuefeng(School of Mechanical Engineering,University of Jinan,Jinan 250022,China)

机构地区：[1]济南大学机械工程学院,济南250022

出　　处：《振动与冲击》2025年第8期80-88,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51905211);山东省自然科学基金(ZR2022ME041)。

摘　　要：海工装备中有限长圆柱不同的工作姿态会产生不同的水流攻角冲击作用,为了揭示水流攻角对有限长圆柱涡激振动响应的影响机理,采用三维非定常雷诺平均Navier-Stokes方程和剪切应力传输k-ω模型,对不同攻角下有限长圆柱进行双向流固耦合数值计算,并通过试验验证了数值结果的准确性。研究结果表明,攻角的增大会使结构两侧流体流速不平衡加剧,升力和阻力均增大,且升力比阻力变化明显,导致有限长圆柱的振动响应随攻角增大而提高。当攻角由0°增大到2°和4°时,自由端横流向振幅分别增加了7.3%和21.2%,顺流向振幅分别增加了6.3%和24.6%,顺流向涡激振动的振动主频不再是横流向的2倍。由于自由端和固定端的存在,干扰了圆柱后方漩涡的形成和脱落,攻角越大,尾流漩涡脱落的宽度越宽,有限长圆柱振动幅值越大。Different working postures of finite-length cylinders in marine engineering equipment will produce different impact effects of water flow angle of attack.In order to reveal the influence mechanism of water flow angel of attack on the vortex-induced vibration response of finite-length cylinders,the three-dimensional unsteady Reynolds-averaged Navier-Stokes equation and the shear-stress transport k-ωturbulence model were used.The two-way fluid-structure interaction numerical calculation of finite-length cylinders at different angles of attack was carried out,and the accuracy of the numerical results was verified by experiments.The results show that the increase of the angle of attack will aggravate the imbalance of fluid velocity on both sides of the structure,and the lift and drag will increase,and the change of the lift is more obvious than that of drag,which lead to the increase of the vibration response of the finite cylinder with the increase of the angle of attack.When the angle of attack increases from 0°to 2°and 4°,the amplitude of the free end cross flow increases by 7.3%and 21.2%,and the amplitude of the in-line increases by 6.3%and 24.6%.The vibration frequency of the in-line vortex-induced vibration is no longer twice that of the cross-flow.Due to the existence of the free end and the fixed end,the formation and shedding of the vortex behind the cylinder are disturbed.The larger the angle of attack,the larger the width of the wake vortex-shedding,and the larger the vibration amplitude of the finite-length cylinder.

关 键 词：水流攻角 涡激振动 流固耦合 有限长 自由端 

分 类 号：TH113[机械工程—机械设计及理论]