充液管道中弯头流固耦合振动分析数学建模研究

Research on Mathematical Modelling for Elbow Fluid Solid Interaction Vibration Analysis in Liquid Filled Pipe

基于特征线14方程模型,对充液管路系统中弯头处的流固耦合进行了建模研究,得出了弯头处的平衡方程,通过C++软件开发管道流固耦合时域响应计算程序,结合文献算例验证了建模的正确性,研究了弯头对管道流固耦合振动特性的影响。结果表明,和直管相比,弯接头的存在能够降低流固耦合作用中流体压力和管道所受轴向应力脉动的峰值;弯头角度为90°时,弯头处流体压力脉动以及管道轴向应力脉动的峰值最小。

Based on the characteristic equation of 14 equations,the modeling of elbow coupling in liquid filled pipe system is researched on,and the equilibrium equation at the elbow is given out,through the software based on the MOC method and compared with examples,the correctness of the modeling is verified.The influence of the elbow on fluid structure interaction is studied.The results show that the existence of the curved joints can reduce the pulse peaks of fluid pressure and axial stress in the pipeline,compared with straight pipe.When the angle of the elbow is 90 degree,the peak values are minimal.