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

Zbigniew Krzemianowski, Tomasz Przybyliński, Jarosław Karwacki and Adam Tomaszewski

Energy, 2025, vol. 334, issue C

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.

Keywords: High specific speed Francis turbine; Low-head Francis turbines; Basic performance hydraulic turbine investigations; Scale effect of a prototype turbine; Particle Image Velocimetry; Flow visualization (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225033535

DOI: 10.1016/j.energy.2025.137711

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