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Analysis of Pressure Fluctuation of a Pump-Turbine with Splitter Blades on Small Opening in Turbine Mode

Author

Listed:
  • Wei Xiao

    (Pumped-Storage Technological & Economic Research Institute State Grid Xinyuan Company Ltd., Beijing 100053, China)

  • Liu Chen

    (China Institute of Water Resources and Hydropower Research, Beijing 100048, China)

  • Shaocheng Ren

    (China Institute of Water Resources and Hydropower Research, Beijing 100048, China)

  • Bin Yan

    (Pumped-Storage Technological & Economic Research Institute State Grid Xinyuan Company Ltd., Beijing 100053, China)

  • Zishi Liu

    (State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Yexiang Xiao

    (State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

Abstract

Unstable flow in a pump-turbine can cause pressure pulsation, and the resulting vibration deteriorates the stability and operating safety of the unit. This study conducted three-dimensional numerical calculations of the overall flow passage of a pump-turbine with splitter blades under the small guide vane opening, and the unsteady flow characteristics of the turbine were investigated. The results showed that the pressure fluctuation was more severe at lower head operating conditions with lower efficiency, especially in the vaneless area (the runner blade passages). Under the lower head condition, the proportion of 12 times the rotational frequency (12 f / f n ) increased in the vaneless area, and the amplitude of 1 f / f n as well as 2 f / f n became larger in the runner blade channel, with more space occupied by vortices and reflux areas. A spiral vortex rope formed in the draft tube, increasing the proportion of 0.4 f / f n and 0.7 f / f n pressure pulses.

Suggested Citation

  • Wei Xiao & Liu Chen & Shaocheng Ren & Bin Yan & Zishi Liu & Yexiang Xiao, 2024. "Analysis of Pressure Fluctuation of a Pump-Turbine with Splitter Blades on Small Opening in Turbine Mode," Energies, MDPI, vol. 17(12), pages 1-16, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:12:p:2957-:d:1415673
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    References listed on IDEAS

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    1. Ruppert, Leopold & Schürhuber, Robert & List, Bernhard & Lechner, Alois & Bauer, Christian, 2017. "An analysis of different pumped storage schemes from a technological and economic perspective," Energy, Elsevier, vol. 141(C), pages 368-379.
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