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    Cavitation surge modelling in Francis turbine draft tube

    New search for: Alligne, Sébastien
    New search for: Nicolet, Christophe
    New search for: Tsujimoto, Yoshinobu
    New search for: Avellan, François

    Francis turbines may experience cavitation surge phenomenon in the draft tube inducing large pressure fluctuations which can jeopardize the hydraulic system integrity. To predict this phenomenon, a one-dimensional draft tube model is derived from flow momentum and continuity equations including the convective terms that are not considered in the existing models. A parametric analysis of the draft tube model is carried out to investigate the influence of parameters on the cavitation surge onset identified by the hydraulic system stability. It is shown that convective terms have a stabilizing influence modifying stability limit prediction driven by the divergent geometry modelling of the draft tube.

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    Cavitation surge modelling in Francis turbine draft tube

    New search for: Alligne, Sébastien
    New search for: Nicolet, Christophe
    New search for: Tsujimoto, Yoshinobu
    New search for: Avellan, François

    Francis turbines may experience cavitation surge phenomenon in the draft tube inducing large pressure fluctuations which can jeopardize the hydraulic system integrity. To predict this phenomenon, a one-dimensional draft tube model is derived from flow momentum and continuity equations including the convective terms that are not considered in the existing models. A parametric analysis of the draft tube model is carried out to investigate the influence of parameters on the cavitation surge onset identified by the hydraulic system stability. It is shown that convective terms have a stabilizing influence modifying stability limit prediction driven by the divergent geometry modelling of the draft tube.

    Access

    Check access
    Check availability in my library
    Order at Subito €

    Cavitation surge modelling in Francis turbine draft tube

    New search for: Alligne, Sébastien
    New search for: Nicolet, Christophe
    New search for: Tsujimoto, Yoshinobu
    New search for: Avellan, François

    Francis turbines may experience cavitation surge phenomenon in the draft tube inducing large pressure fluctuations which can jeopardize the hydraulic system integrity. To predict this phenomenon, a one-dimensional draft tube model is derived from flow momentum and continuity equations including the convective terms that are not considered in the existing models. A parametric analysis of the draft tube model is carried out to investigate the influence of parameters on the cavitation surge onset identified by the hydraulic system stability. It is shown that convective terms have a stabilizing influence modifying stability limit prediction driven by the divergent geometry modelling of the draft tube.

    Access

    Check access
    Check availability in my library
    Order at Subito €

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    Title:

    Cavitation surge modelling in Francis turbine draft tube

    Contributors:

    Alligne, Sébastien (author) / Nicolet, Christophe (author) / Tsujimoto, Yoshinobu (author) / Avellan, François (author)

    Published in:

    Journal of Hydraulic Research ; 52 ; 399-411

    Publication date:

    2014-05-04

    Size:

    13 pages

    ISSN:

    0022-1686 , 1814-2079

    DOI:

    https://doi.org/10.1080/00221686.2013.854847

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    English

    Keywords:

    Cavitation , flow instabilities , Francis turbine , one-dimensional models , rotating and swirling flows , vortex rope

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