动静叶栅内固液两相过渡过程的数值研究  

Numerical analysis of transition process of solid-liquid two-phase in rotor-stator cascades

作　　者：韩伟[1] 岳婷[1] 李仁年[1] 金毅[1] 蒋雷[1] 胡鹏林[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《排灌机械工程学报》2015年第2期111-115,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学青年基金资助项目(51209113)

摘　　要：为了研究过渡过程动静叶栅内固液两相流的瞬态流动特性,以导叶式离心泵为研究对象,进行几何建模及结构化网格划分,借助Fluent软件,基于Mixture多相流模型、分离涡湍流模型及用户自定义函数,对其全流道进行三维瞬态数值模拟计算.对过渡过程动静叶栅内瞬态流动进行分析,结果表明:过渡过程中,位于动叶进口背面的低压区范围扩大,位于动叶工作面靠近轮缘处的高压区范围缩小;随着时间增加,动叶栅流道内的涡持续产生、合并,并在静叶栅内破碎、耗散,且流量增大,使得动叶进口处的流动滞止,导致动叶进口逐渐产生旋涡;流量未增大到设计流量之前,固相容易沉积在静叶栅出口;在流量瞬态增加到设计流量时,动叶栅子午面中间流线上的固相体积分数总体变小且趋于均匀分布.In order to study the transient flow characteristics of the solid- liquid two-phase flow in rotor- stator cascades,a centrifugal pump with radial diffusers was chosen as the object of study and its model was established. The structured grid was finished and the three dimensional flow field was simulated based on the mixture multiphase model,the detached eddy simulation model and the user defined function. The internal transient flow was analyzed. The results obtained show that the area of minimum pressure located at the inlet of blade suction side becomes wide during the transition process. Simultaneously,the area of the highest pressure at the blade pressure side and near the impeller tip becomes shrinking. The vortexes in the channel of the rotor cascades evolves constantly and vortexes are formed gradually at the inlet of the rotor blade because of the turbulence intensity as the flow rate becomes larger. The solid- phase deposits at the outlet of the stator cascades easily at small flow rates. With the flow rate increases,the global volume fraction of solid- phase decreases and its distribution becomes homogeneous on the meridian middle streamline of the rotor cascades.

关 键 词：动静叶栅 固液两相流 过渡过程 分离涡模型 

分 类 号：S277.9[农业科学—农业水土工程]