关键词: 固液流, 颗粒属性, 离心泵, 磨损预测, 水力性能

Abstract: To explore the hydraulic performance and abrasion characteristic of a solid-liquid two-phase flow centrifugal pump, the three-dimensional incompressible two-phase flow are numerically calculated based on algebraic slip mixture model (ASMM) under steady condition, wherein the interaction between impeller and casing is accomplished by frozen rotor method. An optimal relative position between impeller and volute is identified by means of a comparison of head between the estimate and the experimental observation, meanwhile the accuracy of numerical methods applied is clarified. The predicted results indicate that the particle property affects the hydraulic performance from severe to slight in the following order, namely particle volume fraction, density and diameter. With increasing particle diameter, volume fraction and density, the predicted heads are decreased, the total efficiency is generally decreased as well, but it reaches a maximum when the particle volume fraction is 10%. A double-shear sheet jet-wake flow structure, in which the blade-to-blade relative velocity profile is with two peaks, presents at the impeller exit near the volute tongue. In general, the suction sides of blades are subject to much more severe abrasion than the pressure sides. The particle volume fraction has a remarked effect on abrasion of blades, but the density effect is slight. Moreover, the particle diameter seems to affect on abrasion on the blade suction sides rather than on the pressure sides.

Key words: Abrasion prediction, Centrifugal pump, Hydraulic performance, Particle property, Solid-liquid flow