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A comparative analysis of various shaped film-cooling holes

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Abstract

In the present work, numerical analysis has been performed to investigate the film-cooling performance of various film-cooling hole schemes such as fan, crescent, louver, and dumbbell-shaped holes. To analyze the turbulent flow and the film-cooling mechanism, three-dimensional Reynolds-averaged Navier–Stokes analysis has been performed with the shear stress transport turbulence model. The validation of the numerical results for the film-cooling effectiveness has been performed in comparison with experimental data. The film-cooling performance for each hole shape has been evaluated in terms of the centerline, laterally averaged, and spatially averaged film-cooling effectiveness values. The dumbbell-shaped hole shows the best spatially averaged film-cooling effectiveness for all blowing ratios tested in this work.

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Abbreviations

D :

Film-cooling hole diameter

M :

Blowing ratio (=ρ j U j/ρ m U m)

R :

Radius

U :

Velocity (m/s)

ρ :

Density (kg/m3)

T :

Temperature (K)

η :

Film-cooling effectiveness

aw:

Adiabatic wall

m:

Main hot gas

s:

Spatially averaged value

j:

Coolant jet

c:

Centerline on the cooling surface

l:

Laterally averaged value

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Acknowledgments

This research was supported by the National Research Foundation of Korea (NRF) Grant No. 20090083510 funded by government (MEST) through the Multi-phenomena CFD Engineering Research Center.

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Correspondence to Kwang-Yong Kim.

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Kim, SM., Lee, KD. & Kim, KY. A comparative analysis of various shaped film-cooling holes. Heat Mass Transfer 48, 1929–1939 (2012). https://doi.org/10.1007/s00231-012-1043-5

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  • DOI: https://doi.org/10.1007/s00231-012-1043-5

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