低比转速复合离心叶轮三维湍流场数值模拟及试验  

Numerical Simulation and Test Study of Flow in Low-Specific-Speed Complex Centrifugal Impeller

作　　者：李昳[1] 何伟强[1] 陈巧红[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2009年第5期716-720,共5页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(50609025);浙江省科技厅计划项目(2008C21023)

摘　　要：为研究复合离心叶轮在改善小流量不稳定性方面的工作机理,采用考虑旋转和曲率影响的k-ε湍流模型对4叶片普通离心叶轮流道和24叶片的长中短叶片复合离心叶轮流道的内部湍流进行数值模拟,并与外特性试验结果作分析比较。结果表明:长中短叶片复合离心叶轮可以较好地消除射流-尾迹结构,改善低比转速离心泵小流量工作的不稳定情况;在全流量范围内,复合叶轮低比转速离心泵的效率和扬程都高于普通叶轮低比转速离心泵。文章提出的数值方法能较好地模拟复合离心叶轮内部湍流场的流动情况。In order to research the working mechanism of complex centrifugal impeller that has differ ent length of blades in improving the instability at small flow, the modified k-εturbulence model that considers rotation and curvature is applied to simulate the three dimensional turbulent flow fields in the common impellers with four blades and the complex impellers with twenty-four blades. The conclusion of simulation is compared with that of the experiment. It is achieved that the complex impellers can eliminate the jet-wake structure and improve the instability of low-specific-speed centrifugal pump at small flow. In whole flux range, the efficiency and head of the centrifugal pump with complex impellers is higher than that of common impellers. The method of numerical simulation can preferably simulate the inner turbulent flow field of the complex centrifugal impellers.

关 键 词：离心泵 低比转速 复合叶轮 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]