悬臂输流管道内流自激振动稳定性分析

Stability Analysis of Flow Induced Vibration in Cantilevered Fluid-conveying Pipe

悬臂输流管道是深海采矿装备中最新颖、最具挑战性的装置之一。当管道内流体速度超过临界速度时,可能会引起管道颤振。论文研究不同管道进口流场对悬臂输流管道稳定性的影响,基于管道进口流场模型参数建立了垂直悬臂吸水管道振动控制方程,采用Galerkin方法对控制方程进行离散求解,研究了轴向流速比、流速角比和切向流速比的共同作用对悬臂管道振动临界流速和频率的影响。数值结果表明,进口流场参数对垂直悬臂吸水管道稳定性的影响非常显著。当切向流速比接近零时,临界流速随轴向流速比的增大而降低,而管道的临界频率随着轴向流速比的增大而增大;与轴向流速比,切向流速比对悬臂管道稳定性的影响更为显著。

The cantilevered fluid-conveying pipe is one of the most innovative and challenging devices in deep-sea mining structures.A flutter of the pipe may occur when the flow velocity exceeds the critical one.This paper investigates the stability of a cantilevered aspirating pipe with different inlet flows.Vibration control equations discretely solved with the Galerkin method are established for different pipe inlet flow parameters,and the effect of axial flow velocity ratio,flow angle ratio,and tangential flow velocity ratio on the critical flow velocity and vibration frequency of the cantilevered pipe are investigated.The numerical results show that the inlet flow field parameters have a significant effect on the stability of the vertical cantilevered aspirating pipe.It is found that when the tangential flow velocity ratio is close to zero,the critical flow velocity decreases with the increase of the axial flow velocity ratio,while the critical frequency of the pipe increases with the increase of the axial flow velocity ratio;when the axial flow velocity ratio increases gradually.The tangential flow velocity ratio has more great effect than the axial flow velocity ratio on the stability of cantilevered fluid-conveying pipe.