Impact of Film-Cooling Jets on Turbine Aerodynamic Losses

[+] Author and Article Information
Dibbon K. Walters, James H. Leylek

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634

J. Turbomach 122(3), 537-545 (Feb 01, 1999) (9 pages) doi:10.1115/1.1303818 History: Received February 01, 1999
Copyright © 2000 by ASME
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Geometry of the experimental test case used in this study: (a) overall setup; (b) blading details. Computational domain modeled the experiments (Ito et al., 1980).
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Details of the SS grid used in the present study: (a) z=0 symmetry plane; (b) surface mesh in film-hole region
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Solid blade loading curve indicates good agreement between computations and experiments
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Profiles of loss coefficient for the solid blade obtained with each of the turbulence models. The RSM and RKE models yield the best agreement with experiments.
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Contours of turbulent kinetic energy normalized by average exit velocity (k/V22), showing excess turbulence computed with SKE and RNG models
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Pitchwise-averaged downstream loss coefficient for SS injection: (a) overall; (b) increase due to film cooling
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Profiles of downstream loss coefficient for SS injection
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Pitchwise-averaged downstream loss coefficient for PS injection: (a) overall; (b) increase due to film cooling
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Effect of density ratio on area-averaged loss coefficient for SS injection. Significant influence is observed when plotted versus M(a), but not when plotted versus I(b).




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