Blockage effects from simulated thermal barrier coatings for cylindrical and shaped cooling holes

Christopher A. Whitfield, Robert P. Schroeder, Karen Ann Thole, Scott D. Lewis

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Scopus citations

    Abstract

    Film cooling and sprayed thermal barrier coatings (TBCs) protect gas turbine components from the hot combustion gas temperatures. As gas turbine designers pursue higher turbine inlet temperatures, film cooling and thermal barrier coatings are critical in protecting the durability of turbomachinery hardware. One obstacle to the synergy of these technologies is that TBC coatings can block cooling holes when applied to the components, causing a decrease in the film cooling flow area thereby reducing coolant flow for a given pressure ratio. In this study the effect of TBC blockages was simulated on film cooling holes for widely spaced cylindrical and shaped holes. At low blowing ratios for shaped holes the blockages were found to have very little effect on adiabatic effectiveness. At high blowing ratios, the area-averaged effectiveness of shaped and cylindrical holes decreased as much as 75% from blockage. The decrease in area-averaged effectiveness was found to scale best with the effective momentum flux ratio of the jet exiting the film cooling hole for the shaped holes.

    Original languageEnglish (US)
    Title of host publicationHeat Transfer
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791845721
    DOIs
    Publication statusPublished - Jan 1 2014
    EventASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 - Dusseldorf, Germany
    Duration: Jun 16 2014Jun 20 2014

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume5B

    Other

    OtherASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014
    CountryGermany
    CityDusseldorf
    Period6/16/146/20/14

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    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Whitfield, C. A., Schroeder, R. P., Thole, K. A., & Lewis, S. D. (2014). Blockage effects from simulated thermal barrier coatings for cylindrical and shaped cooling holes. In Heat Transfer (Proceedings of the ASME Turbo Expo; Vol. 5B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2014-25576