水力发电2025，Vol.51Issue(12)：50-54,100,6.
巨型混流式水轮机增负荷瞬变过程高保真数值模拟
High Fidelity Numerical Simulation of the Transient Process of Load Increase in a Giant Francis Turbine
摘要
Abstract
To address the issue of frequent load adjustment caused by deep peak regulation of hydropower unit,a full-flow passage numerical simulation on the transient load increase process of a giant Francis turbine at 50%to 55.6%of rated power is carried out based on three-dimensional coupled method,and the evolution of vortex structures and pressure pulsation characteristics are analyzed.The results indicate that,under the steady-state conditions at 50%and 55.6%rated power,the draft tube flow is primarily dominated by near-wall attached vortices,and within the first second of initiating load increase,the strength of attached vortices rapidly decays,and a large-scale vortex rope forms in the central region.The runner radial force is subjected to multi-source coupled excitations,including the vortex rope,rotor-stator interaction,and water hammer effects,leading to a broadband energy distribution during load increase.The axial force experiences strong transient impacts at the moment of guide vane actuation due to abrupt flow changes,resulting in severe fluctuations in runner loading.Monitoring points placed in the draft tube reveal that the inlet near-wall region is dominated by high-frequency rotor-stator interaction with relatively minor transient water hammer amplitude,and the downstream wall points are governed by vortex ropes in the draft tube,with dominant frequencies around 0.2fn.At the midsection of the draft tube,the amplitude of rotor-stator interaction frequency attenuates to zero,with evident pressure surges caused by water hammer and strong influence from the vortex ropes.关键词
混流式水轮机/增负荷/尾水涡带/压力脉动Key words
Francis turbine/load increase process/vortex rope in draft tube/pressure pulsation分类
建筑与水利引用本文复制引用
耿清华,廖祥波,陶吉全,邓玮琪,陈岳嘉,王文全..巨型混流式水轮机增负荷瞬变过程高保真数值模拟[J].水力发电,2025,51(12):50-54,100,6.基金项目
国家自然科学基金资助项目(52179087) （52179087）
中国长江电力股份有限公司资助项目(Z522302016) （Z522302016）
