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Characterization of the Effects of Ingested Bodies on the Rotor–Stator Interaction of Hydraulic Turbines

Author

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  • Alfredo Guardo

    (Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain)

  • Alfred Fontanals

    (Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain)

  • Mònica Egusquiza

    (Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain)

  • Carme Valero

    (Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain)

  • Eduard Egusquiza

    (Centre de Diagnòstic Industrial i Fluidodinàmica, Universitat Politècnica de Catalunya BarcelonaTECH (UPC-CDIF), Av. Diagonal, 647, 08028 Barcelona, Spain)

Abstract

Runner and distributor blockages in hydraulic turbines occur due to the ingestion of external bodies such as rocks or logs. These obstructions can change the amplitude and uniformity of the pressure pulsations in the machine, creating large unbalanced forces that can lead to reduced efficiency, increased vibration and mechanical damage. In this paper, the effects of obstructions caused by ingested bodies in the runner and the distributor of a pump turbine on its internal pressure pulsation were investigated by means of computational fluid dynamics. A numerical model of an unobstructed pump turbine is presented and validated against experimental data. Several cases of runner or distributor blockage were studied, and their RSI pressure pulsations were recorded and analyzed at different locations. The results obtained allow us to characterize the effect of these blockages on the machine’s RSI, which can be helpful for the correct diagnosis of these types of damage.

Suggested Citation

  • Alfredo Guardo & Alfred Fontanals & Mònica Egusquiza & Carme Valero & Eduard Egusquiza, 2021. "Characterization of the Effects of Ingested Bodies on the Rotor–Stator Interaction of Hydraulic Turbines," Energies, MDPI, vol. 14(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6669-:d:656645
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    References listed on IDEAS

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    1. Xin Liu & Yongyao Luo & Alexandre Presas & Zhengwei Wang & Lingjiu Zhou, 2018. "Cavitation Effects on the Structural Resonance of Hydraulic Turbines: Failure Analysis in a Real Francis Turbine Runner," Energies, MDPI, vol. 11(9), pages 1-16, September.
    2. Thapa, Biraj Singh & Dahlhaug, Ole Gunnar & Thapa, Bhola, 2015. "Sediment erosion in hydro turbines and its effect on the flow around guide vanes of Francis turbine," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 1100-1113.
    3. Liu, Xin & Luo, Yongyao & Wang, Zhengwei, 2016. "A review on fatigue damage mechanism in hydro turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1-14.
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