排灌机械工程学报2017，Vol.35Issue(1)：13-17,5.DOI:10.3969/j.issn.1674-8530.15.0240
叶轮口环间隙对离心泵性能及流动特性的影响
Effect of wear-ring clearance on performance and flow characteristics of centrifugal pump
摘要
Abstract
In order to explore the influence of different wear-ring sizes on the performance and flow characteristic,both numerical simulation and performance test are conducted in a centrifugal model pump.Two normal wear-ring clearances (0.25 mm and 0.50 mm)and an abnormal big gap (0.75 mm)are selected.By comparing the pump performance and flow characteristics at every clearance,the influence of wear-ring size on the performance and flow is obtained.It is shown that with increasing clearance both the pump head and the efficiency decrease.The radial thrust on the impeller reaches the largest at 0.50 mm gap,decreases at 0.25 mm,and eventually arrives at the smallest thrust at 0. 75 mm.The total pressure is distributed more evenly in the axial cross-section of the wear-ring at a lar-ger clearance.The total pressure near the side chamber decreases,but that near the impeller eye in-creases.Because of being affected by the centrifugal force on the shroud,the radial velocity magnitude and vorticity of the fluid in the chamber between the shroud and the casing increase gradually with in-creasing clearance,causing an even more smooth streamline pattern there.关键词
离心泵/口环间隙/泵外特性/流动特性Key words
centrifugal pumps/wear-ring clearance/pump performance/flow characteristics分类
农业科技引用本文复制引用
高波,王震,杨丽,杜文强,李长军..叶轮口环间隙对离心泵性能及流动特性的影响[J].排灌机械工程学报,2017,35(1):13-17,5.基金项目
国家自然科学基金资助项目（51576090）；江苏高校优势学科建设工程项目 （）
