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    A Transient Infrared Thermography Method for Simultaneous Film Cooling Effectiveness and Heat Transfer Coefficient Measurements From a Single Test

    Source: Journal of Turbomachinery:;2004:;volume( 126 ):;issue: 004::page 597
    Author:
    Srinath V. Ekkad
    ,
    Shichuan Ou
    ,
    Richard B. Rivir
    DOI: 10.1115/1.1791283
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In film cooling situations, there is a need to determine both local adiabatic wall temperature and heat transfer coefficient to fully assess the local heat flux into the surface. Typical film cooling situations are termed three temperature problems where the complex interaction between the jets and mainstream dictates the surface temperature. The coolant temperature is much cooler than the mainstream resulting in a mixed temperature in the film region downstream of injection. An infrared thermography technique using a transient surface temperature acquisition is described which determines both the heat transfer coefficient and film effectiveness (nondimensional adiabatic wall temperature) from a single test. Hot mainstream and cooler air injected through discrete holes are imposed suddenly on an ambient temperature surface and the wall temperature response is captured using infrared thermography. The wall temperature and the known mainstream and coolant temperatures are used to determine the two unknowns (the heat transfer coefficient and film effectiveness) at every point on the test surface. The advantage of this technique over existing techniques is the ability to obtain the information using a single transient test. Transient liquid crystal techniques have been one of the standard techniques for determining h and η for turbine film cooling for several years. Liquid crystal techniques do not account for nonuniform initial model temperatures while the transient IR technique measures the entire initial model distribution. The transient liquid crystal technique is very sensitive to the angle of illumination and view while the IR technique is not. The IR technique is more robust in being able to take measurements over a wider temperature range which improves the accuracy of h and η. The IR requires less intensive calibration than liquid crystal techniques. Results are presented for film cooling downstream of a single hole on a turbine blade leading edge model.
    keyword(s): Temperature , Cooling , Liquid crystals , Measurement , Thermography , Coolants , Heat transfer coefficients , Wall temperature AND Heat flux ,
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      A Transient Infrared Thermography Method for Simultaneous Film Cooling Effectiveness and Heat Transfer Coefficient Measurements From a Single Test

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/130961
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    • Journal of Turbomachinery

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    contributor authorSrinath V. Ekkad
    contributor authorShichuan Ou
    contributor authorRichard B. Rivir
    date accessioned2017-05-09T00:14:39Z
    date available2017-05-09T00:14:39Z
    date copyrightOctober, 2004
    date issued2004
    identifier issn0889-504X
    identifier otherJOTUEI-28715#597_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/130961
    description abstractIn film cooling situations, there is a need to determine both local adiabatic wall temperature and heat transfer coefficient to fully assess the local heat flux into the surface. Typical film cooling situations are termed three temperature problems where the complex interaction between the jets and mainstream dictates the surface temperature. The coolant temperature is much cooler than the mainstream resulting in a mixed temperature in the film region downstream of injection. An infrared thermography technique using a transient surface temperature acquisition is described which determines both the heat transfer coefficient and film effectiveness (nondimensional adiabatic wall temperature) from a single test. Hot mainstream and cooler air injected through discrete holes are imposed suddenly on an ambient temperature surface and the wall temperature response is captured using infrared thermography. The wall temperature and the known mainstream and coolant temperatures are used to determine the two unknowns (the heat transfer coefficient and film effectiveness) at every point on the test surface. The advantage of this technique over existing techniques is the ability to obtain the information using a single transient test. Transient liquid crystal techniques have been one of the standard techniques for determining h and η for turbine film cooling for several years. Liquid crystal techniques do not account for nonuniform initial model temperatures while the transient IR technique measures the entire initial model distribution. The transient liquid crystal technique is very sensitive to the angle of illumination and view while the IR technique is not. The IR technique is more robust in being able to take measurements over a wider temperature range which improves the accuracy of h and η. The IR requires less intensive calibration than liquid crystal techniques. Results are presented for film cooling downstream of a single hole on a turbine blade leading edge model.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Transient Infrared Thermography Method for Simultaneous Film Cooling Effectiveness and Heat Transfer Coefficient Measurements From a Single Test
    typeJournal Paper
    journal volume126
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.1791283
    journal fristpage597
    journal lastpage603
    identifier eissn1528-8900
    keywordsTemperature
    keywordsCooling
    keywordsLiquid crystals
    keywordsMeasurement
    keywordsThermography
    keywordsCoolants
    keywordsHeat transfer coefficients
    keywordsWall temperature AND Heat flux
    treeJournal of Turbomachinery:;2004:;volume( 126 ):;issue: 004
    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
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