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Experimental research of a high specific speed low-head model Francis turbine – A case study with emphasis on flow visualisation under runner using PIV method and energy production analysis

Author

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  • Krzemianowski, Zbigniew
  • Przybyliński, Tomasz
  • Karwacki, Jarosław
  • Tomaszewski, Adam

Abstract

Currently, there are many low-head facilities in hydropower equipped with Francis hydrounits, whose flow systems are inadequate for the heads under which they should operate. The paper presents performance investigations of a model Francis turbine with a kinematic specific speed of 94. Experimental investigations were carried out in a wide range of changes of the guide vane opening angle and the rotational speed. The efficiency reached 89% at high values of the double reduced flow rate Q11 = 1.033 m3/s and the double reduced rotational speed n11 = 93 rpm.

Suggested Citation

  • Krzemianowski, Zbigniew & Przybyliński, Tomasz & Karwacki, Jarosław & Tomaszewski, Adam, 2025. "Experimental research of a high specific speed low-head model Francis turbine – A case study with emphasis on flow visualisation under runner using PIV method and energy production analysis," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225033535
    DOI: 10.1016/j.energy.2025.137711
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    References listed on IDEAS

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    1. Trivedi, Chirag & Iliev, Igor & Dahlhaug, Ole Gunnar & Markov, Zoran & Engstrom, Fredrik & Lysaker, Henning, 2020. "Investigation of a Francis turbine during speed variation: Inception of cavitation," Renewable Energy, Elsevier, vol. 166(C), pages 147-162.
    2. Trivedi, Chirag & Agnalt, Einar & Dahlhaug, Ole Gunnar, 2018. "Experimental study of a Francis turbine under variable-speed and discharge conditions," Renewable Energy, Elsevier, vol. 119(C), pages 447-458.
    3. Damian Liszka & Zbigniew Krzemianowski & Tomasz Węgiel & Dariusz Borkowski & Andrzej Polniak & Konrad Wawrzykowski & Artur Cebula, 2022. "Alternative Solutions for Small Hydropower Plants," Energies, MDPI, vol. 15(4), pages 1-31, February.
    4. Punys, Petras & Kvaraciejus, Algis & Dumbrauskas, Antanas & Šilinis, Linas & Popa, Bogdan, 2019. "An assessment of micro-hydropower potential at historic watermill, weir, and non-powered dam sites in selected EU countries," Renewable Energy, Elsevier, vol. 133(C), pages 1108-1123.
    5. Wen-Tao Su & Wei Zhao & Maxime Binama & Yue Zhao & Jian-Ying Huang & Xue-Ren Chen, 2022. "Experimental Francis Turbine Cavitation Performances of a Hydro-Energy Plant," Sustainability, MDPI, vol. 14(6), pages 1-20, March.
    6. Krzemianowski, Zbigniew & Steller, Janusz, 2021. "High specific speed Francis turbine for small hydro purposes - Design methodology based on solving the inverse problem in fluid mechanics and the cavitation test experience," Renewable Energy, Elsevier, vol. 169(C), pages 1210-1228.
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    1. Krzemianowski, Zbigniew & Steller, Janusz & Janicki, Waldemar & Góralczyk, Adam, 2025. "Cavitation and runaway experimental research of a very high specific speed low-head model Francis turbine – A case study with emphasis on flow analysis in the draft tube," Energy, Elsevier, vol. 337(C).

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