出口角对离心泵内固液两相流动影响

采用欧拉多相流模型、标准k-ε湍流模型与SIMPLEC算法,应用计算流体力学软件Fluent,对3台不同叶片出口安放角的离心泵内的固液两相湍流进行了数值模拟,分析了叶片出口安放角对泵内部固液两相流场的影响.计算结果表明：在叶轮流道内,固体颗粒的相对运动方向比液相更偏向叶片压力面,大叶片出口角叶轮内两相速度的夹角较大.通过对比不同叶轮内压力分布及固体颗粒体积浓度分布,得出以下结论：大出口安放角的叶轮压力面附近聚集了更多的颗粒,导致大量颗粒与叶片尾部的压力面相撞;叶片出口安放角增大使得叶轮出口压力增大.

Effects of impeller outlet angle on solid-liquid two phase flow in centrifugal pump

Abstract： To study the solid-liquid two-phase flow mechanism in centrifugal pump with impeller outlet angles, three-dimensional simulation was performed for the solid-liquid two-phase turbulent flow in this kind pump by using Fluent software with Eulerian model, SIMPLEC algorithm and standard k-ε turbulence model. The effects of impeller outlet angle on the solid-liquid two phase flow in the centrifugal pump were fully analyzed. The result shows that the direction of relative motion of particles is towards the pressure side of the impeller, the velocity difference between two phases is more obvious in the impeller with large outlet angle. And more particles accumulate near the pressure side of the impeller with large outlet angle, which results in large particles impact on the tail of the blade. The outlet pressure is increased as the outlet angle becomes larger.