RESEARCH ON PUMP STRUCTURE OPTIMIZATION OF FRANCIS TURBINE UPPER CROWN RUNNER BASED ON CFD

被引：0
|
作者：
Gui X. [1 ,2 ]
Mu Z. [1 ,2 ]
Guo T. [1 ,2 ]
Xia Q. [1 ,2 ]
Zhang Z. [3 ]
机构：
[1] College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi
[2] Xinjiang Key Laboratory of Water Conservancy Engineering Safety and Water Disaster Prevention, Urumqi
[3] Hongshanzui Hydropower Station, Xinjiang Tianfu Energy Co.，Ltd., Shihezi
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 01期
关键词：
efficiency; Francis turbine; leakage; main shaft seal; numerical simulation; runner pump;
D O I：
10.19912/j.0254-0096.tynxb.2021-0883
中图分类号：
学科分类号：
摘要：
In order to study the working characteristics and optimization feasibility of the upper crown runner pump of medium and high head Francis turbine，taking the No. 3 turbine of Hongshanzui First Stage Power Station as an example，the existing runner pump and 11 structural optimization models are established，using CFD commercial software，based on The SST turbulence model carries out numerical simulations of runner pumps with different structures under 9 flow conditions. Taking the leakage flow characteristics of the upper crown channel，the vacuum degree of the main shaft seal and the working efficiency of the runner pump as the research indexes，the results show that the leakage flow characteristics of the upper crown channel depend on the structure type of the runner pump；reducing the pump cover height ratio" of runner pump or inclining the pump blades has a significant effect on improving the vacuum degree of main shaft seal （the best structure can increase 66.9%），and its working efficiency must be considered at the same time；under the rated working condition，the working efficiency of the runner pump is low，therefore it is recommended to set up appropriate drain holes on the upper crown of the runner to make up the flow and improve its efficiency； the power station can set the pump blades at an angle of 45° and the runner pump with pump cover height ratio HP=0.0543 as the best improvement scheme. The study quantifies the structural parameters of the upper crown runner pump，which makes the conclusion universal，and provides a certain reference basis for adding runner pump at the top of the upper crown of medium and high head Francis turbine and its optimization. © 2023 Science Press. All rights reserved."
引用
收藏
页码：377 / 383
页数：6
相关论文
共 19 条
  • [1] ZENG Z L., The structure and operating characteristics of high- head mixed- flow turbine［J］, Water power, 9, pp. 37-39, (2006)
  • [2] YANG T H., Research on the working characteristics of the top cover of Francis turbine and the pump plate of the upper crown of the runner［D］, (2016)
  • [3] LI Q F, ZHANG Z J，, QUAN H, Et al., Analysis of cavitation flow and axial force of runner for water pump turbine［J］, Acta energiae solaris sinica, 41, 3, pp. 192-198, (2020)
  • [4] KIM T S, CHA K S., Comparative analysis of the influence of labyrinth seal configuration on leakage behavior［J］, Journal of mechanical science and technology, 23, 10, pp. 2830-2838, (2009)
  • [5] RAVI K, HARI P N, JANG H L., Effect of guide vane clearance gap on francis turbine performance［J］, Energies, 9, 4, pp. 259-268, (2016)
  • [6] KANG J., Experience of using pump blades in intake technology of water turbine roof［J］, Journal of hydroelectric power, 1, pp. 79-86, (1989)
  • [7] YANG E H，, WU G, YANG T H，, Et al., Influence of the upper crown pump plate of the turbine runner of Huang deng hydropower station on the water withdrawal from the top cover［J］, Water power energy science, 34, 10, pp. 150-153, (2016)
  • [8] GAO Y, ZHANG W B, JIANG Q F，, Et al., Optimal design of runner pump of water turbine unit based on response surface method［J］, Water power, 43, 2, pp. 67-72, (2017)
  • [9] LI G L., Analysis of water turbine top cover discharge and pressure reducing and cooling water taken from the top cover［J］, Design of hydreelectric power station, 1, pp. 28-32, (1998)
  • [10] GUO F S，, JIA M, Et al., Numerical simulation of vertical axis tidal current turbine group［J］, Acta energiae solaris sinica, 35, 9, pp. 1810-1815, (2014)
12