The effect of the upstream wake on the time averaged rotor blade heat transfer was numerically investigated. The geometry and flow conditions of the first stage turbine blade of GE’s engine with a tip clearance equal to 2% of the span were utilized. The upstream wake had both a total pressure and temperature deficit. The rotor inlet conditions were determined from a steady analysis of the cooled upstream vane. Comparisons between the time average of the unsteady rotor blade heat transfer and the steady analysis, which used the average inlet conditions of unsteady cases, are made to illuminate the differences between the steady and unsteady calculations. To help in the understanding of the differences between steady and unsteady results on one hand and to evaluate the effect of the total temperature wake on the other, separate calculations were performed to obtain the rotor heat transfer and adiabatic wall temperatures. It was found that the Nusselt number distribution for the time average of unsteady heat transfer is invariant if normalized by the difference in the adiabatic and wall temperatures. It appeared though that near the endwalls the Nusselt number distribution did depend on the thermal wake strength. Differences between steady and time averaged unsteady heat transfer results of up to 20% were seen on the blade surface. Differences were less on the blade tip surface.
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October 2010
Research Papers
Unsteady Analysis of Blade and Tip Heat Transfer as Influenced by the Upstream Momentum and Thermal Wakes
Ali A. Ameri,
Ali A. Ameri
Department of Aerospace Engineering,
Ohio State University
, Columbus, OH 43210
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David L. Rigby,
David L. Rigby
ASRC Aerospace,
NASA Glenn Research Center
, Cleveland, OH 44135
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Erlendur Steinthorsson,
Erlendur Steinthorsson
A and E Consulting
, Westlake, OH 44140
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James Heidmann,
James Heidmann
NASA Glenn Research Center
, Cleveland, OH 44135
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John C. Fabian
John C. Fabian
NASA Glenn Research Center
, Cleveland, OH 44135
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Ali A. Ameri
Department of Aerospace Engineering,
Ohio State University
, Columbus, OH 43210
David L. Rigby
ASRC Aerospace,
NASA Glenn Research Center
, Cleveland, OH 44135
Erlendur Steinthorsson
A and E Consulting
, Westlake, OH 44140
James Heidmann
NASA Glenn Research Center
, Cleveland, OH 44135
John C. Fabian
NASA Glenn Research Center
, Cleveland, OH 44135J. Turbomach. Oct 2010, 132(4): 041007 (7 pages)
Published Online: April 29, 2010
Article history
Received:
August 28, 2008
Revised:
February 9, 2009
Online:
April 29, 2010
Published:
April 29, 2010
Citation
Ameri, A. A., Rigby, D. L., Steinthorsson, E., Heidmann, J., and Fabian, J. C. (April 29, 2010). "Unsteady Analysis of Blade and Tip Heat Transfer as Influenced by the Upstream Momentum and Thermal Wakes." ASME. J. Turbomach. October 2010; 132(4): 041007. https://doi.org/10.1115/1.3213549
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