Cavitation surge in a small model test facility simulating a hydraulic power plant

Koichi Yonezawa, Daisuke Konishi, Kazuyoshi Miyagawa, François Avellan, Peter Doerfler, Yoshinobu Tsujimoto

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Model tests and CFD were carried out to find out the cause of cavitation surge in hydraulic power plants. In experiments the cavitation surge was observed at flow rates higher and lower than the swirl free flow rate, both with and without a surge tank placed just upstream of the inlet volute. The surge frequency at smaller flow rate was much smaller than the swirl mode frequency caused by the whirl of vortex rope. An unsteady CFD was carried out with two boundary conditions: (1) the flow rate is fixed to be constant at the volute inlet, (2) the total pressure is kept constant at the volute inlet, corresponding to the experiments without/with the surge tank. The surge was observed with both boundary conditions at both higher and lower flow rates. Discussions as to the cause of the surge are made based on additional tests with an orifice at the diffuser exit, and with the diffuser replaced with a straight pipe.

    Original languageEnglish
    Pages (from-to)152-160
    Number of pages9
    JournalInternational Journal of Fluid Machinery and Systems
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Surges (fluid)
    Test facilities
    Cavitation
    Power plants
    Flow rate
    Hydraulics
    Surge tanks
    Computational fluid dynamics
    Boundary conditions
    Orifices
    Vortex flow
    Experiments
    Pipe

    Keywords

    • Cavitation
    • Draft tube surge
    • Hydro turbine

    ASJC Scopus subject areas

    • Industrial and Manufacturing Engineering
    • Mechanical Engineering

    Cite this

    Cavitation surge in a small model test facility simulating a hydraulic power plant. / Yonezawa, Koichi; Konishi, Daisuke; Miyagawa, Kazuyoshi; Avellan, François; Doerfler, Peter; Tsujimoto, Yoshinobu.

    In: International Journal of Fluid Machinery and Systems, Vol. 5, No. 4, 2012, p. 152-160.

    Research output: Contribution to journalArticle

    Yonezawa, Koichi ; Konishi, Daisuke ; Miyagawa, Kazuyoshi ; Avellan, François ; Doerfler, Peter ; Tsujimoto, Yoshinobu. / Cavitation surge in a small model test facility simulating a hydraulic power plant. In: International Journal of Fluid Machinery and Systems. 2012 ; Vol. 5, No. 4. pp. 152-160.
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