基于ALE流固耦合作用的管道车静止于不同流量管流时壁面应力的分布

Wall Stresses in Cylinder of Stationary Piped Carriage with Different Flow Rate Using ALE-based Fluid-structure Interaction Models

采用数值模拟和试验验证相结合的方法对管道车静止于管道水流时管道内部流体域与管道车固体域之间的流固耦合作用对管道车壁面应力的特性进行了研究。结果表明:管道车料筒壁面剪切应力的方向与沿管道水流的方向一致,且最大值出现在料筒中后段的两组支脚之间;在该试验的四种流量工况下,管道车料筒壁面主应力的周向分量σc的最大值为35653,主应力的轴向分量σa的最大值为33144,主应力的径向分量σr的最大值为32470,即σc>σa>σr,且从管道车的后端到前端依次为先增大后减小再增大再减小的“M”型分布。管流的流量越大,单位管流流量对管道车壁面切应力和主应力的影响也越大;同时管流流量的增加对管道车料筒主应力的周向分量影响最大,轴向次之,对料筒壁面切应力的影响最小。

In this article,numerical simulation and experimental verification were combined to study the fluid-solid interaction between the fluid field inside the pipe and the solid field of the piped carriage when the piped carriage was stationary in pipe flow.The characteristics of stress on the wall of the piped carriage were studied.The results show that the direction of the shear stress on the cylinder wall of piped carriage was consistent with that of the pipe flow.The maximum value occurred between the two support feet in the middle and rear sections of the cylinder.Under the four flow conditions of the experiment,the maximum value of circumferential principal-stress component on the cylinder wall of piped carriage was 35653,that of axial principal-stress component was 33144,and that of radial principal-stress component was 32470,that is,σa>σc>σr.And the“M”distribution increased first,then decreased,then increased and then decreased from the rear-end to the front-end of the cylinder.The influence of unit flow rate on wall stress increased with the increase of flow rate.Moreover,the increase of flow rate had the greatest influence on the circumferential component of the principal stress of the cylinder,followed by the axis component,and the smallest influence on the wall shear stress of the cylinder.