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TECHNICAL PAPERS

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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References

Ito, S., 1976, “Film Cooling and Aerodynamic Loss in a Gas Turbine Cascade,” Ph.D. Thesis, University of Minnesota.
Ito,  S., Eckert,  E. R., and Goldstein,  R. J., 1980, “Aerodynamic Loss in a Gas Turbine Stage With Film-Cooling,” ASME J. Eng. Power, 102, pp. 964–970.
Haller,  B. R., and Camus,  J.-J., 1984, “Aerodynamic Loss Penalty Produced by Film Cooling Transonic Turbine Blades,” ASME J. Eng. Gas Turbines Power, 106, pp. 198–205.
Köllen, O., and Koschel, W., 1985, “Effect of Film Cooling on the Aerodynamic Performance of a Turbine Cascade,” AGARD CP-390.
Yamamoto,  A., Kondo,  Y., and Murao,  R., 1991, “Cooling-Air Injection Into Secondary Flow and Loss Fields Within a Linear Turbine Cascade,” ASME J. Turbomach., 113, pp. 375–383.
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Figures

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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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