口环间隙泄漏对离心泵空化性能的影响分析  

Influence of wear-ring clearance on cavitation characteristics of centrifugal pumps

作　　者：高鹏[1] 韩汝军[1] 乔羽[1] 曹瑞峰 聂志峰[1] GAO Peng;HAN Rujun;QIAO Yu;CAO Ruifeng;NIE Zhifeng(College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, Chin)

机构地区：[1]山东科技大学机电学院,山东青岛266590

出　　处：《人民长江》2018年第9期76-80,90,共6页Yangtze River

基　　金：山东省高等学校科技计划项目(J11LD21);青岛市科技计划基础研究项目(12-1-4-6-(2)-jch)

摘　　要：以DG-350型多级离心泵次级叶轮为研究对象,研究了口环间隙对离心泵空化性能产生的影响。通过定常数值模拟,计算出了离心泵的扬程和效率,同时得出了口环与进口段交汇处的速度矢量图、涡量云图和空化区域分布图以及叶轮流道内的空化区域分布图。模拟结果与实验结果的对比分析表明:(1)误差都在实际工程所要求的5%左右,说明计算与模拟结果准确;(2)由于口环与进口段交汇处速度旋涡的存在,使得离心泵的进口段与前口环交汇处区域的压力降低,从而导致了空化现象的发生;(3)随着口环间隙的增大叶轮流道上的空化区域也随之增大,从而减小了流体的过流面积,使流体速度和必须的汽蚀余量增大,NPSHR增大,则叶轮进口处的空化区域也就会增大。Taking the secondary impeller of DG - 350 multistage centrifugal pump as a test model, the influence of wear - ring clearance on the cavitation performanee of the centrifugal pump calculated by steady numerical simulation. The velocity vector, was studied. The head and efl＇ieieney of centrifugal pump were vortieity distribution and cavitation area distribution at the intersection of wear - ring and inlet as well as the cavitation distribution in the impeller channel were obtained. Compared with the simulation results and experimental results, the errors were all about 5% of the engineering requirements, the ealeulation and simulation results were aeeurate. Due to the existenee of veloeity vortiees at the interseetion of the wear - ring and the inlet seetion, the pressure at the interseetion of the inlet seetion of the eentrifugal pump and the front wear - ring elearanee deereased, re- sulting in eavitation. With the inerease of wear - ring elearanee, the eavitation area on the impeller ehannel also inereases. Thus, the flowing area reduees, the fluid veloeity and NPSHR inerease, and then the eavitation area at the inlet seetion of the impeller inerease.

关 键 词：离心泵 口环间隙 空化特性 扬程 效率 

分 类 号：TV734[水利工程—水利水电工程]