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    Evaluation of Superposition Predictions for Showerhead Film Cooling on a Vane

    Source: Journal of Turbomachinery:;2015:;volume( 137 ):;issue: 004::page 41010
    Author:
    Anderson, Joshua B.
    ,
    Winka, James R.
    ,
    Bogard, David G.
    ,
    Crawford, Michael E.
    DOI: 10.1115/1.4028708
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The leading edge of a turbine vane is subject to some of the highest temperature loading within an engine, and an accurate understanding of leading edge film coolant behavior is essential for modern engine design. Although there have been many investigations of the adiabatic effectiveness for showerhead film cooling of a vane leading edge region, there have been no previous studies in which individual rows of the showerhead were tested with the explicit intent of validating superposition models. For the current investigation, a series of adiabatic effectiveness experiments were performed with a fiverow and threerow showerhead. The experiments were repeated separately with each individual row of holes active. This allowed evaluation of superposition methods on both the suction side of the vane, which was moderately convex, and the pressure side of the vane, which was mildly concave. Superposition was found to accurately predict performance on the suction side of the vane at lower momentum flux ratios, but not at higher momentum flux ratios. On the pressure side of the vane, the superposition predictions were consistently lower than measured values, with significant errors occurring at the higher momentum flux ratios. Reasons for the underprediction by superposition analysis are presented.
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      Evaluation of Superposition Predictions for Showerhead Film Cooling on a Vane

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    http://yetl.yabesh.ir/yetl1/handle/yetl/159913
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    contributor authorAnderson, Joshua B.
    contributor authorWinka, James R.
    contributor authorBogard, David G.
    contributor authorCrawford, Michael E.
    date accessioned2017-05-09T01:24:30Z
    date available2017-05-09T01:24:30Z
    date issued2015
    identifier issn0889-504X
    identifier otherturbo_137_04_041010.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/159913
    description abstractThe leading edge of a turbine vane is subject to some of the highest temperature loading within an engine, and an accurate understanding of leading edge film coolant behavior is essential for modern engine design. Although there have been many investigations of the adiabatic effectiveness for showerhead film cooling of a vane leading edge region, there have been no previous studies in which individual rows of the showerhead were tested with the explicit intent of validating superposition models. For the current investigation, a series of adiabatic effectiveness experiments were performed with a fiverow and threerow showerhead. The experiments were repeated separately with each individual row of holes active. This allowed evaluation of superposition methods on both the suction side of the vane, which was moderately convex, and the pressure side of the vane, which was mildly concave. Superposition was found to accurately predict performance on the suction side of the vane at lower momentum flux ratios, but not at higher momentum flux ratios. On the pressure side of the vane, the superposition predictions were consistently lower than measured values, with significant errors occurring at the higher momentum flux ratios. Reasons for the underprediction by superposition analysis are presented.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleEvaluation of Superposition Predictions for Showerhead Film Cooling on a Vane
    typeJournal Paper
    journal volume137
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4028708
    journal fristpage41010
    journal lastpage41010
    identifier eissn1528-8900
    treeJournal of Turbomachinery:;2015:;volume( 137 ):;issue: 004
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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