Abstract
Film cooling experiments were performed using a highly loaded high pressure turbine blade blade linear cascade. A large region with main flow separation is found on the pressure side and film cooling is provided into this area with three rows of either cylindrical or fan-shaped holes. The measurements comprise adiabatic film cooling effectiveness and profile static pressure measurements. The surface temperature was acquired with thermochromatic liquid crystals and using a hue to temperature correlation. The results shown are for variations in main flow Mach and Reynolds numbers at engine relevant levels and of coolant mass flows. The results for steady and periodic unsteady inflows with highly turbulent wakes created by cylindrical bars moving upstream in a plane parallel to the cascade are compared as two-dimensional surface plots, laterally averaged film cooling effectiveness and overall effectiveness over the entire surface.
Issue Section:
Research
Papers
1.
Bunker
, R. S.
, 2007, “Gas Turbine Heat Transfer: Ten Remaining Hot Gas Path Challenges
,” ASME J. Turbomach.
0889-504X, 129
, pp. 193
–201
.2.
Deinert
, M.
, and Hourmouziadis
, J.
, 2004, “Film Cooling in Separated Flow With Separation Bubble
,” ASME
Paper No. GT2004-53075.3.
Homeier
, L.
, and Haselbach
, F.
, 2005, “Film Cooling of Highly Loaded Blades
,” Proceedings of the XVII International Symposium on Air Breathing Engines (ISABE)
, Munich, Germany, Paper No. ISABE-2005-1114.4.
Ou
, S.
, and Han
, J. C.
, 1994, “Unsteady Wake Effect on Film Effectiveness and Heat Transfer Coefficient From a Turbine Blade With One Row of Air and CO2 Film Injection
,” ASME J. Heat Transfer
0022-1481, 116
, pp. 921
–928
.5.
Du
, H.
, Han
, J. -C.
, and Ekkad
, S. V.
, 1997, “Effect of Unsteady Wake on Detailed Heat Transfer Coefficient and Film Effectiveness Distributions for a Gas Turbine Blade
,” ASME Paper No. 97-GT-166.6.
Heidmann
, J. D.
, Lucci
, B. L.
, and Reshotko
, E.
, 1997, “An Experimental Study of the Effect of Wake Passing on Turbine Blade Film Cooling
,” ASME Paper No. 97-GT-255.7.
Abhari
, R.
, 1996, “Impact of Rotor-Stator Interaction on Turbine Blade Film Cooling
,” ASME J. Turbomach.
0889-504X, 118
, pp. 123
–133
.8.
Ekkad
, S. V.
, Han
, J. C.
, and Du
, H.
, 1997, “Detailed Film Cooling Measurements on a Cylindrical Leading Edge Model: Effect of Free-Stream Turbulence and Coolant Density
,” ASME
Paper No. 97-GT-181.9.
Drost
, U.
, and Bölcs
, A.
, 1998, “Investigation of Detailed Film Cooling Effectiveness and Heat Transfer Distributions on a Gas Turbine Airfoil
,” ASME
Paper No. 98-GT-20.10.
Colban
, W.
, Gratton
, A.
, Thole
, K.
, and Haendler
, M.
, 2006, “Heat Transfer and Film-Cooling Measurements on a Stator Vane With Fan-Shaped Cooling Holes
,” ASME J. Turbomach.
0889-504X, 128
, pp. 53
–61
.11.
Polanka
, M.
, Ethridge
, M.
, Cutbirth
, J.
, and Bogard
, D.
, 2000, “Effects of Showerhead Injection on Film-Cooling Effectiveness for a Downstream Row of Holes
,” ASME
Paper No. 2000-GT-240.12.
Zhang
, L.
, and Moon
, H. -K.
, 2007, “Turbine Blade Film Cooling Study—The Effects of Film Hole Location on the Pressure Side
,” ASME Paper No. GT2007-27546.13.
Coulthard
, S. M.
, Volino
, R. J.
, and Flack
, K. A.
, 2007, “Effect of Jet Pulsing on Film Cooling—Part I: Effectiveness and Flow-Field Temperature Results
,” ASME J. Turbomach.
0889-504X, 129
(2
), pp. 232
–246
.14.
Womack
, K. M.
, Volino
, R. J.
, and Schultz
, M. P.
, 2007, “Measurements in Film Cooling Flows With Periodic Wakes
,” ASME Paper No. GT2007-27917.15.
Sturm
, W.
, and Fottner
, L.
, 1985, “The High-Speed Cascade Wind-Tunnel of the German Armed Forces University Munich
,” Eighth Symposium on Measuring Techniques for Transonic and Supersonic Flows in Cascades and Turbomachines
, Genova, Italy, Oct. 24–25.16.
Acton
, P.
, and Fottner
, L.
, 1996, “The Generation of Instationary Flow Conditions in the High-Speed Cascade Wind Tunnel of the German Armed Forces University Munich
,” 13th Symposium on Measuring Techniques
, Zurich, Switzerland.17.
Eckert
, E.
, 1984, “Analysis of Film Cooling and Full-Coverage Film Cooling of Gas Turbines and Blades
,” ASME J. Eng. Gas Turbines Power
0742-4795, 106
, pp. 206
–213
.18.
Dannhauer
, A.
, 2002, “Heat Transfer Measurements on a Sidewall and Blade Surface of a Large Scale NGV With Leakage Flow
,” 16th Symposium on Measuring Techniques in Transonic and Supersonic Flow in Cascades and Turbomachines
, Cambridge, UK.19.
Hale
, J.
, Diller
, T.
, and Ng
, W.
, 1997, “Effects of a Wake on Turbine Blade Heat Transfer in a Transonic Cascade
,” presented at the International Gas Turbine & Aeroengine Congress & Exhibition
, Orlando, FL, Paper No. 97-GT-130.20.
Schwarz
, S.
, and Goldstein
, R.
, 1989, “The Two-Dimensional Behaviour of Film Cooling Jets on Concave Surfaces
,” ASME J. Turbomach.
0889-504X, 111
, pp. 124
–130
.Copyright © 2011
by American
Society of Mechanical Engineers
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