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    Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow

    Source: Journal of Turbomachinery:;2024:;volume( 146 ):;issue: 005::page 51011-1
    Author:
    Straub, Douglas
    ,
    Weber, Justin
    ,
    Roy, Arnab
    ,
    Lee, Chien-Shing
    ,
    Shih, Tom I-P.
    DOI: 10.1115/1.4064316
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Counter-rotating vortices, formed by the interaction of film-cooling jets and the hot gas flow, adversely affect the performance of conventional film-cooling designs. Downstream vortex generators have been shown to improve cooling effectiveness by mitigating the effects of the counter-rotating vortices and by deflecting the cooling jet laterally. In this study, computational and experimental methods were used to examine how cylindrical film-cooling holes (D = 3.2 mm, L/D = 6, p/D = 3, α = 30 deg) with and without downstream vortex generators perform when the coolant supply channel is perpendicular to the direction of the hot gas. For this study, the hot gas had a temperature of 650 K and an average Mach number of 0.23. The hot-gas-to-coolant temperature ratio was 1.9, and two blowing ratios (0.75 and 1.0) were studied. Results from the computational fluid dynamics study show how crossflow affects the interaction between the film-cooling jet and hot gas flow with and without downstream vortex generators. The experimental measurements were based on infrared thermography in a conjugate heat transfer environment. Results were obtained for film-cooling performance in terms of overall effectiveness, film effectiveness, and local heat transfer coefficients. The downstream vortex generators can increase the laterally averaged effectiveness by a factor of 1.5 relative to cylindrical holes, but this higher performance is restricted to low crossflow velocities and higher blowing ratios.
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      Effects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow

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    contributor authorStraub, Douglas
    contributor authorWeber, Justin
    contributor authorRoy, Arnab
    contributor authorLee, Chien-Shing
    contributor authorShih, Tom I-P.
    date accessioned2024-04-24T22:50:43Z
    date available2024-04-24T22:50:43Z
    date copyright1/16/2024 12:00:00 AM
    date issued2024
    identifier issn0889-504X
    identifier otherturbo_146_5_051011.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4295973
    description abstractCounter-rotating vortices, formed by the interaction of film-cooling jets and the hot gas flow, adversely affect the performance of conventional film-cooling designs. Downstream vortex generators have been shown to improve cooling effectiveness by mitigating the effects of the counter-rotating vortices and by deflecting the cooling jet laterally. In this study, computational and experimental methods were used to examine how cylindrical film-cooling holes (D = 3.2 mm, L/D = 6, p/D = 3, α = 30 deg) with and without downstream vortex generators perform when the coolant supply channel is perpendicular to the direction of the hot gas. For this study, the hot gas had a temperature of 650 K and an average Mach number of 0.23. The hot-gas-to-coolant temperature ratio was 1.9, and two blowing ratios (0.75 and 1.0) were studied. Results from the computational fluid dynamics study show how crossflow affects the interaction between the film-cooling jet and hot gas flow with and without downstream vortex generators. The experimental measurements were based on infrared thermography in a conjugate heat transfer environment. Results were obtained for film-cooling performance in terms of overall effectiveness, film effectiveness, and local heat transfer coefficients. The downstream vortex generators can increase the laterally averaged effectiveness by a factor of 1.5 relative to cylindrical holes, but this higher performance is restricted to low crossflow velocities and higher blowing ratios.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleEffects of Downstream Vortex Generators on Film Cooling a Flat Plate Fed by Crossflow
    typeJournal Paper
    journal volume146
    journal issue5
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4064316
    journal fristpage51011-1
    journal lastpage51011-15
    page15
    treeJournal of Turbomachinery:;2024:;volume( 146 ):;issue: 005
    contenttypeFulltext
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