水力发电学报2025，Vol.44Issue(3)：1-12,12.DOI:10.11660/slfdxb.20250301
以比能量和梯度函数为目标的混流式水轮机水力优化研究
Research on hydraulic optimization of Francis turbine with specific energy and gradient function as objectives
摘要
Abstract
The capability of Francis turbine units with wide-load stable operation is crucial for constructing a new electric power system.Currently,a great number of hydropower units suffer from poor stability under off-design conditions,which cannot meet the demand for flexible operation over a wide-load range.This paper presents a Francis turbine hydraulic optimization method for wide-load operation and its application to Unit No.5 at the Dachaoshan hydropower station in Yunnan,using specific energy and gradient function as a quantified target.And developed a new type of runner,namely"Negative Inclination and Reverse C-Type"that can effectively improve the hydraulic stability of the unit and achieve a stable wide-load range.Numerical calculations and model tests show new design reduces significantly the draft vortex and the characteristic channel vortex in comparison to the original runner at Dachaoshan,eliminating high partial load pressure pulsations.It brings about a reduction of more than 50%in the maximum pressure fluctuation amplitude in the vaneless region and draft tube,meeting the requirements for long-term continuous safe and stable operation over a wide-load range.关键词
混流式水轮机/负倾反C型转轮/宽负荷运行/数值模拟/模型试验Key words
Francis turbine/"Negative Inclination and Reverse C-Type"runner/wide-load stable operation/numerical simulation/model tests分类
能源与动力引用本文复制引用
程宦,周凌九,王正伟,罗洪,唐君怀,王钊宁,赵永智,冷在军,张骁..以比能量和梯度函数为目标的混流式水轮机水力优化研究[J].水力发电学报,2025,44(3):1-12,12.基金项目
四川省科技计划资助项目(2024ZHCG0052) （2024ZHCG0052）
