基于DPM模型的离心泵非定常固液两相流及磨损计算

摘要

运用离散相模型（ DPM）结合半经验的磨损模型，模拟计算离心泵内非定常固液两相流动，探索固相颗粒运动以及对泵材料磨损的规律。计算中将液相视为连续介质，求解欧拉坐标系下的流体控制方程；把固体颗粒相视为离散介质，在拉格朗日坐标系下求解颗粒运动方程，采用迭代计算方法实现固液两相耦合。选取常用的IS型离心泵作为研究对象，清水作为连续相，石英沙粒作为离散相，粒径为0.05-0.2 mm，泵进口颗粒体积率为0.5%-3%。计算得到了离心泵内固液两相流场特性，得到了泵内固体颗粒群的运动轨迹和材料磨损率分布等有价值的结果。%In this paper,the discrete phase model( DPM)and semi-empirical wear model were used to simulate the unsteady solid-liquid two-phase flows and wear in a centrifugal pump,to explore the solid particle movement and the wear of the pump. The liquid phase was solved by the fluid governing equations in the Euler coordinate system;the solid particle phase was treated as a discrete medium and solved by the equations of particle motion in Lagrange coordinate. The solid-liquid phase coupling was performed using iterative numerical method. An IS type centrifugal pump was selected in the simulation. Water and sand particle were chosen as the continuous phase and the discrete phase,respectively. The particle volumetric ratio at the pump inlet was in the range of 0. 5%-3%with the particle size of 0. 05-0. 2 mm. The flow characteristics of the solid-liquid two-phase flows,the trajectory of the particle cluster and the distribution of wear rate in the centrifugal pump were obtained by the simulation.