Abstract: Based on the four － equation model describing the fluid structure interaction （FSI） in axial vibration for liquid －
filled piping system ， the effects of Poisson ，friction and junction coupling on the axial response of the piping system were
studied ．The method of characteristics （MOC） was described in detail and the transient response of the reservoir － pipe － valve
system to instantly valve closure was numerically simulated ．The numerical analyses show that the FSI can not be ignored ．The
Friction coupling is less important while the junction and Poisson coupling are more important ．The common calculation models
of pressure wave speed were reviewed ，the optimization calculation model was recommended and the effects of void fraction on
the speed were analyzed ，aiming at providing a theoretical guide for further study of the FSI analysis of gas － liquid two － phase
flow pipes

Key words: Fluid structure interaction , Method of characteristics , Gas － liquid two － phase flow , Void fraction , Pressure wave velocity

摘要： 基于充液管系轴向流固耦合振动4方程模型,研究了连接耦合、泊松耦合、摩擦耦合 3种形式对充液管道振动响应的影响。介绍了特征线法求解过程,并对水箱-直管-阀门(RPV)管系在阀门瞬间关闭时的瞬态响应进行了数值仿真计算。结果表明,流固耦合作用对充液管道振动响应有较大影响。3种耦合作用中,摩擦耦合影响较小,连接耦合与泊松耦合影响较大。针对气液两相流动,列举了常用的压力波速计算模型,优选了合适的波速计算表达式,分析了含气率对压力波速的影响,旨在为进一步研究气液混输管道流固耦合振动提供一定的理论指导。

关键词: 流固耦合 , 特征线法 , 气液两相流 , 含气率 , 压力波速