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Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Author

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  • Lucie Zemanová

    (Victor Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic)

  • Pavel Rudolf

    (Victor Kaplan Department of Fluid Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic)

Abstract

The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machines.

Suggested Citation

  • Lucie Zemanová & Pavel Rudolf, 2020. "Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review," Energies, MDPI, vol. 13(24), pages 1-37, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6617-:d:462368
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    References listed on IDEAS

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    1. Chirag Trivedi & Michel J. Cervantes & Ole G. Dahlhaug, 2016. "Experimental and Numerical Studies of a High-Head Francis Turbine: A Review of the Francis-99 Test Case," Energies, MDPI, vol. 9(2), pages 1-24, January.
    2. Trivedi, Chirag & Cervantes, Michel J., 2017. "Fluid-structure interactions in Francis turbines: A perspective review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 87-101.
    3. Thapa, Biraj Singh & Thapa, Bhola & Dahlhaug, Ole G., 2012. "Empirical modelling of sediment erosion in Francis turbines," Energy, Elsevier, vol. 41(1), pages 386-391.
    4. Su, Xianghui & Huang, Si & Zhang, Xuejiao & Yang, Sunsheng, 2016. "Numerical research on unsteady flow rate characteristics of pump as turbine," Renewable Energy, Elsevier, vol. 94(C), pages 488-495.
    5. Daqing Zhou & Huixiang Chen & Jie Zhang & Shengwen Jiang & Jia Gui & Chunxia Yang & An Yu, 2019. "Numerical Study on Flow Characteristics in a Francis Turbine during Load Rejection," Energies, MDPI, vol. 12(4), pages 1-15, February.
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    Cited by:

    1. Lilian Chabannes & David Štefan & Pavel Rudolf, 2021. "Effect of Splitter Blades on Performances of a Very Low Specific Speed Pump," Energies, MDPI, vol. 14(13), pages 1-13, June.

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