Effect of Mainstream Velocity on the Optimization of a Fan-Shaped Film-Cooling Hole on a Flat Plate

Soo In Lee, Jin Young Jung, Yu Jin Song and Jae Su Kwak
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Soo In Lee: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Jin Young Jung: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Yu Jin Song: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea
Jae Su Kwak: School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea

Energies, 2021, vol. 14, issue 12, 1-15

Abstract: In this study, the effect of mainstream velocity on the optimization of a fan-shaped hole on a flat plate was experimentally investigated. The experiment was conducted by changing the forward expansion angle ( β fwd ), lateral expansion angle ( β lat ), and metering length ratio ( L m / D ) of the film-cooling hole. A total of 13 cases extracted using the Box–Behnken method were considered to examine the effect of the shape parameters of the film-cooling hole under a 90 m/s mainstream velocity condition, and the results were compared with the results derived under a mainstream velocity of 20 m/s. One density ratio (DR = 2.0) and a blowing ratio (M) ranging from 1.0 to 2.5 were considered, and the pressure-sensitive paint (PSP) technique was applied for the film-cooling effectiveness (FCE). As a result of the experiment, the optimized hole showed a 49.3% improvement in the overall averaged FCE compared to the reference hole with DR = 2.0 and M = 2.0. As the blowing ratio increased, the hole exit area tended to increase, and this tendency was the same as that in the 20 m/s mainstream condition.

Keywords: fan-shaped hole; film cooling; gas turbine; shape optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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