水力发电学报2024，Vol.43Issue(5)：35-42,8.DOI:10.11660/slfdxb.20240504
1000MW水轮机转轮径向安装偏差对流动特征的影响
Influence of radial installation deviation on flow characteristics of 1000 MW hydro turbine runner
摘要
Abstract
Focused on a 1000 MW huge-capacity hydraulic turbine unit,this paper conducted three-dimensional steady internal flow numerical simulation using commercial code ANSYS.The impact of uneven clearance distribution on its internal flow characteristics of the turbine under the design operating point was investigated,considering radial installation deviations of 0.1 mm,0.3 mm,0.5 mm,1.5 mm,and 2.5 mm on the negative y-direction.The results revealed that within a certain range of deviation,the pressure in the corresponding region gradually rises with the decrease in clearance.However,once the deviation exceeded a certain threshold,water was unable to flow in,thus resulting in the formation of a low-pressure area.Furthermore,both the upper crown chamber and the bottom ring chamber exhibited an equal number of vortex evolving cycles with different vortex intensity,and the vortex was more intense in the upper crown chamber;The number of vortices is not an integer multiple of the blade number.Finally,we clarify that the vortex flow impact was greater on the inner wall of the bottom ring chamber than that of the upper crown chamber.This study is applicable to the design and installation of other large or medium size Francis turbines for improving their operational quality,reducing operating costs,and enhancing the overall efficiency of hydropower plants.关键词
百万千瓦转轮/混流式机组/径向安装偏差/流动特征/计算流体力学Key words
1000 MW runner/Francis turbine unit/radial installation deviation/flow characteristics/CFD分类
水利科学引用本文复制引用
吴思源,王一凡,刘兴民,黄星星,杜清玭,周凌九,陈端,王正伟..1000MW水轮机转轮径向安装偏差对流动特征的影响[J].水力发电学报,2024,43(5):35-42,8.基金项目
三峡建设公司(JGJD0322003) （JGJD0322003）
