L管气液两相内流致振的流固耦合数值模拟  

Fluid-solid Coupling Numerical Simulation of L Pipe Vibration Induced by Gas-liquid Two Phase Internal Flow

作　　者：谢翠丽[1] 王志远[1] Xie Cuili;Wang Zhiyuan(China University of Petroleum(Huadong))

机构地区：[1]中国石油大学(华东)

出　　处：《石油机械》2019年第4期124-128,共5页China Petroleum Machinery

基　　金：国家自然科学基金项目"油气井多相流动理论及应用"(51622405)

摘　　要：为研究气液两相混输管道的内流导致管道破坏的机理,利用ANSYS Workbench软件,建立L形弯管有限元模型和气液两相CFD模型,进行L形弯管内流致振的流固耦合数值模拟。研究结果表明:流体水平冲向弯头后动量发生改变,最大压力出现在弯角处;加载预应力的管道模态计算的频率比不加预应力的管道模态计算的频率略有增大,但幅度甚微;两相流动在垂直方向(y)上产生的振动最小,在水平方向(x)上的振动幅度次之,最大振动出现在没有固定约束的z方向;最大位移点应力随时间周期性变化,且变化幅度逐渐减小;两相流频率接近管道的2阶固有频率,易产生共振,因此应在z方向加固定约束。研究结果有助于解决海上平台管路振动问题。To study the mechanism of pipeline failure caused by the inflow of gas-liquid two-phase flow pipeline, the ANSYS Workbench software was used to establish the L-shaped pipe finite element model and the gas-liquid two-phase CFD model for investigating in the pipe vibration induced by internal flow. The results show that the fluid momentum changes when the fluid rushes to the L-shaped pipe horizontally, and the maximum pressure appears at the corner.The calculated frequency of the mode of the prestressed pipeis slightly larger than that of the mode of pipe without prestressing. However, the difference is very small.The two-phase flow produces the smallest vibration in the vertical direction( y ), and the second large vibration amplitude in the horizontal direction( x ), and the maximum vibration in the z direction without the fixed constraint.The stress of the maximum displacement point varies periodically over time, and the magnitude of the change gradually decreases. The two-phase flow frequency is close to the second-order natural frequency of the pipeline, and is easy to produce resonance. Therefore, a fixed constraint should be added in the z direction to prevent the pipeline vibration. The study could help to address the pipeline vibration on offshore platforms.

关 键 词：两相流 振动 流固耦合 固有频率 ANSYS 

分 类 号：TE973[石油与天然气工程—石油机械设备]