排灌机械工程学报2016，Vol.34Issue(5)：375-380,6.DOI:10.3969/j.issn.1674-8530.14.1017
低比转数离心泵内部流动特性和外特性试验
Internal flow characteristics and performance test of low specific-speed centrifugal pumps
摘要
Abstract
To investigate into the influence of blade length on internal flow and performance of a low specific-speed centrifugal pump,an impeller with 8 full-length blades is designed by updating a refe-rence impeller which has 4 full-length blades plus 4 splitters.The flow field in the pumps is calculated based on the time-averaged Navier -Stokes equation and the Spalart -Allmaras turbulence model, then the internal flow characteristics are obtained.At the same time,the pump performance is tested to validate the predicted performance.It is found that the circumferential velocity is greater than the ra-dial velocity in the volute,and the latter increases slowly with the increasing circumferential angle.At the design point,both the head and the efficiency of the impeller with 8 full-length blades are higher than those of the impeller with 4 full-length blades plus 4 splitters.The numerical results show that the low pressure area at the inlet of the impeller with 8 full-length blades is larger than that of the impeller with splitters.There exist vortexes in the flow passages of both impellers,and the area covered by the vortexes in the impeller with 8 full-length blades is larger than that in the impeller with splitters.Ex-perimental results have verified the correctness of the numerical simulations.关键词
离心泵/分流叶片/数值模拟/外特性试验Key words
centrifugal pump/splitter blade/numerical simulation/external characteristics分类
农业科技引用本文复制引用
崔宝玲,方晨,葛明亚..低比转数离心泵内部流动特性和外特性试验[J].排灌机械工程学报,2016,34(5):375-380,6.基金项目
国家自然科学基金资助项目(51536008) （51536008）
