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    Investigation of Water Film Dynamics on the Surface of an Airfoil in a High-Speed Flow and Subsequent Ligament Formation and Breakup From the Trailing Edge

    Source: Journal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 004::page 41028-1
    Author:
    Safiullah, Safiullah
    ,
    McDonell, Vince
    ,
    Tabata, Soichiro
    ,
    Senoo, Shigeki
    ,
    Esquivias, Bradnon
    ,
    Hickey, Brendan
    DOI: 10.1115/1.4066993
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this work, the dynamics of a liquid film on the surface of NACA 0012 airfoil placed in a high-speed air flow is investigated. The findings complement previous results obtained on time averaged ligament behavior and droplet sizes generated by the same airfoil. Experimental studies were carried out to assess the film thickness, droplet shedding, and the dynamics of the sheet. In the present work, air velocities up to 175 m/s were used with water films flowing between 1.4 and 2.6 cm2/s. The water film was introduced onto one side of the airfoil surface through a series of 0.5 mm holes separated by 1 mm at a location 35 mm downstream of the leading edge of the vane. The results were obtained using four experimental tools. The first is a point measurement of the dynamic film thickness using a confocal laser induced fluorescence method. This spatially resolved measurement provides time resolved measurement of the instantaneous liquid film thickness at specific points on the vane surface. This is complimented by time averaged images of the film thickness on the entire vane surface. Third, high speed videos are obtained to study the accumulation and breakup of the liquid at the trailing edge of vane. Finally, laser diffraction and Phase Doppler interferometry were used to document the spray dynamics downstream of the vane. The results illustrate that the average film thickness decreases with air velocity and increases with the water flowrate. The results are consistent with the previous studies and suggest that the dominant frequency of liquid film wave, ligament breakup length, drop size and spray concentration increase with the air velocity and is modestly affected by water flowrate. Finally, design tools are provided to predict the average film thickness and dominant frequencies of the film thickness, ligament breakup, spray concentration and droplet average size.
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      Investigation of Water Film Dynamics on the Surface of an Airfoil in a High-Speed Flow and Subsequent Ligament Formation and Breakup From the Trailing Edge

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4306328
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    contributor authorSafiullah, Safiullah
    contributor authorMcDonell, Vince
    contributor authorTabata, Soichiro
    contributor authorSenoo, Shigeki
    contributor authorEsquivias, Bradnon
    contributor authorHickey, Brendan
    date accessioned2025-04-21T10:30:12Z
    date available2025-04-21T10:30:12Z
    date copyright12/11/2024 12:00:00 AM
    date issued2024
    identifier issn0742-4795
    identifier othergtp_147_04_041028.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306328
    description abstractIn this work, the dynamics of a liquid film on the surface of NACA 0012 airfoil placed in a high-speed air flow is investigated. The findings complement previous results obtained on time averaged ligament behavior and droplet sizes generated by the same airfoil. Experimental studies were carried out to assess the film thickness, droplet shedding, and the dynamics of the sheet. In the present work, air velocities up to 175 m/s were used with water films flowing between 1.4 and 2.6 cm2/s. The water film was introduced onto one side of the airfoil surface through a series of 0.5 mm holes separated by 1 mm at a location 35 mm downstream of the leading edge of the vane. The results were obtained using four experimental tools. The first is a point measurement of the dynamic film thickness using a confocal laser induced fluorescence method. This spatially resolved measurement provides time resolved measurement of the instantaneous liquid film thickness at specific points on the vane surface. This is complimented by time averaged images of the film thickness on the entire vane surface. Third, high speed videos are obtained to study the accumulation and breakup of the liquid at the trailing edge of vane. Finally, laser diffraction and Phase Doppler interferometry were used to document the spray dynamics downstream of the vane. The results illustrate that the average film thickness decreases with air velocity and increases with the water flowrate. The results are consistent with the previous studies and suggest that the dominant frequency of liquid film wave, ligament breakup length, drop size and spray concentration increase with the air velocity and is modestly affected by water flowrate. Finally, design tools are provided to predict the average film thickness and dominant frequencies of the film thickness, ligament breakup, spray concentration and droplet average size.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInvestigation of Water Film Dynamics on the Surface of an Airfoil in a High-Speed Flow and Subsequent Ligament Formation and Breakup From the Trailing Edge
    typeJournal Paper
    journal volume147
    journal issue4
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4066993
    journal fristpage41028-1
    journal lastpage41028-11
    page11
    treeJournal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 004
    contenttypeFulltext
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