管路弯头流致振动的影响因素分析

摘要

[Objectives]As important parts of any piping system,the elbows are one of the main factors causing vibration. To have a better understanding of Flow-Induced Vibration(FIV)of elbows in piping system.[Methods]In this paper,the diameter,curvature radius,bending angle are chosen as variables, and a study of turbulence flow-induced vibration of elbow by a combined method of finite element numerical calculation and experiment is carried out,so as to obtain the effect of different curvature radius, bending angle on the fluctuating pressure and the structural vibration response of pipeline elbow under variable flow velocity.[Results]The numerical and experimental results show that the effect of the curvature radius and flow velocity on the FIV of an elbow is significant;with the increase of the curvature radius and decrease of flow velocity,the FIV decreases.[Conclusions]The research results of this paper can provide useful references for the acoustic design of piping systems.%[目的]弯头是管路系统的重要构件,在管路运行时弯头因受到流体激励而产生振动,是管路系统总体振动的主要因素之一.为了更好地理解管路弯头流致振动产生的机理,[方法]通过有限元数值计算和实验相结合的方法,针对弯头直径、曲率半径和弯曲角度等参数,开展弯头在湍流作用下的流致振动研究,以得到不同曲率半径、弯曲角度的弯头在不同管内流速下对流体脉动压强、结构振动响应的影响规律.[结果]结果表明:曲率半径和流速对弯头结构振动响应的影响明显,因此在管路系统声学设计中应高度重视.[结论]研究结果可为管路系统声学设计时的弯头结构布置提供参考和依据.