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    Multirow Film-Cooling Effectiveness of Vertically Oriented Slot Cross-Section Diffusion Holes on a Turbine Nozzle Guide Vane Suction Surface

    Source: Journal of Turbomachinery:;2024:;volume( 147 ):;issue: 006::page 61015-1
    Author:
    Hu, Jia-Jun
    ,
    An, Bai-Tao
    DOI: 10.1115/1.4067239
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this article, a multirow film-cooling effectiveness experiment was conducted on a turbine nozzle guide vane suction surface using the pressure-sensitive paint (PSP) measurement technique. Five rows of film holes were designed at the suction side with a streamwise staggered arrangement and a 6D spanwise hole spacing. Two diffusion holes constructed based on a vertically oriented slot cross-section with 14-deg and 20-deg exit expansion angles were tested. A fan-shaped hole and a horizontally oriented slot cross-section diffusion hole were chosen as the baselines, and both had a 14-deg exit expansion angle. The experiment was carried out in a linear cascade with a mainstream Reynolds number of 62000, a mainstream turbulence intensity of 3.7%, and a coolant-to-mainstream density ratio of 1.5. The four averaged blowing ratios ranged from 0.5 to 2.0. The results showed that, regardless of the blowing ratio, under intense multirow film interactions, the vertically oriented slot cross-section diffusion holes can always produce uniform and consistent film coverage on the vane suction surface. The vertically oriented slot cross-section widens the distance between the up- and downstream walls and narrows the lateral width, thereby weakening the influence of the entrance “jetting effect.” The resulting flow pattern can adapt to a larger exit expansion angle. In addition to the smaller difference under a low blowing ratio, two vertically oriented slot cross-section diffusion holes yield prominently greater multirow effectiveness than do the horizontally oriented slot cross-section diffusion hole and conventional fan-shaped hole, in which the case with a 20-deg expansion angle performs better.
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      Multirow Film-Cooling Effectiveness of Vertically Oriented Slot Cross-Section Diffusion Holes on a Turbine Nozzle Guide Vane Suction Surface

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    contributor authorHu, Jia-Jun
    contributor authorAn, Bai-Tao
    date accessioned2025-04-21T09:56:11Z
    date available2025-04-21T09:56:11Z
    date copyright12/17/2024 12:00:00 AM
    date issued2024
    identifier issn0889-504X
    identifier otherturbo_147_6_061015.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4305147
    description abstractIn this article, a multirow film-cooling effectiveness experiment was conducted on a turbine nozzle guide vane suction surface using the pressure-sensitive paint (PSP) measurement technique. Five rows of film holes were designed at the suction side with a streamwise staggered arrangement and a 6D spanwise hole spacing. Two diffusion holes constructed based on a vertically oriented slot cross-section with 14-deg and 20-deg exit expansion angles were tested. A fan-shaped hole and a horizontally oriented slot cross-section diffusion hole were chosen as the baselines, and both had a 14-deg exit expansion angle. The experiment was carried out in a linear cascade with a mainstream Reynolds number of 62000, a mainstream turbulence intensity of 3.7%, and a coolant-to-mainstream density ratio of 1.5. The four averaged blowing ratios ranged from 0.5 to 2.0. The results showed that, regardless of the blowing ratio, under intense multirow film interactions, the vertically oriented slot cross-section diffusion holes can always produce uniform and consistent film coverage on the vane suction surface. The vertically oriented slot cross-section widens the distance between the up- and downstream walls and narrows the lateral width, thereby weakening the influence of the entrance “jetting effect.” The resulting flow pattern can adapt to a larger exit expansion angle. In addition to the smaller difference under a low blowing ratio, two vertically oriented slot cross-section diffusion holes yield prominently greater multirow effectiveness than do the horizontally oriented slot cross-section diffusion hole and conventional fan-shaped hole, in which the case with a 20-deg expansion angle performs better.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleMultirow Film-Cooling Effectiveness of Vertically Oriented Slot Cross-Section Diffusion Holes on a Turbine Nozzle Guide Vane Suction Surface
    typeJournal Paper
    journal volume147
    journal issue6
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4067239
    journal fristpage61015-1
    journal lastpage61015-12
    page12
    treeJournal of Turbomachinery:;2024:;volume( 147 ):;issue: 006
    contenttypeFulltext
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