Film-cooling flowfields with trenched holes on an endwall

N. Sundaram, Karen Ann Thole

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

    5 Citations (Scopus)

    Abstract

    The leading edge region along the endwall of a stator vane experiences high heat transfer rates resulting from the formation of horseshoe vortices. Typical gas turbine endwall designs include a leakage slot at the combustor-turbine interface as well as film-cooling holes. Past studies have documented the formation of a horseshoe vortex at the leading edge of a vane, but few studies have documented the flowfield in the presence of an interface slot and film-cooling jets. In this paper, a series of flowfield measurements are evaluated at the leading edge with configurations including: a baseline with neither film-cooling holes nor an upstream slot, a row of film-cooling holes and an interface slot, and a row of film-cooling holes in a trench and an interface slot. The results indicated the formation of a second vortex present for the case with film-cooling holes and a slot relative to the baseline study. In addition, turbulence intensity levels as high as 50% were measured at the leading edge with film-cooling holes and a slot compared to the 30% measured for the baseline study. A trench was shown to provide improved overall cooling relative to the no trench configuration as more of the coolant stayed attached to the endwall surface with the trench.

    Original languageEnglish (US)
    Title of host publication2008 Proceedings of the ASME Turbo Expo
    Subtitle of host publicationPower for Land, Sea, and Air
    Pages121-132
    Number of pages12
    Volume4
    EditionPART A
    DOIs
    StatePublished - Dec 1 2008
    Event2008 ASME Turbo Expo - 2008 ASME Turbo Expo, Germany
    Duration: Jun 9 2008Jun 13 2008

    Other

    Other2008 ASME Turbo Expo
    CountryGermany
    City2008 ASME Turbo Expo
    Period6/9/086/13/08

    Fingerprint

    Cooling
    Vortex flow
    Combustors
    Coolants
    Stators
    Gas turbines
    Turbulence
    Turbines
    Heat transfer

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Cite this

    Sundaram, N., & Thole, K. A. (2008). Film-cooling flowfields with trenched holes on an endwall. In 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air (PART A ed., Vol. 4, pp. 121-132) https://doi.org/10.1115/GT2008-50149
    Sundaram, N. ; Thole, Karen Ann. / Film-cooling flowfields with trenched holes on an endwall. 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air. Vol. 4 PART A. ed. 2008. pp. 121-132
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    abstract = "The leading edge region along the endwall of a stator vane experiences high heat transfer rates resulting from the formation of horseshoe vortices. Typical gas turbine endwall designs include a leakage slot at the combustor-turbine interface as well as film-cooling holes. Past studies have documented the formation of a horseshoe vortex at the leading edge of a vane, but few studies have documented the flowfield in the presence of an interface slot and film-cooling jets. In this paper, a series of flowfield measurements are evaluated at the leading edge with configurations including: a baseline with neither film-cooling holes nor an upstream slot, a row of film-cooling holes and an interface slot, and a row of film-cooling holes in a trench and an interface slot. The results indicated the formation of a second vortex present for the case with film-cooling holes and a slot relative to the baseline study. In addition, turbulence intensity levels as high as 50{\%} were measured at the leading edge with film-cooling holes and a slot compared to the 30{\%} measured for the baseline study. A trench was shown to provide improved overall cooling relative to the no trench configuration as more of the coolant stayed attached to the endwall surface with the trench.",
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    Sundaram, N & Thole, KA 2008, Film-cooling flowfields with trenched holes on an endwall. in 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air. PART A edn, vol. 4, pp. 121-132, 2008 ASME Turbo Expo, 2008 ASME Turbo Expo, Germany, 6/9/08. https://doi.org/10.1115/GT2008-50149

    Film-cooling flowfields with trenched holes on an endwall. / Sundaram, N.; Thole, Karen Ann.

    2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air. Vol. 4 PART A. ed. 2008. p. 121-132.

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

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    Sundaram N, Thole KA. Film-cooling flowfields with trenched holes on an endwall. In 2008 Proceedings of the ASME Turbo Expo: Power for Land, Sea, and Air. PART A ed. Vol. 4. 2008. p. 121-132 https://doi.org/10.1115/GT2008-50149