A common method of optimizing coolant performance in gas turbine engines is through the use of shaped film-cooling holes. Despite widespread use of shaped holes, existing correlations for predicting performance are limited to narrow ranges of parameters. This study extends the prediction capability for shaped holes through the development of a physics-based empirical correlation for predicting laterally averaged film-cooling effectiveness on a flat-plate downstream of a row of shaped film-cooling holes. Existing data were used to determine the physical relationship between film-cooling effectiveness and several parameters, including blowing ratio, hole coverage ratio, area ratio, and hole spacing. Those relationships were then incorporated into the skeleton form of an empirical correlation, using results from the literature to determine coefficients for the correlation. Predictions from the current correlation, as well as existing shaped-hole correlations and a cylindrical hole correlation, were compared with the existing experimental data. Results show that the current physics-based correlation yields a significant improvement in predictive capability, by expanding the valid parameter range and improving agreement with experimental data. Particularly significant is the inclusion of higher blowing ratio conditions (up to ) into the current correlation, whereas the existing correlations worked adequately only at lower blowing ratios .
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January 2011
Research Papers
A Film-Cooling Correlation for Shaped Holes on a Flat-Plate Surface
Will F. Colban,
Will F. Colban
Combustion Research Facility,
Sandia National Laboratories
, Livermore, CA 94551
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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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David Bogard
David Bogard
Department of Mechanical Engineering,
University of Texas at Austin
, Austin, TX 78712
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Will F. Colban
Combustion Research Facility,
Sandia National Laboratories
, Livermore, CA 94551
Karen A. Thole
Department of Mechanical and Nuclear Engineering,
Pennsylvania State University
, University Park, PA 16802
David Bogard
Department of Mechanical Engineering,
University of Texas at Austin
, Austin, TX 78712J. Turbomach. Jan 2011, 133(1): 011002 (11 pages)
Published Online: September 7, 2010
Article history
Received:
August 28, 2008
Revised:
June 4, 2010
Online:
September 7, 2010
Published:
September 7, 2010
Citation
Colban, W. F., Thole, K. A., and Bogard, D. (September 7, 2010). "A Film-Cooling Correlation for Shaped Holes on a Flat-Plate Surface." ASME. J. Turbomach. January 2011; 133(1): 011002. https://doi.org/10.1115/1.4002064
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