Multiphase computation of cavitation breakdown in model and prototype scale Francis turbines

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Scopus citations

    Abstract

    Steady-periodic multiphase Computational Fluid Dynamics (CFD) simulations were conducted to capture cavitation breakdown in a Francis hydroturbine due to largescale vaporous structures. A reduced-scale model and a full-scale prototype were investigated to display differences in vapor content and machine performance caused by lack of Reynolds and Froude similarity. The model scale efficiencies compared favorably (within 3%) to the experimental cavitation tests. The CFD model and prototype displayed distinct qualitative and quantitative differences as σ was reduced. A stage-by-stage analysis was conducted to assess the effect of cavitation on loss distribution throughout the machine. Furthermore, a formal mesh refinement study was conducted on efficiency and volume of vapor, with three mesh levels and Richardson extrapolation, to ensure convergence.

    Original languageEnglish (US)
    Title of host publicationFora
    PublisherAmerican Society of Mechanical Engineers
    ISBN (Electronic)9780791857229
    DOIs
    StatePublished - 2015
    EventASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015 - Seoul, Korea, Republic of
    Duration: Jul 26 2015Jul 31 2015

    Publication series

    NameASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015
    Volume2

    Other

    OtherASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015
    Country/TerritoryKorea, Republic of
    CitySeoul
    Period7/26/157/31/15

    All Science Journal Classification (ASJC) codes

    • Fluid Flow and Transfer Processes

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