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Inner Flow Analysis of Kaplan Turbine under Off-Cam Conditions

Author

Listed:
  • Dandan Yan

    (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China)

  • Haiqiang Luo

    (Guangxi Dateng Gorge Water Conservancy Project Development Co., Ltd., Guiping 530200, China)

  • Weiqiang Zhao

    (Institute of Renewable Energy and Energy Storage Technologies, PowerChina Renewable Energy Co., Ltd., Beijing 100101, China)

  • Yibin Wu

    (Guangxi Dateng Gorge Water Conservancy Project Development Co., Ltd., Guiping 530200, China)

  • Lingjiu Zhou

    (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
    Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing 100083, China)

  • Xiaofu Fan

    (Guangxi Dateng Gorge Water Conservancy Project Development Co., Ltd., Guiping 530200, China)

  • Zhengwei Wang

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

Abstract

Kaplan turbines are widely utilized in low-head and large flow power stations. This paper employs Computational Fluid Dynamics (CFD) to complete numerical calculations of the full flow channel under different blade angles and various guide vane openings, based on 25 off-cam experimental working conditions. The internal flow characteristics of the runner blade and draft tube are analyzed, and a discriminant number for quantitatively assessing the flow uniformity of the draft tube is proposed. The results indicate that low-frequency and high-amplitude pressure pulsations occur on the high- and low-pressure edge of the blade when the opening is small, with pulsations decreasing as the opening increases. The inner flow line of the draft tube is disturbed when both the blade angle and opening are small. Additionally, the secondary frequency of the draft tube inlet is double that of the vane passing frequency. The discriminant number of the flow inhomogeneity approaches 0 under optimal flow conditions. The number increases continuously with the decrease in efficiency, and the flow in the three piers of draft tube becomes more nonuniform. The research results provide a reference for enhancing performance and ensuring the operational stability of Kaplan turbines.

Suggested Citation

  • Dandan Yan & Haiqiang Luo & Weiqiang Zhao & Yibin Wu & Lingjiu Zhou & Xiaofu Fan & Zhengwei Wang, 2024. "Inner Flow Analysis of Kaplan Turbine under Off-Cam Conditions," Energies, MDPI, vol. 17(11), pages 1-21, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2548-:d:1401378
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    References listed on IDEAS

    as
    1. Arash Soltani Dehkharqani & Fredrik Engström & Jan-Olov Aidanpää & Michel J. Cervantes, 2019. "Experimental Investigation of a 10 MW Prototype Kaplan Turbine during Start-Up Operation," Energies, MDPI, vol. 12(23), pages 1-20, December.
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