Unsteady computational fluid dynamic analysis of the behavior of guide vane trailing-edge injection and its effects on downstream rotor performance in a francis hydroturbine

Bryan J. Lewis, John Michael Cimbala

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    A unique guide vane design, which includes trailing-edge jets, is presented for a mixedflow Francis hydroturbine. The water injection causes a change in bulk flow direction at the inlet of the rotor. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation. Unsteady CFD simulations show nearly 1% improvement in overall turbine efficiency with the use of injection. This revolutionary concept also has the ability to reduce the intensity of the rotor-stator interactions (RSI) by compensating for the momentum deficit of the wicket gate wakes. This technology may be equally applied to other turbomachinery devices with problematic rotor-stator flow misalignments.

    Original languageEnglish (US)
    Article number81001
    JournalJournal of Turbomachinery
    Volume137
    Issue number8
    DOIs
    StatePublished - Jan 1 2015

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    Dynamic analysis
    Computational fluid dynamics
    Rotors
    Stators
    Turbines
    Turbomachinery
    Water injection
    Momentum

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering

    Cite this

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    abstract = "A unique guide vane design, which includes trailing-edge jets, is presented for a mixedflow Francis hydroturbine. The water injection causes a change in bulk flow direction at the inlet of the rotor. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation. Unsteady CFD simulations show nearly 1{\%} improvement in overall turbine efficiency with the use of injection. This revolutionary concept also has the ability to reduce the intensity of the rotor-stator interactions (RSI) by compensating for the momentum deficit of the wicket gate wakes. This technology may be equally applied to other turbomachinery devices with problematic rotor-stator flow misalignments.",
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