变速抽水蓄能机组水力性能和尾水管涡流特性研究  

Hydraulic Performance and Draft Tube Internal Flow Characteristics in Variable-speed Pump Turbine

作　　者：于安 陈磊[1] 唐亦波 周大庆[1] Yu An;Chen Lei;Tang Yibo;Zhou Daqing(School of Electrical and Power Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学电气与动力工程学院,南京211100

出　　处：《水动力学研究与进展(A辑)》2024年第6期916-924,共9页Chinese Journal of Hydrodynamics

摘　　要：抽水蓄能机组在运行中会经常进行工况转换,经历大量的过渡过程,机组的性能和稳定性受到很大影响。变速抽水蓄能机组具有水泵功率有效调节、有功率高速调节及较强的进相运行能力,可实现自启动,适应更宽水头范围运行,是未来抽水蓄能技术发展的重要方向之一。该文基于三维数值模拟,对可变速水泵水轮机在水轮机工况的水力性能进行了深入分析,得到各出力下的最优转速;同时,基于熵产理论分析了水泵水轮机各部分的水力损失分布和损失来源;最后,借助尾水管内流特性的分析解释水力损失的形成机理。Pumped storage units often change their working conditions during operation,and their performance and stability are greatly affected by a large number of transition processes.The variable-speed pumped storage unit has the ability to effectively regulate the pump power,regulate the active power at a high speed and have strong leading phase operation capacity.It can realize self-starting and adapt to the operation in a wider head range.And it is one of the important directions for the development of pumped storage technology in the future.Based on 3D numerical simulation,the hydraulic performance of variable-speed pump turbine under turbine operating conditions is deeply analyzed,and the optimal speed under each output is obtained.At the same time,based on the entropy generation theory,the distribution and sources of hydraulic losses of each part of the pump turbine are analyzed.Finally,the formation mechanism of hydraulic loss is explained by the analysis of internal flow characteristics of draft tube.

关 键 词：可变速水泵水轮机 水轮机工况 能量特性 内流特性 尾水管涡带 

分 类 号：TU743[建筑科学—建筑技术科学]