水力发电学报2024，Vol.43Issue(4)：73-80,8.DOI:10.11660/slfdxb.20240407
喷针开度对冲击式水轮机转轮水力性能影响研究
Influence of opening on the Pelton turbine runner hydraulic performance
摘要
Abstract
Pelton turbines are suitable for converting the hydropower of medium,high and ultra-high heads,and has broad application prospect for harvesting high head hydropower in Southwest China.In this work,numerical simulations of the three-dimensional multi-phase flow were conducted in a model Pelton turbine designed for the Zixia hydropower plant in Tibet,focusing on its hydraulic performance and internal flow characteristics impacted by a single jet with five different openings.The predicted results show that under the design operating head,the hydraulic efficiency of the turbine reaches the highest under the optimal opening,and lowers as the opening deviates from its optimum.Hydraulic efficiency variation varies gently between the range of 0.75 to 1.60 times of the design discharge,with an efficiency drop less than 1%from the optimum.The comparative analysis of the unsteady flow behaviors in the runner bucket at three different opening conditions reveals the occurrence of leakage discharge at the bucket cutout,which aggravates significantly as the opening exceeds the optimum,accounting for the increase in hydraulic loss.This study provides reference for the design of the Zixia hydropower plant 230 MW large capacity Pelton turbine unit.关键词
冲击式水轮机转轮/喷针开度/水力性能/非定常水膜流/数值分析Key words
Pelton turbine runner/opening/hydraulic performance/unsteady water sheet flow/numerical simulation分类
机械工程引用本文复制引用
李彦浩,刘子实,肖业祥,梁权伟,刘洁,王钊宁..喷针开度对冲击式水轮机转轮水力性能影响研究[J].水力发电学报,2024,43(4):73-80,8.基金项目
国家自然科学基金项目(52279088) （52279088）
上海勘测设计研究院有限公司科研项目资助(2021SD(8)-007) （2021SD(8）
中国长江三峡集团有限公司科研项目资助(SXXZ/0416) （SXXZ/0416）
