排灌机械工程学报2025，Vol.43Issue(10)：990-997,8.DOI:10.3969/j.issn.1674-8530.24.0009
基于活动导叶空蚀的混流式水轮机内流场分析
Analysis of flow field inside Francis turbine based on cavitation erosion of movable guide vanes
摘要
Abstract
In order to analyze the impact of guide vanes with varying degrees of cavitation erosion on the internal flow field of a Francis turbine,based on the HLA855a-LJ-250 turbine,four models were established corresponding to the different stages of cavitation erosion development on the movable guide vanes namely:intact,dotted,honeycomb,and continuous flake cavitation pits.The unit operated un-der rated operating conditions,and steady-state calculations were performed using the Realizable k-ε turbulence model and wide-band noise model.The results indicate that as the degree of cavitation ero-sion in the guide vane increases,the value and range of turbulent kinetic energy of guide vane compo-nents gradually increase.Water flow impact and friction within cavitation pits are significant factors contributing to energy dissipation.The negative pressure of the runner in the unit with cavitation erosion is lower,making the runner more susceptible to cavitation erosion.This also leads to disordered draft tube streamlines,which significantly hinders energy recovery and utilization.The severity of cavitation erosion is inversely proportional to the recovery efficiency.The more severe the cavitation erosion,the lower the recovery efficiency.Additionally,the degree of cavitation erosion is closely related to the sound intensity of the guide vane parts.This correlation is further manifested as a positive relationship where both the value and distribution range of sound pressure level increase with cavitation severity.The research findings offer guidance and assistance for monitoring the condition of the unit.关键词
混流式水轮机/活动导叶/流致噪声/空化空蚀/声类比Key words
Francis turbine/movable guide vane/flow-induced noise/cavitation erosion/acoustic analogy分类
能源科技引用本文复制引用
于凤荣,冉启立,周明夫,潘泓江,刘宇晨,武文俊..基于活动导叶空蚀的混流式水轮机内流场分析[J].排灌机械工程学报,2025,43(10):990-997,8.基金项目
云南省揭榜挂帅项目(202204BW050001) （202204BW050001）
