排灌机械工程学报2016，Vol.34Issue(8)：657-664,671,9.DOI:10.3969/j.issn.1674-8530.15.0238
口环间隙对诱导轮离心泵空化流动和性能的影响
Effect of wear-ring clearance on cavitation flow and performance of centrifugal pump with inducer
摘要
Abstract
In order to investigate the effect of wear-ring clearance on the cavitation performance of the centrifugal pump with the pre-positioned inducer,the cavitation flow and performance in the centrifugal pump with the pre-positioned inducer were numerical simulated with four different projects which were 0.15,0.25,0.40 and 0.60 mm based on the RNG k -εturbulent model combined with Rayleigh -Plesset Homogeneous cavitation model,and compared with experimental results.The results show that the size of the wear-ring clearance has a greater influence on the external performance and cavitation performance;with the increasing of the wear-ring clearance,compared with 0.15 mm,the total head efficiency and the head efficiency of the impeller decrease,the changes of the head are up to 0.60%and 4.21%,and the changes of the efficiency are up to 6.50% and 9.32%.Moreover,the head and efficiency of the inducer increase,and they are up to 29.86% and 28.40%.The cavitation curves wave with the increasing of the wear-ring clearance and the decreasing of the cavitation number,and the wider the clearance is,the more obvious the flactuation is.The cloudy cavitation bubbles are dis-tributed on the pressure surface that is close to the front shroud,which causes cavitation instability, and the wider the clearance is,the more the cavitaion is,the greater the critical cavitation number is. It is found that the factors that influence the cavitation instability of the pump are possibly related to the impact of leakage high-pressure fluid of the wear-ring outlet on the main flow,the occurrence of cavita-tion at the intersection of impeller inlet and wear-ring clearance outlet and the change of the outlet flow angel caused by cavitating in the pre-positioned inducer.关键词
诱导轮离心泵/口环间隙/外特性/空化性能/数值模拟Key words
centrifugal pump with inducer/wear-ring clearance/external performance/cavitation performance/numerical simulation分类
机械制造引用本文复制引用
肖丽倩,黎义斌,刘宜,毕祯,赵伟国..口环间隙对诱导轮离心泵空化流动和性能的影响[J].排灌机械工程学报,2016,34(8):657-664,671,9.基金项目
国家自然科学基金资助项目（51369015）；甘肃省科技计划项目 （）
