固液两相流离心泵内部流场数值模拟与磨损特性  

Numerical Simulation of Solid-liquid Two-phase Turbulent Flow and Wear Characteristics of Centrifugal Pump

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

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业机械学报》2013年第11期53-60,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(51209106);江苏高校优势学科建设工程资助项目;江苏大学高级人才科研启动金资助项目(11JDG040)

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了数值模拟。对液相采用标准k-ε湍流模型,对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。分析了在颗粒体积分数为0.1,固体颗粒直径分别为0.1、0.25、0.5、0.75 mm时,过流部件壁面处固体颗粒相的滑移速度。结果表明:随着颗粒直径的增大,壁面处固体颗粒相的滑移速度增大;固体颗粒相向叶片工作面偏移;在叶片头部、叶片压力面和吸力面的中部到尾部处、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。Three-dimensional simulation was performed for the solid-liquid two-phase turbulent flow in centrifugal pumps with particle model and inhomogeneous model separately by ANSYS - CFX software. k-ε turbulence model was applied to predict the liquid-phase, and an algebraic equation known as the dispersed phase zero equation was adopted to predict the solid-phase. All wall boundaries were set as free slip wall conditions. Under the fraction volume of 0. 1, the effect of the different diameters （0.1 mm, 0.25 mm,0.5 mm and 0.75 mm） of solid particles on the slip velocity on the wall of flow-passage parts was studied. The results show that the slip velocity of solid particles increases along with the increase of the particle diameter. And solid particles gradually accumulate near the wall of press surface. There are three places where slip velocity of solid particles is larger and erosion of wall is more serious, such as the head of blade and the blade trailing edge, also the shroud part close to the back pressure side of blade.

关 键 词：离心泵 固液两相流 数值模拟 滑移速度 磨损 

分 类 号：TH311[机械工程—机械制造及自动化]