基于Particle模型固液两相流离心泵流场数值模拟  

Numerical simulation of solid-liquid two-phase turbulent flow in centrifugal pump based on Particle model

作　　者：汪家琼[1] 蒋万明[1] 孔繁余[1] 屈晓云[1] 宿向辉[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2013年第10期846-850,878,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51209106);国家科技支撑计划项目(2013BAK06B02);江苏高校优势学科建设工程项目

摘　　要：基于Particle模型和非均相模型,运用流场分析软件ANSYS-CFX对固液两相流离心泵的内部流场进行数值模拟.液相采用标准k-ε湍流模型,壁面设置为无滑移壁面条件;固体颗粒相采用离散相零方程模型,壁面设置为自由滑移壁面条件.重点分析了过流部件壁面处固体颗粒的滑移速度、颗粒体积分数分布、滑移速度及体积分数分布与过流部件磨损的关系,将数值模拟结果与相关文献中的试验结果进行对比.结果表明:在蜗壳大包角壁面处,固体颗粒相的体积分数较大;在叶片头部靠近前盖板处、叶片压力面和吸力面的尾部处、蜗壳起始段靠近隔舌处和靠近叶片压力面尾部的前后盖板处等壁面,固体颗粒相的滑移速度较大,磨损较为严重.采用Particle模型和非均相模型能准确地模拟固液两相流泵内的流动规律.3D simulation was performed for the solid-liquid two-phase turbulent flow in centrifugal pumps using particle model and inhomogeneous model separately by ANSYS-CFX software. The k-ε turbulence model was applied to predict the liquid-phase,while an algebraic equation known as the dispersed phase zero equation was adopted to predict the solid-phase. At wall boundaries,for the solid-phase the free slip wall conditions was used for mass and momentum. The slip velocity and the fraction volume of solid particles on the wall of flow-passage parts were studied. The computational results were compared with the results of the corresponding literature. It is found that solid particles mainly accumulated near the wall of the exit of volute. There are three places where slip velocity of solid particles is relatively high and erosion of walls is more serious. Such as the head of blade near front shroud and the blade trailing edge,also the shroud part close to the back pressure side of blade. With these two models respectively,the CFD simulation can accurately simulate solid-liquid two-phase turbulent flow.

关 键 词：离心泵 固液两相流 数值模拟 滑移速度 磨损 

分 类 号：TH[机械工程]