水力发电学报2012，Vol.31Issue(5)：278-285,291,9.
泄水锥形式对混流式水轮机压力脉动的影响分析
Analysis of pressure oscillation characteristics in Francis hydraulic turbine with different runner cones
摘要
Abstract
Three-dimensional unsteady turbulent flow in the full flow passage of a model Francis hydraulic turbine was numerically simulated with a transition SST turbulence model. This model was verified using experimental data. Pressure oscillations in this turbine in five operation conditions were analyzed for four runner cone schemes, original cone design, extended cone, extended cone with grooves, round-top cone. Results show that in all the three improved schemes, vortex rope in the draft tube takes distribution patterns different from original design, and its frequency band of pressure oscillation is narrower. As guide vane opening varies, the influence of cone shape on hydraulic efficiency and pressure oscillations is different. Round-top cone is the best in terms of peak-to-peak amplitude. The improved schemes are effective in reducing low-frequency pressure oscillations induced by this vortex rope, while little effective in reducing blade-frequency pressure oscillation caused by rotor-stator interaction.关键词
混流式水轮机/压力脉动/泄水锥/数值模拟Key words
Francis hydraulic turbine/pressure oscillations/runner cone/numerical simulation分类
建筑与水利引用本文复制引用
钱忠东,李万..泄水锥形式对混流式水轮机压力脉动的影响分析[J].水力发电学报,2012,31(5):278-285,291,9.基金项目
国家自然科学基金资助项目 （）
中央高校基本科研业务费专项资金资助 （）
