排灌机械工程学报2017，Vol.35Issue(9)：749-754,6.DOI:10.3969/j.issn.1674-8530.16.0074
蜗壳面积变化规律对低比转数离心泵性能的影响
Influences of volute cross-section area profile on performance of low-specific-speed centrifugal pump
摘要
Abstract
In order to investigate effects of volute cross-section area profile on performance and pressure pulsation of centrifugal pump,a single stage centrifugal pump with a volute respectively in four different cross-section area profiles (convex up,linear,concave down and S-shaped) is involved in the present study.Unsteady turbulent flow field in the pump is simulated and analyzed.The results show that the area profile has a slight influence on the hydraulic performance at design point,the pump head and efficiency are changed by less than 1.4％ and 0.4％,respectively,in comparison with the reference case-linear profile.However,at off-design points,the head and efficiency change considerably from one profile to another.Further,velocity distribution in the cross-section largely depends on cross-section area profile.The velocity field in the volute with linear,concave down and S-shaped areaprofiles is more uniform than that in the volute with convex up area profile.At design point,the volutewith convex up and S-shaped area profiles can reduce pressure pulsation level obviously,in particular,the volute with S-shaped area profile results in the lowest pulsation level and is the best configuration.Furthermore,the volute with concave down area profile can intensify pressure pulsation amplitude.Thestatic pressure around the impeller can be altered by volute cross-section area profile,as a result,themagnitude of radial thrust is changed.The average radial thrust on the impeller is the minimum for thelinear area profile,and it is the maximum for the convex up area profile.The results can be significantfor configuration optimization of volute in a centrifugal pump.关键词
离心泵/蜗壳/面积变化规律/压力脉动/径向力Key words
centrifugal pump/volute/area progression/pressure pulsation/radial thrust分类
农业科技引用本文复制引用
高波,杜文强,杨丽,张宁,王浩宇,袁霄..蜗壳面积变化规律对低比转数离心泵性能的影响[J].排灌机械工程学报,2017,35(9):749-754,6.基金项目
国家自然科学基金资助项目(51576090) （51576090）
江苏高校优势学科建设工程项目 （）
