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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

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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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