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The effects of an embedded vortex on a film cooled turbulent boundary layer.

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Author
Joseph, Stephen Leo
Date
1986-12
Advisor
Ligrani, P.M.
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Abstract
This study was designed to model some of the secondary flow effects on endwalls, blades, and combustion chambers of gas turbine engines. Measurements were made in a turbulent boundary layer developing over a flat plate, using a single row of injection holes spaced three diameters apart inclined at 30 degrees with respect to horizontal. The hole diameter to boundary layer thickness ratio, non-dimensional injection temperatures, and blowing rates were the same as exist in turbine first stages. The injection system was designed to provide uniform injection temperatures for various blowing rates with discharge coefficients ranging from 0.58 to 0.73. The heat transfer surface was designed to provide constant heat flux with adjustable temperature range. Experimental heat transfer results were obtained with a turbulent boundary layer only, with boundary layer and injection of film cooling, with boundary layer and embedded vortex, and finally with boundary layer, film cooling, and embedded vortex. Results with a turbulent boundary layer only show excellent agreement with correlations accounting for unheated starting length. Results with film cooling only show expected trends, and results with embedded vortex only show excellent agreement with data from the literature. The effects of the vortex on heat transfer in the film cooled boundary layer are significant and important: (]) On the downwash side of the vortex, heat transfer is augmented, effects of the film cooling are negated and local "hot-spots" will exist in engines. (2) Near the upwash side of the vortex coolant is pushed to the side of the vortex, appearing to augment the protection provided by film cooling.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/21813
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  • 1. Thesis and Dissertation Collection, all items

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Showing items related by title, author, creator and subject.

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    Effects of an Embedded Vortex on Injectant from a Single Film-Cooling Hole in a Turbulent Boundary Layer 

    Ligrani, P.M.; William, W. (ASME, 1989);
    Effects of embedded longitudinal vortices on heat transfer in turbulent boundary layers with injection from a single film cooling hole are described. These results were obtained at a freestream velocity of 10 m/s, with a ...
  • Thumbnail

    Effects of an embedded vortex on a single film-cooling jet in a turbulent boundary layer 

    Williams, Warren W. (Monterey, California : Naval Postgraduate School, 1988-06);
    Effects of embedded longitudinal vortices on heat transfer in a turbulent boundary layer film cooled from a single injection hole are discussed. Film coolant was injected at blowing ratios 0.50 to 1.50 at a freestream velocity ...
  • Thumbnail

    Effect of vortex circulation on injectant from a single film-cooling hole and a row of film-cooling holes in a turbulent boundary layer, Part 2: injection beneath the vortex upwash 

    Kaisuwan, Pisut (Monterey, California. Naval Postgraduate School, 1989-12);
    Results are presented which illustrated the effects of single embedded longitudinal vortices on heat transfer and injectant downstream of a row of film-cooling holes and downstream of a single hole in a turbulent boundary ...
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