带间隙和不带间隙低比转速离心泵空化的数值模拟  

Numerical Simulation of the Cavitation of Centrifugal Pumps with and without Clearance at a Low Specific Speed

作　　者：丛小青[1] 张悦 王玉帛 CONG Xiao-qing;ZHANG Yue;WANG Yu-bo(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu Province,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《中国农村水利水电》2020年第8期91-96,共6页China Rural Water and Hydropower

摘　　要：为研究低比转速多级泵间隙对泵空化性能的影响,应用CFX数值模拟软件,对比分析有无口环间隙模型泵在不同空化系数下的空化性能。通过设计6种间隙组合模型,分析了不同位置的间隙及其尺寸对多级泵空化性能的影响。结果表明,在降低空化系数的前提下,当空化处于早期和发展阶段时,叶轮口环间隙有利于叶轮的空化性能;当空化恶化时,叶轮口环间隙降低泵空化性能。叶轮口环间隙越大,泵空化性能越好。研究成果为进一步深入研究其他工况下空化发展情况,分析由空化引起的压力脉动、振动与噪声问题奠定了基础。In order to study the effect of multistage pump clearance on cavitation performance at low specific speed,CFX numerical simulation software is applied to analyze the cavitation performance of model pumps with and without mouth ring clearance under different cavitation coefficients.Six clearance combination models are designed to analyze the influence of the clearance at different positions and its size on the cavitation performance of multistage pump.The results show that on the premise of decreasing cavitation coefficient,when cavitation is in the early and development stages,the existence of mouth ring clearance is beneficial to the cavitation performance of the impeller.When cavitation deteriorates,the clearance between the impeller and the ring reduces its cavitation performance.The larger the clearance of impeller ring,the better the cavitation performance of pump.The research findings lay a foundation for studying further the cavitation development in other working conditions and analyzing pressure pulsation,vibration and noise caused by cavitation.

关 键 词：多级离心泵 空化特性 数值模拟 空化系数 间隙 

分 类 号：TV136.2[水利工程—水力学及河流动力学] TH311[机械工程—机械制造及自动化]