Prediction of pulp pump erosion characteristic based on solid-liquid two-phase turbulent flow
Yang Lingbo1, Xiao Yexiang2, Tang Bing1, Wang Zhengwei2
1.School of Mechanical Electronic and Information Engineering, China University of Mining and Technology, Beijing 100083, China; 2.State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing, 100084, China
Abstract：Euler-Euler and Euler-Lagrange two-phase model was applied to simulate the turbulent flow in the pulp pump and to predict the erosion characteristics considering the impact of tip clearance. Euler multiphase model use Particle model to analyze two-phase flow, the wall wear was mainly affected by the slip velocity and the fraction of volume of solid particles. Lagrange multiphase model was applied to predict the wear quantity based on Finnie erosion model. The result of pulp pump′s open impeller under different discharge conditions show that, the Euler model predict blade and front cover wear seriously under the design flow rate, case wear seriously under the small flow rate. The Lagrange model revealed the blade and front cover wear seriously, found the wear rate of blade and front cover increased and then decreased with the discharge rising, the wear rate of back cover and case decreased gradually. These two model predict the impeller and front cover are badly worn,which coincide with the actual phenomenon. Lagrange model can analyze the wear positions and degree quantitatively. This study can provide a reference for the research of pulp pump two-phase flow and erosion prediction.
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