水力发电学报2026，Vol.45Issue(1)：11-18,8.DOI:10.11660/slfdxb.20260102
水轮机顶盖干湿模态特性及流体附加质量效应
Dry and wet modal characteristics of hydro turbine head covers and fluid added mass effects
摘要
Abstract
This paper applies acoustic-solid coupling numerical methods to a systematical analysis on the wet modal characteristics of the top cover of a HLBD993-LJ-407 pumped storage unit at varying fluid-structure conditions,revealing and quantifying the effects of its fluid-induced added mass.Results indicate the added mass reduces the cover's natural frequencies significantly,with the most pronounced attenuation observed in the 1ND mode(natural frequency reduction of 19.6%,corresponding to an added mass coefficient of approximately 0.55).The added mass effect peaks in the water layer within the upper crown gap of the runner,while it diminishes in the flow zones near the inner and outer surfaces of the guide vanes due to boundary connectivity.Meanwhile,it follows the non-linear superposition in the case of multiple fluid domains coexisting.The effect is offset partially by the counter-phase fluid motions in the upper crown gap and guide vane zones;A fully reflective boundary suppresses fluid motions more effectively than a fully absorbing one,increasing the added mass coefficient by more than 20%,and intensifying frequency reduction.This study has explored the mechanism of added mass influencing the vibration characteristics of the top cover at complicated flow conditions,laying a basis for further study of vibration suppression design and operational optimization.关键词
水轮机/顶盖/湿模态/声固耦合/流体附加质量Key words
turbine/head cover/wet modal/acoustic-solid coupling/fluid added mass分类
能源科技引用本文复制引用
徐鹏博,王世建,赵宏磊,李鹏,胡浩,马智豪,吴庆宏..水轮机顶盖干湿模态特性及流体附加质量效应[J].水力发电学报,2026,45(1):11-18,8.基金项目
国家自然科学基金(12072298 （）
12172311) （）
西南交通大学博士研究生创新基金项目资助(CX-2025ZD06) （CX-2025ZD06）
