水力发电学报2026，Vol.45Issue(2)：106-114,9.DOI:10.11660/slfdxb.20260209
可逆式转轮不同迷宫密封结构流动特性研究
Study on flow characteristics of different labyrinth seal structures of reversible runners
摘要
Abstract
This study addresses unclear energy dissipation mechanisms in complicated flows in the runner labyrinth ring section of a pump-turbine under the runaway condition,and examines how these flows affect the unit's overall hydraulic performance.We compare three seal types of crown labyrinth rings:ladder,serrated,and inclined-tooth,using a combined method of the high-resolution three-dimensional(3D)computational fluid dynamics(CFD)and the entropy production theory.The results indicate that of the three types,the inclined-tooth seal,through inducing a circumferential swirl,manifests the highest total entropy production and superior sealing performance.The serrated seal suppresses the leakage flows effectively and reduces the axial hydraulic thrust significantly,whereas the inclined-tooth seal tends to increase radial forces and cause pronounced fluctuations in the axial thrust.The performance of the ladder seal falls between the two.We have observed the labyrinth structure indirectly affects entropy production and vortex development in the runner and guide vane sections.The design of the upper crown labyrinth seal should balance local dissipation and overall stability-since the serrated type is suitable for controlling axial thrust,while the inclined-tooth type is ideal for applications requiring high sealing performance.This study lays a theoretical basis for optimizing the labyrinth seal design in pump-turbine runners.关键词
水泵水轮机/可逆式转轮/转轮密封间隙/CFD仿真/熵产理论Key words
pump-turbine/reversible runner/runner labyrinth seal clearance/CFD simulation/entropy production theory分类
能源科技引用本文复制引用
郑应霞,吴道科,舒崚峰,陈勇,付晓龙,宫汝志,王洪杰..可逆式转轮不同迷宫密封结构流动特性研究[J].水力发电学报,2026,45(2):106-114,9.基金项目
国家自然科学基金面上项目(52579084) （52579084）
