人民珠江2025，Vol.46Issue(9)：21-31,11.DOI:10.3969/j.issn.1001-9235.2025.09.003
基于重叠网格的大型离心泵启停工况暂态流场分析
Analysis of Transient Flow Field in Startup and Shutdown of Large Centrifugal Pump Based on Overlapping Grids
摘要
Abstract
In order to study the transient flow field characteristics of large centrifugal pumps with adjustable guide vanes during startup and shutdown,this paper numerically simulated the transient flow field of the pump under startup and shutdown conditions based on the overlapping grid method and using the SST k-ω model.The results show that during the startup and shutdown of the pump,there are a large number of vortices in the guide vane area when the adjustable guide vane opening is small,at which time the hydraulic loss is large,and the pressure difference before and after the adjustable guide vane is great.During the startup process,as the guide vane opening increases,the vortex bands at the outlet of the suction chamber and the inlet of the runner gradually disappear,and the hydraulic loss in the guide vane area decreases;the pressure after the adjustable guide vane increases,and the flow state in the adjustable guide vane area stabilizes earlier than that in the fixed guide vane area.During the shutdown process,as the adjustable guide vane closes,the flow state in the fixed guide vane area becomes disordered earlier than that in the adjustable guide vane area.When the guide vane opening is small,a large number of vortices appear in the guide vane area,at which time the hydraulic loss is large,and the pressure after the adjustable guide vane decreases;vortices begin to appear at the outlet of the suction chamber and the inlet of the runner.During the startup and shutdown,the pressure at the inlet of the runner is relatively low,and the pressure gradually increases along the flow direction from the inlet to the outlet of the runner.During the startup process,when the guide vane opening is less than 14°,the flow state in the guide vane area is disordered,and the head of the unit fluctuates sharply.Due to the lag effect of the water flow,during the shutdown process,the flow state in the guide vane area becomes disordered,and the head of the unit begins to fluctuate sharply only after the guide vane opening is less than 12°.关键词
离心泵/暂态流场/流动特性/重叠网格/数值模拟Key words
centrifugal pump/transient flow field/flow characteristic/overlapping grid/numerical simulation分类
建筑与水利引用本文复制引用
杨文其,王利英,张佳乐,孙茂祥,樊红刚,党博涛..基于重叠网格的大型离心泵启停工况暂态流场分析[J].人民珠江,2025,46(9):21-31,11.基金项目
国家自然科学基金项目(11972144、12072098、51879140) （11972144、12072098、51879140）
