输水管道流固耦合振动数值计算

采用特征线法对输水管道流固耦合振动响应进行数值计算,管道的运动采用4-方程模型描述。研究管道分段时所采用的波速对数值计算结果的影响,以及管道结构阻尼对系统响应的影响。结果表明:采用特征线法求解输水管道系统流固耦合振动响应时,应采用最小波速对管道分段;管道的结构阻尼对系统响应的影响大于液体与管道之间的摩擦阻尼,可以使系统的振动快速衰减。

Numerical Calculation of Fluid-Structure Coupling Vibration of a Water Pipeline

Numerical calculation on fluid-structure coupling vibration responses of a water-conveying pipe was carried out by the method of characteristics (MOC), and four-function model was adopted in the calculation. Researches about the influence of wave speed adopted in pipe-dividing on numerical calculation results and the influence of pipe structure-damping on vibration responses of water-conveying pipe were completed, the numerical results showed that the least wave speed (liquid pressure wave speed for four-function model) should be adopted to divide pipes to get fluid-structure coupling vibration responses of fluid-conveying pipe by MOC, and pipe structure-damping has more obvious effect on the vibration responses of the water-conveying pipe than friction between pipe and liquid, and the pipe structure-damping decays the vibration of the system fast.