水力发电学报2026，Vol.45Issue(5)：44-54,11.DOI:10.11660/slfdxb.20260504
水泵水轮机转轮模态节径分量及流激振动特性分析
Analysis of diametrical components of pump-turbine runner modes and flow-induced vibration
摘要
Abstract
Flow-induced vibration of a pump-turbine runner is a major challenge in practical operation,and modal analysis is key to understanding its characteristics.This study uses an acoustic-structure coupling method to determine the natural modes of a prototype pump-turbine runner in the flow passage.The nodal diametrical numbers in each mode are identified through Fourier series expansion of the distribution of the runner outer rim displacement along its circular path.Based on the rotor-stator interaction(RSI)theory,the harmonic responses of the runner under specific excitations are calculated using an acoustic-structure coupling model,and its frequency avoidance range is then examined.The results show each runner mode contains multiple diametrical components.For a 9-blade runner,its natural mode numbers always couple with those associated components taking values with a difference of±9.It is noteworthy that an excitation force that matches the derived diametrical number can effectively excite the natural mode dominated by the original one.In addition,under specific excitations,certain higher-order modes exhibit strong resonance with amplitudes comparable to those of lower-order modes.These findings indicate the real excitation characteristics of pump-turbine runners are more complicated than commonly assumed,posing greater challenges in vibration avoidance.关键词
水泵水轮机转轮/固有模态/节径分量/流激振动/动静干涉Key words
pump-turbine runner/natural mode/diametrical component/flow-induced vibration/rotor-stator interaction分类
能源科技引用本文复制引用
夏翔,靳发业,韩文福,孟龙,邓磊..水泵水轮机转轮模态节径分量及流激振动特性分析[J].水力发电学报,2026,45(5):44-54,11.基金项目
国网电力工程研究院有限公司自有基金研究开发项目(52500126000C) （52500126000C）
