Complex vortical secondary flows that are present near the endwall of an axial gas turbine blade are responsible for high heat transfer rates and high aerodynamic losses. The application of nonaxisymmetric, three-dimensional contouring to the endwall surface has been shown to reduce the strength of the vortical flows and decrease total pressure losses when compared with a flat endwall. The reduction in secondary flow strength with nonaxisymmetric contouring might also be expected to reduce endwall heat transfer. In this study, measurements of endwall heat transfer were taken for a low-pressure turbine blade geometry with both flat and three-dimensional contoured endwalls. Endwall oil flow visualization indicated a reduction in the passage vortex strength for the contoured endwall geometry. Heat transfer levels were reduced by 20% in regions of high heat transfer with the contoured endwall, as compared with the flat endwall. The heat transfer benefit of the endwall contour was not affected by changes in the cascade Reynolds number.
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January 2011
Research Papers
Heat Transfer for a Turbine Blade With Nonaxisymmetric Endwall Contouring
Stephen P. Lynch,
Stephen P. Lynch
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
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Narayan Sundaram,
Narayan Sundaram
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
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Karen A. Thole,
Karen A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
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Atul Kohli,
Atul Kohli
Pratt & Whitney
, 400 Main Street, East Hartford, CT 06108
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Christopher Lehane
Christopher Lehane
Pratt & Whitney
, 400 Main Street, East Hartford, CT 06108
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Stephen P. Lynch
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
Narayan Sundaram
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
Karen A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
Atul Kohli
Pratt & Whitney
, 400 Main Street, East Hartford, CT 06108
Christopher Lehane
Pratt & Whitney
, 400 Main Street, East Hartford, CT 06108J. Turbomach. Jan 2011, 133(1): 011019 (9 pages)
Published Online: September 23, 2010
Article history
Received:
July 6, 2009
Revised:
July 25, 2009
Online:
September 23, 2010
Published:
September 23, 2010
Citation
Lynch, S. P., Sundaram, N., Thole, K. A., Kohli, A., and Lehane, C. (September 23, 2010). "Heat Transfer for a Turbine Blade With Nonaxisymmetric Endwall Contouring." ASME. J. Turbomach. January 2011; 133(1): 011019. https://doi.org/10.1115/1.4000542
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