Effects of impeller trimming on energy performance and fluid-structure interaction characteristics of the two-stage pump

作     者：Xu, Zhengxuan Zhang, Fan Zhu, Lufeng Chen, Ke Zhang, Jinfeng Hong, Qiuhong 

作者机构：Jiangsu Univ Natl Res Ctr Pumps Zhenjiang 212013 Jiangsu Peoples R China Changzhou Inst Technol Sch Aerosp & Mech Engn Flight Coll Changzhou 213032 Jiangsu Peoples R China Kunming Jiahe Sci & Technol Co Ltd Kunming 650000 Peoples R China 

出 版 物：《ENERGY》 (Energy)

年 卷 期：2025年第317卷

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：National Natural Science Foundation of China Yunnan Provincial Ranking the Top of the List for Science and Technology Projects of China [202204BW050001] 

主　　题：Two-stage pump Impeller trimming Performance Fluid-structure interaction 

摘      要：In this paper, the effects of impeller trimming on the performance and fluid-structure interaction characteristics of the two-stage pump are studied by numerical simulation and experimental verification. The existing impeller trimming formulas are primarily applicable to single-stage pumps. Applying these formulas to the current two- stage pump reveals that while they provide a reasonable approximation, discrepancies exist, indicating a need for greater precision. Therefore, the head trimming formula is preliminarily revised for this kind of pump. Meanwhile, according to the experimental data, a preliminary deduction indicates that the ratio between the ratio of change of each trim and the ratio of change of head is about 1.1. The variation of impeller dynamic characteristics under different trimming quantities is also studied. It was found that the prototype pump experienced the greatest pressure at 0.4Q. As the impeller is trimmed, the influence of the flow change on the pressure change in the impeller becomes smaller. The changing trend of equivalent stress with flow rate gradually flattened. Therefore, reasonable trimming of the impeller can optimize the stress of the impeller, reduce the fluid impact on the impeller when the pump is under variable flow conditions.