The present paper is based on an experimental study of a front-loaded very high lift, low pressure turbine blade designed at the VKI. The experiments have been carried out in a low-speed wind tunnel over a wide operating range of incidence and Reynolds number. The aim of the study is to characterize the flow through the cascade in terms of losses, mean outlet flow angle, and secondary flows. At low inlet freestream turbulence intensity, a laminar separation bubble is present, and a prediction model for a separated flow mode of transition has been developed.
Issue Section:
Technical Papers
1.
Howel
, R. J.
, Ramesh
, O. N.
, Hodson
, H. P.
, Harvey
, N. W.
, and Schulte
, V.
, 2001
, “High Lift and Aft-Loaded Profiles for Low-Pressure Turbines
,” ASME J. Turbomach.
, 123
, pp. 181
–188
.2.
Brunner, S., Fottner, L., and Schiffer, H.-P., 2000, “Comparison of Two Highly Loaded Low Pressure Turbine Cascades Under the Influence of Wake-Induced Transition,” ASME Paper 2000-GT-268.
3.
Solomon, W. J., 2000, “Effects of Turbulence and Solidity on the Boundary Layer Development in a Low Pressure Turbine,” ASME Paper 2000-GT-273.
4.
Roberts
, W. B.
, 1975
, “The Effect of Reynolds Number and Laminar Separation on Axial Cascade Performance
,” ASME J. Eng. Power
, 97
, pp. 261
–274
.5.
Mayle
, R. E.
, 1991
, “The Role of Laminar-Turbulent Transition in Gas Turbine Engines
,” ASME J. Turbomach.
, 113
, pp. 509
–537
.6.
Walker
, G. J.
, 1993
, “The Role of Laminar-Turbulent Transition in Gas Turbine Engines: A Discussion
,” ASME J. Turbomach.
, 115
, pp. 207
–218
.7.
Malkiel
, E.
, and Mayle
, R. E.
, 1996
, “Transition in Separation Bubble
,” ASME J. Turbomach.
, 118
, pp. 752
–759
.8.
Lou, W., and Hourmouziadis, J., 2000, “Separation Bubble under Steady and Unsteady Main Flow Conditions,” ASME Paper 2000-GT-0270.
9.
Qiu, S., and Simon, T. W., 1997, “An Experimental Investigation of Transition as Applied to Low Pressure Turbine Suction Surface Flows,” ASME Paper 97-GT-455.
10.
Volino, R. J., and Hultgren, L. S. 2000, “Measurements in Separated and Transitional Boundary Layers Under Low-Pressure Turbine Airfoil Conditions,” ASME Paper 2000-GT-0260.
11.
Volino, R. J., 2002, “Separated Flow Transition under Simulated Low-Pressure Turbine Airfoil Conditions: Part I—Mean Flow and Turbulence Statistics,” ASME Paper GT-2002-30236, and “Separated Flow Transition under Simulated Low-Pressure Turbine Airfoil Conditions: Part II—Turbulence Spectra,” ASME Paper GT-2002-30237.
12.
Hatman
, A.
, and Wang
, T.
, 1999
, “A Prediction Model for Separated-Flow Transition
,” ASME J. Turbomach.
, 121
, pp. 594
–602
.13.
Yaras, M. I., 2001, “Measurements of the Effects of Pressure-Gradients History on Separation-Bubble Transition,” ASME Paper 2001-GT-0193.
14.
Yaras, M. I., 2002, “Measurements of the Effects of Freestream Turbulence on Separation-Bubble Transition,” ASME Paper GT-2002-30232.
15.
Mu¨ller, M., Gallus, H. E., and Niehuis, R., 2000, “A Study on Models to Simulate Boundary Layer Transition in Turbomachinery Flows,” ASME Paper 2000-GT-274.
16.
Mu¨ller, M., Gallus, H. E., and Niehuis, R., 2001, “Numerical Simulation of the Boundary Layer Transition in Turbomachinery Flows,” ASME Paper 2001-GT-0475.
17.
Coton, T., Arts, T., Lefebvre, M., and Liamis, N., 2002, “Unsteady and Calming Effects Investigation on a Very High Lift LP Turbine Blade—Part I: Experimental Analysis,” ASME Paper GT-2002-30227.
18.
Schlichting, H., and Gersten, K., 2000, Boundary Layer Theory, Springer-Verlag, Heidelberg.
19.
Walker, G. J, 1989, “Modeling of Transitional Flow in Laminar Separation Bubbles,” Ninth International Symposium on Air Breathing Engines, Athens, Greece, Sept. AIAA ISABE, pp. 539–548.
20.
Narasimha
, R.
, 1985
, “The Laminar-Turbulent Transition Zone in the Boundary Layer
,” Prog. Aerosp. Sci.
, 22
(1
), pp. 29
–80
.Copyright © 2004
by ASME
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