The necessity of performing an unsteady simulation for the purpose of predicting the heat transfer on the endwall surfaces of a turbine passage is addressed. This is measured by the difference between the two solutions obtained from a steady simulation and the time average of an unsteady simulation. The heat transfer coefficient (Nusselt number) based on the adiabatic wall temperature is used as the basis of the comparison. As there is no film cooling in the proposed case, a computed heat transfer coefficient should be a better measure of such difference than, say, a wall heat flux. Results show that the effect of unsteadiness due to wake passage on the pressures and recovery temperatures on both hub and casing is negligible. Heat transfer on the endwalls, however, is affected by the unsteady wake; the time-averaged results yield higher heat transfer; in some regions, up to 15% higher. The results for the endwall heat transfer were compared with results in open literature and were found to be comparable.
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July 2011
Research Papers
Comparison of Steady and Unsteady RANS Heat Transfer Simulations of Hub and Endwall of a Turbine Blade Passage
Lamyaa A. El-Gabry,
Lamyaa A. El-Gabry
Department of Mechanical Engineering,
e-mail: lelgabry@aucegypt.edu
The American University in Cairo
, New Cairo 11835, Egypt
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Ali A. Ameri
Ali A. Ameri
Department of Aerospace Engineering,
The Ohio State University
, Columbus, OH 43210
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Lamyaa A. El-Gabry
Department of Mechanical Engineering,
The American University in Cairo
, New Cairo 11835, Egypte-mail: lelgabry@aucegypt.edu
Ali A. Ameri
Department of Aerospace Engineering,
The Ohio State University
, Columbus, OH 43210J. Turbomach. Jul 2011, 133(3): 031010 (9 pages)
Published Online: November 15, 2010
Article history
Received:
August 27, 2009
Revised:
May 22, 2010
Online:
November 15, 2010
Published:
November 15, 2010
Citation
El-Gabry, L. A., and Ameri, A. A. (November 15, 2010). "Comparison of Steady and Unsteady RANS Heat Transfer Simulations of Hub and Endwall of a Turbine Blade Passage." ASME. J. Turbomach. July 2011; 133(3): 031010. https://doi.org/10.1115/1.4002412
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