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TECHNICAL PAPERS

Aerodynamic Loss Characteristics of a Turbine Blade With Trailing Edge Coolant Ejection: Part 2—External Aerodynamics, Total Pressure Losses, and Predictions

[+] Author and Article Information
Oguz Uzol, Cengiz Camci

Turbomachinery Heat Transfer Laboratory, The Pennsylvania State University, University Park, PA 16802

J. Turbomach 123(2), 249-257 (Feb 01, 2000) (9 pages) doi:10.1115/1.1351817 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Deckers, M., and Denton, J. D., 1997, “The Aerodynamics of Trailing-Edge-Cooled Transonic Turbine Blades: Part 1—Experimental Approach,” ASME Paper No. 97-GT-518.
Pappu, K. R., and Schobeiri, M. T., 1997, “Optimization of Trailing Edge Ejection Mixing Losses: A Theoretical and Experimental Study,” ASME Paper No. 97-GT-523.
Sieverding,  C. H., Arts,  T., Dénos,  R., and Martelli,  F., 1996, “Investigation of the Flow Field Downstream of a Turbine Trailing Edge Cooled Nozzle Guide Vane,” ASME J. Turbomach., 118, pp. 291–300.
Mee, D. J., 1992, “`Techniques for Aerodynamic Loss Measurement of Transonic Turbine Cascades With Trailing-Edge Region Coolant Ejection,” ASME Paper No. 92-GT-157.
Kost, F. H., and Holmes, A. T., 1985, “Aerodynamic Effect of Coolant Ejection in the Rear Part of Transonic Rotor Blades,” in: Heat Transfer and Cooling in Gas Turbines, AGARD Conference Proceedings No. 390, pp. 41-1–41-12.
Kapteijn,  C., Amecke,  J., and Michelassi,  V., 1996, “Aerodynamic Performance of a Transonic Turbine Guide Vane With Trailing Edge Coolant Ejection: Part 1—Experimental Approach,” ASME J. Turbomach., 118, pp. 519–528.
Uzol,  O., Camci,  C., and Glezer,  B., 2001, “Aerodynamic Loss Characteristics of a Turbine Blade With Trailing Edge Coolant Ejection: Part 1—Effect of Cut-Back Length, Spanwise Rib Spacing, Free-Stream Reynolds Number, and Chordwise Rib Length on Discharge Coefficients,” ASME J. Turbomach., 123, pp. 238–248.
Gaugler, R. E., and Russell, L. M., 1980, “Streakline Flow Visualization Study of a Horseshoe Vortex in a Large-Scale, Two-Dimensional Turbine Stator Cascade,” ASME Paper No. 80-GT-4.
Hippensteele, S. A., Russell, L. M., and Torres, F. J., 1995, “Local Heat Transfer Measurements on a Large, Scale-Model Turbine Blade Airfoil Using a Composite of a Heater Element and Liquid Crystals,” NASA TM 86900.
Kim, J. H., Kim, T. S., Lee, J. S., and Ro, S. T., 1996, “Performance Analysis of a Turbine Stage Having Cooled Nozzle Blades With Trailing Edge Ejection,” ASME Paper No. 96-TA-12.
Launder, B. E., 1993, “Lecture Notes on Turbulence Modeling in Industrial Flows,” Les Houches Summer School on Computational Fluid Dynamics; also in FIDAP, 1993.
Fluid Dynamics International, Inc., 1993, FIDAP 7.0 Users’ Manual.

Figures

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Trailing edge coolant ejection configurations
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Typical speckle images for PIV measurements (Blade A)
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Variation of the mean velocity inside the wake with number of samples
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Measured PIV speed contours at Remax=350.000
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Measured PIV speed contours at Remax=500,000
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Measured velocity profiles inside the wake along line AA
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Effect of cut-back length on wake velocity defect (0 percent ejection rate)
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Measured total pressure loss profiles along line AA
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Computational meshes for Blades A and B
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Speed contours and turbulent kinetic energy contours for Blade A
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Speed contours and turbulent kinetic energy contours for Blade B

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