【作者】 徐万海； 张书海； 马烨璇； 高喜峰；

【Author】 XU Wan-hai;ZHANG Shu-hai;MA Ye-xuan;GAO Xi-feng;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University;

【机构】 天津大学水利工程仿真与安全国家重点实验室；

【摘要】 柔性圆柱结构的流激振动是一种常见的流-固耦合现象,是引起结构疲劳损伤的重要因素。在来流作用下,柔性圆柱结构会受到横流向升力的作用。升力会引起结构在横流向的运动,是影响结构流激振动和疲劳损伤的重要参数之一。实际工程应用中,圆柱结构通常以多柱排布的形式出现,其中并列排布是一种重要的排布方式,圆柱间的尾流相互作用会对结构的水动力特性产生明显的影响。已有研究大多关注两根并列圆柱情形,对于两根以上柱群的研究明显不足。本研究设计了单圆柱和并列多圆柱流激振动的拖曳水池模型实验,获取了结构位移响应的实际测量数据。通过反解方法确定结构的升力系数,并进一步分析柔性圆柱的平均升力系数随约化速度的变化规律,以及升力系数在圆柱结构轴向的分布规律。通过对单圆柱,并列二/三/四圆柱的升力系数的对比研究,探寻升力系数在不同数目圆柱并列排布情形下的变化规律。更多还原

【Abstract】 Flow-induced vibration is one common type of fluid-structure interaction and may lead to the fatigue damage of the structure.When the flexible cylinder is placed in the flow field,it will be affected by the lift force and present marked oscillation in CF direction.Multi-cylinder system is more widely employed in practical engineering applications,in which side-by-side arrangement is an important arrangement form.However,relevant investigations on multiple side-by-side flexible cylinders composed of more than two cylinders are still very limited.The present work obtains the lift force coefficients through a series of inverse calculation methods.Further investigation on the relationship between the lift coefficients and oscillation displacement amplitude,reduced velocity are also presented.更多还原