固液两相流离心泵内颗粒运动规律的数值研究

Numerical simulation of solid phase movement and distribution in the solid-liquid two-phase flow centrifugal pump

针对分析固相参数对颗粒在流道内运动规律影响的问题,对不同固相参数工况下流道内颗粒运动轨迹、固相速度分布和颗粒雷诺数分布规律进行了研究,对颗粒直径以及颗粒浓度对颗粒运动规律影响进行了归纳。应用RNG k-ε湍流模型以及离散相模型进行了离心泵内部固液两相流场数值模拟。研究结果表明,颗粒与蜗壳碰撞的次数随着直径和颗粒浓度的增大而减少;叶轮流道内,颗粒与叶片发生碰撞的位置在叶片工作面;流道内的固相速度随着直径的增大整体会有减小的趋势;蜗壳和叶轮流道内两相分离严重,两相滑移速度较大。

Aiming at analyzing the problems of the influence of solid phase parameters on the motion of particles in the flow components, the panicle trajectory, solid phase velocity distribution and the panicle Reynolds number distribution of different flow components were investigated. The effect of the particle diameter and particle concentration on particle movement rule was summed up. The RNG k-epsilon turbulence model and the discrete phase model were used to simulate the turbulent flow field in a solid-liquid two-phase centrifugal pump. The results indicate that the number of particles collide with the volute is reduced with the increasing of diameter and particle concentration. In the im- peller flow passage, particles collide with blade on the working face. The solid phase velocity in the whole flow passage has a tendency to de- crease with the diameter increases. The liquid phase and solid phase are separated seriously in the volute and impeller flow passage so the two-phase slid veloeitv is the larger there.