充液直管管系中的固-液耦合振动响应分析

Fluid-Structure Interaction of the Straight Liquid-Filled Piping System

对充液直管管系中固 -液耦合 (包括连接、泊松、摩擦耦合 )对管系轴向振动响应的影响进行了研究。研究结果表明 ,固 -液耦合作用对充液管道系统振动响应影响不容忽视 ;三种固 -液耦合作用中 ,摩擦耦合影响较小 ,连接耦合与泊松耦合影响较大 ,并且其影响机理受到阀门关闭速度的影响 ;当阀门关闭较快时 ,系统响应以水锤响应激励下由连接耦合带来的受迫振动为主 ;当阀门关闭较慢时 ,系统以由连接耦合与泊松耦合带来的管道应力波为主。

Axial vibrational response of a liquid-filled piping system is simulated by using the Method of Characteristics(MOC). The response is calculated with and without considerng FSI by using the classic and extended waterhammer equations. The effect of three basic coupling mechanics(junction, Poisson and friction coupling) is studied. The numerical analysis shows that the friction coupling is less important, while the junction and Poisson coupling cannot be ignored and the effect of these two coupling is affected greatly by the valve closure time. When the valve closes rapidly, the junction coupling is most important and the forced response caused by waterhammer is dominant in systems; when the valve closes slowly, the effect of the stress waves in the pipe caused by junction and Poisson coupling is greater.