• CN:11-2187/TH
  • ISSN:0577-6686

›› 2012, Vol. 48 ›› Issue (14): 169-176.

• 论文 • 上一篇    下一篇



  1. 浙江大学流体动力与机电系统国家重点实验室;浙江理工大学浙江省流体传输技术研究重点实验室
  • 发布日期:2012-07-20

Computational Analysis of Hydraulic Transmission Performance in Two-phase Flow Centrifugal Pump

ZHANG Yuliang;LI Yi;CUI Baoling;ZHU Zuchao   

  1. The State Key Lab of Fluid Power Transmission and Control, Zhejiang University The Province Key Lab of Fluid Transmission Technology, Zhejiang Sci-Tech University
  • Published:2012-07-20

摘要: 为探索一台固液两相流离心泵的水力性能与磨损特性,基于代数滑移混合物模型(Algebraic slip mixture model, ASMM)对其内部流场进行三维不可压缩定常流动数值计算,其中转子与定子之间的动静耦合采用“冻结转子法”实现。多相位定常流动计算结果与水力试验结果的对比确定最佳的转动位置,并确认数值计算方法的准确性。预测结果表明,颗粒属性对模型泵水力性能影响的次序为固相体积分数、颗粒密度和粒径。随着颗粒直径、密度和固相体积分数的增加,预测扬程均下降;效率总体上也呈现下降趋势,但在固相体积分数为10%时输送效率最高。在靠近隔舌的叶轮出口处存在由低、中、高三种速度组合的双剪切层射流—尾流结构。总体而言,模型泵叶片吸力面的磨损程度比压力面更为严重。固相体积分数对叶片表面磨损程度的影响比较明显,颗粒密度影响较小,颗粒直径仅对吸力面磨损程度影响显著,对压力面影响不明显。

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