Wicket gate trailing-edge blowing: A method for improving off-design hydroturbine performance by adjusting the runner inlet swirl angle

B. J. Lewis, John Michael Cimbala, A. M. Wouden

    Research output: Contribution to journalConference article

    4 Citations (Scopus)

    Abstract

    At their best efficiency point (BEP), hydroturbines operate at very high efficiency. However, with the ever-increasing penetration of alternative electricity generation, it has become common to operate hydroturbines at off-design conditions in order to maintain stability in the electric power grid. This paper demonstrates a method for improving hydroturbine performance during off-design operation by injecting water through slots at the trailing edges of the wicket gates. The injected water causes a change in bulk flow direction at the inlet of the runner. This change in flow angle from the wicket gate trailing-edge jets provides the capability of independently varying the flow rate and swirl angle through the runner, which in current designs are both determined by the wicket gate opening angle. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation.

    Original languageEnglish (US)
    Article number012021
    JournalIOP Conference Series: Earth and Environmental Science
    Volume22
    DOIs
    StatePublished - Jan 1 2014
    Event27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014 - Montreal, Canada
    Duration: Sep 22 2014Sep 26 2014

    Fingerprint

    electricity generation
    turbine
    penetration
    water
    method
    rate
    electric power

    All Science Journal Classification (ASJC) codes

    • Environmental Science(all)
    • Earth and Planetary Sciences(all)

    Cite this

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    abstract = "At their best efficiency point (BEP), hydroturbines operate at very high efficiency. However, with the ever-increasing penetration of alternative electricity generation, it has become common to operate hydroturbines at off-design conditions in order to maintain stability in the electric power grid. This paper demonstrates a method for improving hydroturbine performance during off-design operation by injecting water through slots at the trailing edges of the wicket gates. The injected water causes a change in bulk flow direction at the inlet of the runner. This change in flow angle from the wicket gate trailing-edge jets provides the capability of independently varying the flow rate and swirl angle through the runner, which in current designs are both determined by the wicket gate opening angle. When properly tuned, altering the flow angle results in a significant improvement in turbine efficiency during off-design operation.",
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