排灌机械工程学报2025，Vol.43Issue(3)：247-253,7.DOI:10.3969/j.issn.1674-8530.24.0024
两级轴流泵系统水力特性
Hydraulic characteristics of two-stage axial-flow pump system
摘要
Abstract
To study the hydraulic characteristics of a two-stage axial-flow pump with double impellers and double guide vanes,a two-stage axial-flow pump system was formed by connecting the ordinary axial-flow pump impellers and the full-flow-through pump impeller in series.The CFD numerical simu-lation method was adopted to investigate the hydraulic characteristic of the device under the design con-dition and the overload conditions.The research results indicate that the two-stage axial-flow pumps have a wide operating range while maintaining good hydraulic performance,with a maximum efficiency reaching 79.95％.Under design conditions,the flow patterns of the two-stage impellers are both good.Under the overload conditions,the hub side is prone to flow separation,resulting in greater flow losses.The hydraulic loss of the second-stage guide vanes is higher than that of the first-stage guide vanes.With the increase of the rotational speed,the flow separation on the guide vanes gradually increases,and the turbulent kinetic energy also increases.The affected range gradually spreads from the guide vanes to the entire flow passage components.The cavitation performance of the two-stage pump is main-ly affected by the first-stage impeller.When the effective cavitation margin reaches NPSHA=5.86 m,the cavitation area on the blade increases significantly.When the cavitation area reaches 20％of the blade area,the efficiency begins to drop sharply.The research results can provide some theoretical references for the optimization design and hydraulic performance analysis of the two-stage axial-flow pumps.关键词
两级轴流泵/水力性能/空化性能/超负荷工况/数值模拟Key words
two-stage axial-flow pump/hydraulic performance/cavitation performance/overload conditions/numerical simulation分类
农业工程引用本文复制引用
关子龙,汤方平,王林,陈迪,郭华毅,王焕,李奉育..两级轴流泵系统水力特性[J].排灌机械工程学报,2025,43(3):247-253,7.基金项目
国家自然科学基金资助项目(51809081) （51809081）
江苏省高校优势学科建设工程项目 （）
扬州大学优秀博士学位论文基金资助项目 （）
