High freestream turbulence effects on endwall heat transfer for a gas turbine stator vane

R. W. Radomsky, Karen Ann Thole

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

    8 Scopus citations

    Abstract

    High freestream turbulence along a gas turbine airfoil and strong secondary flows along the endwall have both been reported to significantly increase convective heat transfer. This study superimposes high freestream turbulence on the naturally occurring secondary flow vortices to determine the effects on the flowfield and the endwall convective heat transfer. Measured flowfield and heat transfer data were compared between low freestream turbulence levels (0.6%) and combustor simulated turbulence levels (19.5%) that were generated using an active grid. These experiments were conducted using a scaled-up, first stage stator vane geometry. Infrared thermography was used to measure surface temperatures on a constant heat flux plate placed on the endwall surface. Laser Doppler velocimeter (LDV) measurements were performed of all three components of the mean and fluctuating velocities of the leading edge horseshoe vortex. The results indicate that the mean flowfields for the leading edge horseshoe vortex were similar between the low and high freestream turbulence cases. High turbulence levels in the leading edge-endwall juncture were attributed to a vortex unsteadiness for both the low and high freestream tubulence cases. While, in general, the high freestream turbulence increased the endwall heat transfer, low augmentations were found to coincide with the regions having the most intense vortex motions.

    Original languageEnglish (US)
    Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791878569, 9780791878569
    DOIs
    StatePublished - Jan 1 2000
    EventASME Turbo Expo 2000: Power for Land, Sea, and Air, GT 2000 - Munich, Germany
    Duration: May 8 2000May 11 2000

    Publication series

    NameProceedings of the ASME Turbo Expo
    Volume3

    Other

    OtherASME Turbo Expo 2000: Power for Land, Sea, and Air, GT 2000
    CountryGermany
    CityMunich
    Period5/8/005/11/00

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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  • Cite this

    Radomsky, R. W., & Thole, K. A. (2000). High freestream turbulence effects on endwall heat transfer for a gas turbine stator vane. In Heat Transfer; Electric Power; Industrial and Cogeneration (Proceedings of the ASME Turbo Expo; Vol. 3). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/2000-GT-0201