水力发电学报2026，Vol.45Issue(6)：12-22,11.DOI:10.11660/slfdxb.20260602
抽水蓄能机组S特性区流动特性与能量损失机理研究
Study on flow behaviors and energy loss mechanisms in S-characteristic zone of pumped storage units
摘要
Abstract
To investigate the flow behaviors and energy loss mechanisms of a pumped storage unit operating in the S-characteristic zone,this study focuses on a model pump-turbine with a rated head of 451 m.Unsteady flows across the full flow passage are simulated numerically for the operating conditions in turbine,runaway,and braking modes;Distribution patterns and dominant mechanisms of energy losses are revealed by integrating an analysis of internal flow and the entropy production calculated using an improved near-wall loss function.The results indicate that near-wall entropy production accounts for 21.7%to 26.8%of the total,obviously a significant contribution;the major production,however,comes from the mainstream.The runner section contributes most of the total production,or in the 45%-51%range in the three typical modes,establishing it as the core region for energy dissipation and hydraulic excitation in S-zone operation.Key flow structures responsible for flow instability and increased energy loss include runner inlet backflows,blade channel vortices,and draft tube vortices.This study lays a basis for future studies of stable S-zone operation and hydraulic optimization of pumped storage units.关键词
抽水蓄能机组/"S"特性区/流动特性/能量损失/数值模拟Key words
pumped storage unit/S-characteristic zone/flow characteristics/energy loss/numerical simulation分类
能源科技引用本文复制引用
李春杰,周金鹏,符云衡,陈勇,付晓龙..抽水蓄能机组S特性区流动特性与能量损失机理研究[J].水力发电学报,2026,45(6):12-22,11.基金项目
国家自然科学基金面上项目(52579084) （52579084）
