附有Savonius叶轮结构的圆柱体流致旋转耦合涡激振动数值研究  

Numerical study on the flow-induced rotation coupled with vortex-induced vibration of a cylinder with Savonius impeller structure

作　　者：刘馨涵 娄敏[1] 王宇 李想 LIU Xinhan;LOU Min;WANG Yu;LI Xiang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Kunming Shipborne Equipment Research and Test Center,China Shipbuilding Industry Corporation,Kunming 650216,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]昆明船舶设备研究试验中心,昆明650216

出　　处：《振动与冲击》2024年第10期98-105,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(U2006226)。

摘　　要：针对附有Savonius叶轮结构的新型圆柱体能量转换装置开展数值模拟研究,利用用户自定义函数与SST k-ω湍流模型实现流固耦合,探究附有不同椭圆度Savonius叶轮结构的圆柱体流致旋转及振动响应,揭示结构流致旋转与涡激振动耦合作用机理。研究结果表明,叶轮结构的椭圆度是影响圆柱体横流向位移的关键,对于椭圆度相同的圆柱体,投影面积是影响顺流向位移的重要因素。低约化速度下,圆柱体不稳定旋转,形成非对称流动尾迹,表现出P+S尾迹模式。高约化速度下,圆柱体沿顺时针方向稳定旋转,旋转角速度大小呈现周期性波动。在同一旋转周期内,叶轮结构椭圆度越小,圆柱体瞬时扭矩系数绝对值越大。A novel cylindrical energy conversion device with Savonius impeller structure was numerically simulated,incorporating user-defined functions and the SST k-ωturbulence model to achieve the analog of fluid-structure coupling.The flow rotation and vibration response of the cylinder with Savonius impeller structure of different ellipticities were investigated.The mechanism of coupling between flow rotation and vortex-induced vibration was revealed.The results show that the impeller structure ellipticity is the key to influence the transverse flow displacement of the cylinder.For cylinders with the same ellipticity,the projected area is an important factor affecting the downstream displacement.At low reduction velocities,the cylinder rotates unsteadily,forming an asymmetric flow wake,and showing a P+S wake pattern.At high reduction velocities,the cylinder rotates steadily in the clockwise direction,and the rotational angular velocity fluctuates periodically.In an identical rotation period,cylinders with smaller impeller structure ellipticities exhibit larger absolute values of the cylinder’s instantaneous torque coefficient.

关 键 词：流致旋转 涡激振动 Savonius叶轮 椭圆度 

分 类 号：TK7[动力工程及工程热物理—流体机械及工程] O327[理学—一般力学与力学基础]