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    The Measured Flow at the Inlet of a Francis Turbine Runner Operating in Speed No-Load Condition

    Source: Journal of Fluids Engineering:;2024:;volume( 146 ):;issue: 011::page 111203-1
    Author:
    Rezavand Hesari, Araz
    ,
    Munoz, Anthony
    ,
    Coulaud, Maxime
    ,
    Houde, Sébastien
    ,
    Maciel, Yvan
    DOI: 10.1115/1.4065384
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: For Francis turbines, speed-no-load (SNL) represents one of the most detrimental operating conditions, marked by significant pressure and strain fluctuations on the runner. Mitigating these fluctuations necessitates a comprehensive understanding and characterization of the flow phenomena responsible for their generation. This paper presents an experimental investigation of the flow at the inlet of a Francis turbine runner model operating in speed-no-load condition using high-speed stereoscopic and endoscopic particle image velocimetry (PIV). The measurements are made in a radial-azimuthal plane that covers the vaneless space and a large region in the interblade channel. This study marks the first-time measurement of critical flow phenomena at this operating point, performed in the runner. Instantaneous and average velocity fields are analyzed, along with other statistical data. The results not only confirm the stochastic nature of the flow at speed-no-load but also highlight the general structure of the flow observed in other studies. The high velocity fluctuations on the suction side are associated with a backflow extending into the vaneless space and a circulation zone occasionally generated by this backflow. Both phenomena are frequently present, but fluctuate stochastically. Additionally, two other circulation zones intermittently form on the pressure side of the blades. The presence of vortices, smaller than the circulation zones, near the blade's leading edge correlates with the backflow intensity.
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      The Measured Flow at the Inlet of a Francis Turbine Runner Operating in Speed No-Load Condition

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4306519
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    contributor authorRezavand Hesari, Araz
    contributor authorMunoz, Anthony
    contributor authorCoulaud, Maxime
    contributor authorHoude, Sébastien
    contributor authorMaciel, Yvan
    date accessioned2025-04-21T10:35:49Z
    date available2025-04-21T10:35:49Z
    date copyright5/20/2024 12:00:00 AM
    date issued2024
    identifier issn0098-2202
    identifier otherfe_146_11_111203.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306519
    description abstractFor Francis turbines, speed-no-load (SNL) represents one of the most detrimental operating conditions, marked by significant pressure and strain fluctuations on the runner. Mitigating these fluctuations necessitates a comprehensive understanding and characterization of the flow phenomena responsible for their generation. This paper presents an experimental investigation of the flow at the inlet of a Francis turbine runner model operating in speed-no-load condition using high-speed stereoscopic and endoscopic particle image velocimetry (PIV). The measurements are made in a radial-azimuthal plane that covers the vaneless space and a large region in the interblade channel. This study marks the first-time measurement of critical flow phenomena at this operating point, performed in the runner. Instantaneous and average velocity fields are analyzed, along with other statistical data. The results not only confirm the stochastic nature of the flow at speed-no-load but also highlight the general structure of the flow observed in other studies. The high velocity fluctuations on the suction side are associated with a backflow extending into the vaneless space and a circulation zone occasionally generated by this backflow. Both phenomena are frequently present, but fluctuate stochastically. Additionally, two other circulation zones intermittently form on the pressure side of the blades. The presence of vortices, smaller than the circulation zones, near the blade's leading edge correlates with the backflow intensity.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThe Measured Flow at the Inlet of a Francis Turbine Runner Operating in Speed No-Load Condition
    typeJournal Paper
    journal volume146
    journal issue11
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4065384
    journal fristpage111203-1
    journal lastpage111203-12
    page12
    treeJournal of Fluids Engineering:;2024:;volume( 146 ):;issue: 011
    contenttypeFulltext
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