The combined effects of a favorable, mainstream pressure gradient and coolant-to-mainstream density ratio have been investigated. Detailed film cooling effectiveness distributions have been obtained on a flat plate with either cylindrical (θ = 30°) or laidback, fan-shaped holes (θ = 30°, β = γ = 10°) using the pressure sensitive paint (PSP) technique. In a low speed wind tunnel, both non-accelerating and accelerating flows were considered while the density ratio varied from 1–4. In addition, the effect of blowing ratio was considered, with this ratio varying from 0.5 to 1.5. The film produced by the shaped hole outperformed the round hole under the presence of a favorable pressure gradient for all blowing and density ratios. At the lowest blowing ratio, in the absence of freestream acceleration, the round holes outperformed the shaped holes. However, as the blowing ratio increases, the shaped holes prevent lift-off of the coolant and offer enhanced protection. The effectiveness afforded by both the cylindrical and shaped holes, with and without freestream acceleration, increased with density ratio.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4980-4
PROCEEDINGS PAPER
Combined Effects of Freestream Pressure Gradient and Density Ratio on the Film Cooling Effectiveness of Round and Shaped Holes on a Flat Plate
Kyle R. Vinton,
Kyle R. Vinton
Baylor University, Waco, TX
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Travis B. Watson,
Travis B. Watson
Baylor University, Waco, TX
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Lesley M. Wright,
Lesley M. Wright
Baylor University, Waco, TX
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Daniel C. Crites,
Daniel C. Crites
Honeywell Aerospace, Phoenix, AZ
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Mark C. Morris,
Mark C. Morris
Honeywell Aerospace, Phoenix, AZ
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Ardeshir Riahi
Ardeshir Riahi
Honeywell Aerospace, Phoenix, AZ
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Kyle R. Vinton
Baylor University, Waco, TX
Travis B. Watson
Baylor University, Waco, TX
Lesley M. Wright
Baylor University, Waco, TX
Daniel C. Crites
Honeywell Aerospace, Phoenix, AZ
Mark C. Morris
Honeywell Aerospace, Phoenix, AZ
Ardeshir Riahi
Honeywell Aerospace, Phoenix, AZ
Paper No:
GT2016-56210, V05CT19A009; 11 pages
Published Online:
September 20, 2016
Citation
Vinton, KR, Watson, TB, Wright, LM, Crites, DC, Morris, MC, & Riahi, A. "Combined Effects of Freestream Pressure Gradient and Density Ratio on the Film Cooling Effectiveness of Round and Shaped Holes on a Flat Plate." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 5C: Heat Transfer. Seoul, South Korea. June 13–17, 2016. V05CT19A009. ASME. https://doi.org/10.1115/GT2016-56210
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