This paper experimentally and numerically investigates the effects of large scale high freestream turbulence intensity and exit Reynolds number on the surface heat transfer distribution of a turbine vane in a 2D linear cascade at realistic engine Mach numbers. A passive turbulence grid was used to generate a freestream turbulence level of 16% and integral length scale normalized by the vane pitch of 0.23 at the cascade inlet. The base line turbulence level and integral length scale normalized by the vane pitch at the cascade inlet were measured to be 2% and 0.05, respectively. Surface heat transfer measurements were made at the midspan of the vane using thin film gauges. Experiments were performed at exit Mach numbers of 0.55, 0.75, and 1.01, which represent flow conditions below, near, and above nominal conditions. The exit Mach numbers tested correspond to exit Reynolds numbers of , , and based on a vane chord. The experimental results showed that the large scale high freestream turbulence augmented the heat transfer on both the pressure and suction sides of the vane as compared to the low freestream turbulence case and promoted a slightly earlier boundary layer transition on the suction surface for exit Mach 0.55 and 0.75. At nominal conditions, exit Mach 0.75, average heat transfer augmentations of 52% and 25% were observed on the pressure and suction sides of the vane, respectively. An increased Reynolds number was found to induce an earlier boundary layer transition on the vane suction surface and to increase heat transfer levels on the suction and pressure surfaces. On the suction side, the boundary layer transition length was also found to be affected by increase changes in Reynolds number. The experimental results also compared well with analytical correlations and computational fluid dynamics predictions.
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April 2009
Research Papers
Effects of Large Scale High Freestream Turbulence and Exit Reynolds Number on Turbine Vane Heat Transfer in a Transonic Cascade
Shakeel Nasir,
Shakeel Nasir
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Jeffrey S. Carullo,
Jeffrey S. Carullo
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Wing-Fai Ng,
Wing-Fai Ng
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Karen A. Thole,
Karen A. Thole
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Hong Wu,
Hong Wu
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
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Luzeng J. Zhang,
Luzeng J. Zhang
Heat Transfer Department,
Solar Turbines Inc.
, San Diego, CA 92186
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Hee Koo Moon
Hee Koo Moon
Heat Transfer Department,
Solar Turbines Inc.
, San Diego, CA 92186
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Shakeel Nasir
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
Jeffrey S. Carullo
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
Wing-Fai Ng
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
Karen A. Thole
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
Hong Wu
Department of Mechanical Engineering,
Virginia Polytechnic Institute and State University
, Blacksburg, VA 24061
Luzeng J. Zhang
Heat Transfer Department,
Solar Turbines Inc.
, San Diego, CA 92186
Hee Koo Moon
Heat Transfer Department,
Solar Turbines Inc.
, San Diego, CA 92186J. Turbomach. Apr 2009, 131(2): 021021 (11 pages)
Published Online: February 3, 2009
Article history
Received:
September 18, 2007
Revised:
October 21, 2007
Published:
February 3, 2009
Citation
Nasir, S., Carullo, J. S., Ng, W., Thole, K. A., Wu, H., Zhang, L. J., and Moon, H. K. (February 3, 2009). "Effects of Large Scale High Freestream Turbulence and Exit Reynolds Number on Turbine Vane Heat Transfer in a Transonic Cascade." ASME. J. Turbomach. April 2009; 131(2): 021021. https://doi.org/10.1115/1.2952381
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