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Effects of varying Reynolds number, blowing ratio, and internal geometry on trailing edge cutback film cooling

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Abstract

Three-dimensional mean velocity and concentration fields have been measured for a water flow in a pressure side cutback trailing edge film cooling geometry consisting of rectangular film cooling slots separated by tapered lands. Three-component mean velocities were measured with conventional magnetic resonance velocimetry, while time-averaged concentration distributions were measured with a magnetic resonance concentration technique for flow at two Reynolds numbers (Re) differing by a factor of 2, three blowing ratios, and with and without an internal pin fin array in the coolant feed channel. The results show that the flows are essentially independent of Re for the regime tested in terms of the film cooling surface effectiveness, normalized velocity profiles, and normalized mean streamwise vorticity. Blowing ratio changes had a larger effect, with higher blowing ratios resulting in surface effectiveness improvements at downstream locations. The addition of a pin fin array within the slot feed channel made the spanwise distribution of coolant at the surface more uniform. Results are compared with transonic experiments in air at realistic density ratios described by Holloway et al. (2002a).

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Acknowledgments

Financial support for the project was provided by General Electric under the University Strategic Alliance program. In addition, this material is based upon work supported in part by the U. S. Army Research Office under contract/grant number 57392-EG-II. Use of the facilities at the Richard M. Lucas Center for Magnetic Resonance Spectroscopy and Imaging is gratefully acknowledged. The authors wish to thank the United States Army for funding the first author in his doctoral studies at Stanford. The views expressed herein are those of the authors and do not purport to reflect the position of the Department of the Army, or the Department of Defense.

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Authors and Affiliations

  1. Department of Civil and Mechanical Engineering, United States Military Academy, West Point, NY, 10996, USA

    Michael J. Benson

  2. Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA

    Christopher J. Elkins, Sayuri D. Yapa, Julia B. Ling & John K. Eaton

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  1. Michael J. Benson
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  2. Christopher J. Elkins
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  3. Sayuri D. Yapa
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  4. Julia B. Ling
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  5. John K. Eaton
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Correspondence to Michael J. Benson.

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Benson, M.J., Elkins, C.J., Yapa, S.D. et al. Effects of varying Reynolds number, blowing ratio, and internal geometry on trailing edge cutback film cooling. Exp Fluids 52, 1415–1430 (2012). https://doi.org/10.1007/s00348-012-1260-1

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  • DOI: https://doi.org/10.1007/s00348-012-1260-1

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