基于流固耦合的供水管道的振动特性分析

Vibration Characteristics Analysis of Water Supply Pipeline Based on Fluid Structure Interaction

铁路桥梁是列车运行线路的重要基础结构,列车在经过线路时会产生较大的振动,下穿铁路桥梁的供水管道会因为列车的经过而发生共振并造成管道破裂和腐蚀等恶劣后果。为此,基于流固耦合的分析方法,采用RNG κ-ε的湍流模型,分析管道的速度和压力分布;对比管道在自由状态下和单向流固耦合作用下的固有频率和振型。结果表明:管道内的水流速度沿着管道中心轴线的位置对称分布,水流呈现一种螺旋式环绕的趋势,在管道的弯曲处会出现紊流现象;管道在自由状态下和单向流固耦合作用下的固有频率相差8%~10%;管道在自由状态下最大的变形量为0.429 m,比单向流固耦合作用下的变形增加5%。

Railway bridge is an important foundation structure of the train running line, when the train passes through the line, it will produce large vibration, and the water supply pipeline under the railway subgrade will resonate due to the passing of the train, resulting in pipe rupture and corrosion and other adverse consequences. Therefore, based on the fluid structure interaction analysis method, the velocity and pressure distribution of the pipeline were analyzed by using RNG κ-ε turbulence model;the natural frequencies and vibration modes of the pipeline under the free state and the unidirectional fluid structure interaction were compared. The results show that the flow velocity in the pipeline is symmetrically distributed along the central axis of the pipeline, the water flow presents a spiral encircling trend, and the turbulence phenomenon appears at the bend of the pipeline;the natural frequency difference between free state and unidirectional fluid structure interaction is 8%~10%;the maximum deformation of pipeline in free state is 0.429 m, which is 5% higher than that under unidirectional fluid structure interaction.