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运用CFD-DEM耦合模拟计算离心泵内非稳态固液两相流动
引用本文:黄思,杨富翔,宿向辉.运用CFD-DEM耦合模拟计算离心泵内非稳态固液两相流动[J].科技导报(北京),2014,32(27):28-31.
作者姓名:黄思  杨富翔  宿向辉
作者单位:华南理工大学机械与汽车工程学院, 广州510640
摘    要: 对于泵内固液两相流数值模拟,一般方法是将固体颗粒相视为拟流体,采用多相流的CFD 方法进行计算,但这难以体现固体颗粒形状大小、碰撞、凝聚和分离等特性。本文以工程中常用的IS 型离心泵作为研究对象,运用DEM 离散元法结合CFD 方法,采用EDEM-Fluent 耦合,模拟计算离心泵内非稳态固液两相流动,探索泵内固体颗粒群运动规律及其对外特性的影响。计算采用的固体颗粒密度为1500 kg/m3,泵入口固相体积率为15%,粒径在1.0~3.0 mm 范围内随机变化。计算得到了固液两相泵随时间的外特性变化,包括泵扬程、泵内固体颗粒体积的变化规律;得到了泵内固体颗粒群的运动轨迹和固相体积率分布等有价值的结果。

关 键 词:CFD-DEM耦合  离心泵固液两相流  颗粒群轨迹  非稳态数值模拟  
收稿时间:2014-07-30

Unsteady Numerical Simulation for Solid-Liquid Two-Phase Flow in Centrifugal Pump by CFD-DEM Coupling
HUANG Si,YANG Fuxiang,SU Xianghui.Unsteady Numerical Simulation for Solid-Liquid Two-Phase Flow in Centrifugal Pump by CFD-DEM Coupling[J].Science & Technology Review,2014,32(27):28-31.
Authors:HUANG Si  YANG Fuxiang  SU Xianghui
Institution:School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
Abstract:In a numerical simulation of the solid-liquid two-phase flow in pumps, the conventional approach is to treat solid particles as a kind of quasi-fluid, using the CFD in the multiphase flow case, but in this way, the characteristics of the solid particles, such as the shape and size, the collision, the agglomeration and the separation, can not be reasonably represented. In this paper, the unsteady solid-liquid two-phase flow in an IS type centrifugal pump is simulated numerically, using the discrete element method (DEM) combined with the CFD method. With the coupling of the codes of the EDEM and the Fluent, the motions of the solid particles and their effects on the pump performance are investigated. In the simulation, the solid particles are 1500 kg/m3 in density, 15% in the volume rate at the pump inlet, 1.0-3.0 mm in sizes in a random distribution. Some valuable conclusions are reached, including the time-dependent head, the particle trajectories and the solid volume rate distributions in the centrifugal pump.
Keywords:CFD-DEM coupling  solid-liquid two-phase flow in centrifugal pump  trajectories of particle group  unsteady numerical simulation  
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