水力发电学报2025，Vol.44Issue(7)：121-130,10.DOI:10.11660/slfdxb.20250710
考虑转轮间隙流的水泵水轮机S区流态演化研究
Study on flow evolution in S zone of pump-turbine considering runner tip-gap flow
摘要
Abstract
The S-shaped characteristics of high-parameter pump-turbines are the main factor of its stable operation,and the fundamental way to deal with the S-region lie in hydraulic design.For an ultra-high head pump-turbine,a crucial step to do this is a deeper study of the S-region characteristics through considering its tip-gap flows.This paper presents numerical simulations of the 3-D steady flows in a prototype pump-turbine in China,using a RNG k-ε turbulence model.The pressure distributions,flow regimes and structures,and vortex distributions in the main channel and tip gaps are analyzed,and it is deviated from design operation,the pressure gradient keeps increasing sharply in both the vaneless section and tip-gap passages,until its maximum value occurs under reverse pump operation.A circumferentially distributed ring forms in the vaneless section is found,which retains a high pressure and a huge pressure difference from its surroundings,thereby causing unstable operation,vibration and noise.This is an important cause of the S-shaped characteristics,and deepens our understanding of ultra-high head pumped storage units for better hydraulic designs.关键词
超高水头抽水蓄能机组/转轮水力间隙/长短叶片/S特性区/旋涡分布Key words
ultra-high head pump-turbine/hydraulic clearance of impeller/long and short blades/S-characteristic region/vortex distribution分类
能源科技引用本文复制引用
周强,舒崚峰,李成军,陈勇,付晓龙,李德友,宫汝志,王洪杰..考虑转轮间隙流的水泵水轮机S区流态演化研究[J].水力发电学报,2025,44(7):121-130,10.基金项目
国家自然科学基金项目(52209108) （52209108）
黑龙江省自然科学基金联合引导项目(Grant No.HL2023E058) （Grant No.HL2023E058）
