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    Pulsating Film-Cooling Flow Over Smooth Cutback Surface at Airfoil Trailing Edge Measured by 2D3C-PTV

    Source: Journal of Heat Transfer:;2021:;volume( 143 ):;issue: 009::page 092101-1
    Author:
    Yamamoto, Shohei
    ,
    Murata, Akira
    ,
    Oho, Katsumi
    ,
    Hayakawa, Chihiro
    ,
    Hayakawa, Shumpei
    ,
    Iwamoto, Kaoru
    DOI: 10.1115/1.4051669
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The objective of this study is to clarify the effects of the film-cooling flow pulsation and the differences between the Strouhal number ratios of 1.0 and √2. The surface-averaged film cooling effectiveness for the Strouhal number ratios of 1.0 and √2 had decreased and increased, respectively, in comparison with the steady cooling flow in the authors' previous large eddy simulations. Subsequently, clarification on the possible reasons for these changes was sought. Measurements of the instantaneous velocity fields over the smooth cutback surface at two different pulsation frequencies were performed using two-dimensional three-component particle tracking velocimetry (2D3C-PTV). Notably, the power spectrum density of the wall-normal velocity fluctuations showed that the strongest peaks appeared at the pulsation frequencies, and the peak value for the Strouhal number ratio of 1.0 was much higher than those for the steady cooling flow and the Strouhal number ratio of √2. When the absolute Reynolds shear stresses integrated for the mixing-layer region were compared, those for the Strouhal number ratios of 1.0 and √2 were found to be higher and lower, respectively, than those for the steady cooling flow. Remarkably, the suppression of the turbulent mixing for the Strouhal number ratio √2 was caused by the suppressed development of the large-scale alternating vortices shed from the lip edge by imposing the cooling-flow pulsation at the frequency nonresonant with the vortex shedding frequency of the steady cooling flow.
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      Pulsating Film-Cooling Flow Over Smooth Cutback Surface at Airfoil Trailing Edge Measured by 2D3C-PTV

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    contributor authorYamamoto, Shohei
    contributor authorMurata, Akira
    contributor authorOho, Katsumi
    contributor authorHayakawa, Chihiro
    contributor authorHayakawa, Shumpei
    contributor authorIwamoto, Kaoru
    date accessioned2022-02-06T05:34:24Z
    date available2022-02-06T05:34:24Z
    date copyright7/22/2021 12:00:00 AM
    date issued2021
    identifier issn0022-1481
    identifier otherht_143_09_092101.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4278309
    description abstractThe objective of this study is to clarify the effects of the film-cooling flow pulsation and the differences between the Strouhal number ratios of 1.0 and √2. The surface-averaged film cooling effectiveness for the Strouhal number ratios of 1.0 and √2 had decreased and increased, respectively, in comparison with the steady cooling flow in the authors' previous large eddy simulations. Subsequently, clarification on the possible reasons for these changes was sought. Measurements of the instantaneous velocity fields over the smooth cutback surface at two different pulsation frequencies were performed using two-dimensional three-component particle tracking velocimetry (2D3C-PTV). Notably, the power spectrum density of the wall-normal velocity fluctuations showed that the strongest peaks appeared at the pulsation frequencies, and the peak value for the Strouhal number ratio of 1.0 was much higher than those for the steady cooling flow and the Strouhal number ratio of √2. When the absolute Reynolds shear stresses integrated for the mixing-layer region were compared, those for the Strouhal number ratios of 1.0 and √2 were found to be higher and lower, respectively, than those for the steady cooling flow. Remarkably, the suppression of the turbulent mixing for the Strouhal number ratio √2 was caused by the suppressed development of the large-scale alternating vortices shed from the lip edge by imposing the cooling-flow pulsation at the frequency nonresonant with the vortex shedding frequency of the steady cooling flow.
    publisherThe American Society of Mechanical Engineers (ASME)
    titlePulsating Film-Cooling Flow Over Smooth Cutback Surface at Airfoil Trailing Edge Measured by 2D3C-PTV
    typeJournal Paper
    journal volume143
    journal issue9
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4051669
    journal fristpage092101-1
    journal lastpage092101-9
    page9
    treeJournal of Heat Transfer:;2021:;volume( 143 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian