液下泵内三维湍流流动的数值模拟

Numerical Simulaton of 3D Turbulent Flow in Underwater Pump

为研究泵内三维湍流场,以FY型液下泵为研究对象,基于Reynolds时均化的N-S方程和标准的κ-ε两方程湍流模型,采用多重参考坐标系法,对单级液下泵包括进水室、叶轮及压水室的三维湍流场进行了耦合计算。得到液下泵叶轮内静压、相对速度沿叶片表面的变化规律以及压水室内静压、速度分布。计算结果表明,叶轮各叶片间流道内相对速度沿叶片工作面先减小后增大,沿叶片背面先增大后减小:叶轮内流速及压力等分布不对称:隔舌附近静压分布存在较大梯度;压水室出口段处速度分布不均匀以及压水室内的流体以涡旋的形式向出口推进。此数值计算结果对液下泵的水力设计或改型优化设计等研究具有指导意义。

In order to study the 3D turbulent flow in pump, the multiple reference frame was set between impeller and volute casing to compute the coupling question of FY underwater pump based on the Reynolds-averaging N-S equations and the standard two equations k-ε turbulent model, From the computed information of flow field, the velocity and static pressure distributions in underwater pump were obtained. The computation results indicate the following results： Relative velocity increases first and then decreases along pressure side of blade, and the opposite rule occurs along suction side; The velocity and pressure distributions are dissymmetry in impeller; The pressure gradient changes highly near the volute tongue; The velocity is dissymmetry at the segment of volute outlet and fluid in volute casing flows as the type of vertex. The results of the numerical computation could be referred for further researches.