叶片包角对离心泵水力性能及磨损特性的影响

基于CFD-DEM耦合方法计算离心泵内固液两相的流动及过流部件的磨损，研究不同叶片包角时叶轮的平均磨损率、液相的速度分布、颗粒的运动、颗粒与壁面的接触次数和接触力.研究表明：随着包角的增大，扬程、效率和平均磨损率均先增大后减小；当包角为110°时，颗粒与壁面的接触力和接触次数最大，导致磨损最为严重，磨损严重区域在吸力面中间与前盖板的交界处；包角从90°增大到110°时，颗粒与过流部件壁面之间的接触次数逐渐增多，接触力逐渐增大，增大了离心泵磨损程度；包角从110°增大到160°时，聚集在吸力面中间位置的低速颗粒逐渐减少，导致颗粒与过流部件壁面之间的接触次数逐渐减少，接触力逐渐减小，从而减小了磨损严重的区域，减轻了离心泵磨损程度.

Effects of blade wrap angle on hydraulic performance and erosion characteristics of centrifugal pump

Based on the CFD-DEM(computational fluid dynamics-discrete element method)coupling method, the solid-liquid two-phase flow in the centrifugal pump and the erosion of the flow parts were calculated. The average erosion rate of the impeller, the velocity distribution of the liquid phase, the movement of the particles, the number of contacts between the particles and the wall, and the contact force at different blade wrap angles were studied. The study shows that as the wrap angle increases, the head, efficiency and average erosion rate all increase first and then decrease. When the wrap angle is 110°, the contact force and the number of contacts between the particles and the wall surface are the largest, resulting in the most serious erosion. The position of severe erosion located at the junction of the middle of the suction surface and the shroud. When the wrap angle increases from 110° to 160°, the low-velocity area of the suction surface gradually decreases, resulting in a gradual decrease of low-velocity particles gathered in the middle of the suction surface, reducing the area where the suction surface is severely eroded.