This paper experimentally investigates the effect of high freestream turbulence intensity, turbulence length scale, and exit Reynolds number on the surface heat transfer distribution of a turbine blade at realistic engine Mach numbers. Passive turbulence grids were used to generate freestream turbulence levels of 2%, 12%, and 14% at the cascade inlet. The turbulence grids produced length scales normalized by the blade pitches of 0.02, 0.26, and 0.41, respectively. Surface heat transfer measurements were made at the midspan of the blade using thin film gauges. Experiments were performed at the exit Mach numbers of 0.55, 0.78, and 1.03, which represent flow conditions below, near, and above nominal conditions. The exit Mach numbers tested correspond to exit Reynolds numbers of , , and , based on true chord. The experimental results showed that the high freestream turbulence augmented the heat transfer on both the pressure and suction sides of the blade as compared with the low freestream turbulence case. At nominal conditions, exit Mach 0.78, average heat transfer augmentations of 23% and 35% were observed on the pressure side and suction side of the blade, respectively.
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January 2011
Research Papers
The Effects of Freestream Turbulence, Turbulence Length Scale, and Exit Reynolds Number on Turbine Blade Heat Transfer in a Transonic Cascade
J. S. Carullo,
J. S. Carullo
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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S. Nasir,
S. Nasir
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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R. D. Cress,
R. D. Cress
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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W. F. Ng,
W. F. Ng
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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K. A. Thole,
K. A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
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L. J. Zhang,
L. J. Zhang
Solar Turbines Inc.
, San Diego, CA 92101
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H. K. Moon
H. K. Moon
Solar Turbines Inc.
, San Diego, CA 92101
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J. S. Carullo
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
S. Nasir
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
R. D. Cress
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
W. F. Ng
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
K. A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
L. J. Zhang
Solar Turbines Inc.
, San Diego, CA 92101
H. K. Moon
Solar Turbines Inc.
, San Diego, CA 92101J. Turbomach. Jan 2011, 133(1): 011030 (11 pages)
Published Online: September 28, 2010
Article history
Received:
January 3, 2008
Revised:
January 29, 2010
Online:
September 28, 2010
Published:
September 28, 2010
Citation
Carullo, J. S., Nasir, S., Cress, R. D., Ng, W. F., Thole, K. A., Zhang, L. J., and Moon, H. K. (September 28, 2010). "The Effects of Freestream Turbulence, Turbulence Length Scale, and Exit Reynolds Number on Turbine Blade Heat Transfer in a Transonic Cascade." ASME. J. Turbomach. January 2011; 133(1): 011030. https://doi.org/10.1115/1.4001366
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