The benefits of different film cooling geometries are typically assessed in terms of their time-averaged performance. It is known that the mixing between the coolant film and the main turbine passage flow is an unsteady process. The current study investigates the forms of unsteadiness that occur in engine-representative film cooling flows and how this unsteadiness affects the mixing with the mainstream flow. Cylindrical and fan-shaped cooling holes across a range of hole blowing ratios have been studied experimentally using particle image velocimetry and high speed photography. Coherent unsteadiness is found in the shear layer between the jet and the mainstream for both cylindrical and fan-shaped cooling holes. Its occurrence and sense of rotation is found to be controlled by the velocity difference between the mainstream flow and the jet, which is largely determined by the blowing ratio.
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e-mail: richard.fawcett@eng.ox.ac.uk
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March 2012
Research Papers
Experimental Investigation Into Unsteady Effects on Film Cooling
Richard J. Fawcett,
Richard J. Fawcett
Department of Engineering Science,
e-mail: richard.fawcett@eng.ox.ac.uk
University of Oxford
, Oxford OX1 3PJ, United Kingdom
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Andrew P. S. Wheeler,
Andrew P. S. Wheeler
School of Engineering and Materials Science,
Queen Mary, University of London
, London E1 4NS, United Kingdom
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Li He,
Li He
Department of Engineering Science,
University of Oxford
, Oxford OX1 3PJ, United Kingdom
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Rupert Taylor
Rupert Taylor
Rolls-Royce
, Turbine Systems, Bristol BS34 7QE, United Kingdom
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Richard J. Fawcett
Department of Engineering Science,
University of Oxford
, Oxford OX1 3PJ, United Kingdome-mail: richard.fawcett@eng.ox.ac.uk
Andrew P. S. Wheeler
School of Engineering and Materials Science,
Queen Mary, University of London
, London E1 4NS, United Kingdom
Li He
Department of Engineering Science,
University of Oxford
, Oxford OX1 3PJ, United Kingdom
Rupert Taylor
Rolls-Royce
, Turbine Systems, Bristol BS34 7QE, United KingdomJ. Turbomach. Mar 2012, 134(2): 021015 (9 pages)
Published Online: June 28, 2011
Article history
Received:
June 28, 2010
Revised:
July 23, 2010
Online:
June 28, 2011
Published:
June 28, 2011
Citation
Fawcett, R. J., Wheeler, A. P. S., He, L., and Taylor, R. (June 28, 2011). "Experimental Investigation Into Unsteady Effects on Film Cooling." ASME. J. Turbomach. March 2012; 134(2): 021015. https://doi.org/10.1115/1.4003053
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