水利学报2026，Vol.57Issue(8)：1283-1294,12.DOI:10.3724/j.slxb.20260050
水泵水轮机反水泵工况下活动导叶压力脉动分析
Analysis of pressure fluctuation in guide vanes of a pump turbine under reverse pump conditions
摘要
Abstract
As the largest form of energy storage,pumped storage power station units are prone to entering the S-characteristic region during startup under turbine operating conditions,leading to increased vibrations and failure to synchronize to the grid.This study takes a model pump turbine as the research subject and employs the dynamic mode decomposition method to analyze the unsteady characteristics of the flow field under reverse pump conditions.The dis-tribution of flow field eigenvalues and the relationship between modal energy and frequency across different modes are clarified.The results show that the counterclockwise high-speed water rings formed in the vaneless space,along with periodically evolving vortex structures in the guide vane passages such as separation vortices and horseshoe vortices,collectively cause low-energy flow passages to propagate circumferentially at 0.2 times the rotational frequency,resulting in significant uneven energy distribution.The pressure fluctuations in the vaneless space are dominated by the rotor-stator interaction frequency of 9fn,which exhibits high amplitude and uniform circumferential distribution.Within the guide vane flow passages,the dominant frequencies shift to low-frequency fluctuation at 1.2fn induced by the periodic evolution of secondary separation vortices with amplitude exhibiting a non-uniform and alternating cir-cumferential distribution.Dynamic mode decomposition further confirms the periodic and stable nature of the flow field.The dominant modes accurately correspond to the basic steady-state structure,rotor-stator interaction,and internal flow instability characteristics.The periodic evolution of vortex structures within the guide vanes is identified as the root cause of low-frequency pressure fluctuations and uneven energy distribution across the flow passages.关键词
水泵水轮机/动态模态分解/压力脉动/S特性/反水泵工况Key words
pump turbine/dynamic mode decomposition/pressure fluctuation/S-shaped characteristic/reverse pump condition分类
建筑与水利引用本文复制引用
王李科,米建中,卢金玲,冯建军,朱国俊,张雪..水泵水轮机反水泵工况下活动导叶压力脉动分析[J].水利学报,2026,57(8):1283-1294,12.基金项目
国家自然科学基金项目(52439006,52309118,52579091) （52439006,52309118,52579091）
水资源工程与调度全国重点实验室开放基金项目(2025SDG04) （2025SDG04）
