A numerical study has been conducted to investigate the effects of surface curvature on cooling effectiveness using three-dimensional film cooling geometries that included the mainflow, injection hole, and supply plenum regions. Three surfaces were considered in this study, namely, convex, concave, and flat surfaces. The fully elliptic, three-dimensional Navier-Stokes equations were solved over a body-fitted grid. The effects of streamline curvature were taken into account by using algebraic relations for the turbulent viscosity and the turbulent Prandtl number in a modified k-ε turbulence model. Computations were performed for blowing ratios of 0.5, 1.0, and 1.5 at a density ratio of 2.0. The computed and experimental cooling effectiveness results were compared. For the most part, the cooling effectiveness was predicted quite well. A comparison of the cooling performances over the three surfaces reveals that the effect of streamline curvature on cooling effectiveness is very significant. For the low blowing ratios considered, the convex surface resulted in a higher cooling effectiveness than both the flat and concave surfaces. The flow structures over the three surfaces also exhibited important differences. On the concave surface, the flow involved a stronger vorticity and greater mixing of the coolant jet with the mainstream gases. On the convex surface, the counter-rotating vortices were suppressed and the coolant jet pressed to the surface by a strong cross-stream pressure gradient.
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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
June 2–5, 1998
Stockholm, Sweden
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7865-1
PROCEEDINGS PAPER
Curvature Effects on Discrete-Hole Film Cooling
Mulugeta K. Berhe,
Mulugeta K. Berhe
University of Minnesota, Minneapolis, MN
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Suhas V. Patankar
Suhas V. Patankar
University of Minnesota, Minneapolis, MN
Search for other works by this author on:
Mulugeta K. Berhe
University of Minnesota, Minneapolis, MN
Suhas V. Patankar
University of Minnesota, Minneapolis, MN
Paper No:
98-GT-373, V004T09A068; 13 pages
Published Online:
December 23, 2014
Citation
Berhe, MK, & Patankar, SV. "Curvature Effects on Discrete-Hole Film Cooling." Proceedings of the ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration. Stockholm, Sweden. June 2–5, 1998. V004T09A068. ASME. https://doi.org/10.1115/98-GT-373
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