Simulations of Multiphase Particle Deposition on Endwall Film-Cooling Holes in Transverse Trenches

Seth A. Lawson, Karen Ann Thole

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    Integrated gasification combined cycle (IGCC) power plants allow for increased efficiency and reduced emissions as compared to pulverized coal plants. A concern with IGCCs is that impurities in the fuel from the gasification of coal can deposit on turbine components reducing the performance of sophisticated film-cooling geometries. Studies have shown that recessing a row of film-cooling holes in a transverse trench can improve cooling performance; however, the question remains as to whether or not these improvements exist in severe environments such as when particle deposition occurs. Dynamic simulations of deposition were completed using wax injection in a large-scale vane cascade with endwall film cooling. Endwall cooling effectiveness was quantified in two specific endwall locations using trenches with depths of 0.4D, 0.8D, and 1.2D, where D is the diameter of a film-cooling hole. The effects of trench depth, momentum flux ratio, and particle phase on adiabatic effectiveness were quantified using infrared thermography. Results showed that the 0.8D trench outperformed other geometries with and without deposition on the surface. Deposition of particles reduced the cooling effectiveness by as much as 15% at I = 0.23 with the trenched holes as compared to 30% for holes that were not placed in a transverse trench.

    Original languageEnglish (US)
    Article number051040
    JournalJournal of Turbomachinery
    Volume134
    Issue number5
    DOIs
    StatePublished - Jun 5 2012

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    Cooling
    Gasification
    Coal deposits
    Turbine components
    Combined cycle power plants
    Geometry
    Waxes
    Momentum
    Coal
    Impurities
    Fluxes
    Computer simulation

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering

    Cite this

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    abstract = "Integrated gasification combined cycle (IGCC) power plants allow for increased efficiency and reduced emissions as compared to pulverized coal plants. A concern with IGCCs is that impurities in the fuel from the gasification of coal can deposit on turbine components reducing the performance of sophisticated film-cooling geometries. Studies have shown that recessing a row of film-cooling holes in a transverse trench can improve cooling performance; however, the question remains as to whether or not these improvements exist in severe environments such as when particle deposition occurs. Dynamic simulations of deposition were completed using wax injection in a large-scale vane cascade with endwall film cooling. Endwall cooling effectiveness was quantified in two specific endwall locations using trenches with depths of 0.4D, 0.8D, and 1.2D, where D is the diameter of a film-cooling hole. The effects of trench depth, momentum flux ratio, and particle phase on adiabatic effectiveness were quantified using infrared thermography. Results showed that the 0.8D trench outperformed other geometries with and without deposition on the surface. Deposition of particles reduced the cooling effectiveness by as much as 15{\%} at I = 0.23 with the trenched holes as compared to 30{\%} for holes that were not placed in a transverse trench.",
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    Simulations of Multiphase Particle Deposition on Endwall Film-Cooling Holes in Transverse Trenches. / Lawson, Seth A.; Thole, Karen Ann.

    In: Journal of Turbomachinery, Vol. 134, No. 5, 051040, 05.06.2012.

    Research output: Contribution to journalArticle

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