大型高水头混流式水轮机的稳定性设计优化

Stability Design Optimization of Huge High-head Francis Turbine

大型高水头混流式水轮机的稳定性对电站的安全运行非常重要,因此通过优化设计提高水轮机的稳定性具有重要意义。本文分析研究了国内某电站的大型混流式水轮机的稳定性设计优化。首先根据电站工程特点,对国内外相近水头和规模的混流式水轮机主要参数进行了统计研究,分析了本电站水轮机设计参数特点;然后在模型试验和仿真计算的基础上,结合无叶区压力脉动的产生机理,对转轮叶片和活动导叶等关键部件进行了稳定性设计优化;最后通过优化前后的性能和流场的分析对比,表明稳定性设计优化提高了混流式水轮机运行稳定性,保障了电站长期安全可靠运行。

The stability of the huge high-head Francis turbine is very important to the operation of the power station,so it has great significance to improve the stability of this Francis turbine by design optimization.In this paper,design optimization has been researched for one high-head Francis turbine.Firstly,according to station characters,design parameters of this high-head Francis turbineare analysis with the statistical study on main parameters of similar head and scale turbine in the world. Then based onthe results of mode test,CFD and the mechanism of non-blade area pressure fluctuation,designs of run blades and guide vanes are optimized to improve stability. Finally,performance and fluid field analysis shows that the design optimization improves Francis turbine’s stability,and guarantees long-term stable operation.