Adiabatic film cooling effectiveness contours are obtained experimentally with the use of temperature sensitive paint (TSP) on low thermal conductivity film cooled surfaces. The effects of blowing ratio, surface angle, and hole spacing are observed by testing four full-coverage arrays composed of cylindrical staggered holes all compounded at 45 deg, which parametrically vary the inclination angles, 30 deg and 45 deg, and the spacing of the holes 14.5 and 19.8 times the diameter. Local film cooling effectiveness is obtained throughout these largely spaced arrays to 23 rows for the 19.8 diameter spacing array and 30 rows for the 14.5 diameter spacing array. The coolant takes several rows to merge and begin to interact with lateral holes at these large spacings; however, at downstream rows the film merges laterally and provides high effectiveness in the gaps between injections. At low blowing, each individual jet remains discrete throughout the array. At higher blowing rates, the profile is far more uniform due to jets spreading as they reattach with the wall. Laterally averaged values of effectiveness approach 0.3 in most cases with some high blowing low spacing, even reaching 0.5.
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July 2016
Research-Article
Experimental Evaluation of Large Spacing Compound Angle Full-Coverage Film Cooling Arrays: Adiabatic Film Cooling Effectiveness
Greg Natsui,
Greg Natsui
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: gnatsui@knights.ucf.edu
University of Central Florida,
Orlando, FL 32816
e-mail: gnatsui@knights.ucf.edu
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Roberto Claretti,
Roberto Claretti
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Roberto1632@gmail.com
University of Central Florida,
Orlando, FL 32816
e-mail: Roberto1632@gmail.com
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Mark A. Ricklick,
Mark A. Ricklick
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Mark.Ricklick@erau.edu
University of Central Florida,
Orlando, FL 32816
e-mail: Mark.Ricklick@erau.edu
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Jayanta S. Kapat,
Jayanta S. Kapat
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Jayanta.Kapat@ucf.edu
University of Central Florida,
Orlando, FL 32816
e-mail: Jayanta.Kapat@ucf.edu
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Kenneth Landis
Kenneth Landis
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Greg Natsui
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: gnatsui@knights.ucf.edu
University of Central Florida,
Orlando, FL 32816
e-mail: gnatsui@knights.ucf.edu
Roberto Claretti
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Roberto1632@gmail.com
University of Central Florida,
Orlando, FL 32816
e-mail: Roberto1632@gmail.com
Mark A. Ricklick
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Mark.Ricklick@erau.edu
University of Central Florida,
Orlando, FL 32816
e-mail: Mark.Ricklick@erau.edu
Jayanta S. Kapat
Department of Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Jayanta.Kapat@ucf.edu
University of Central Florida,
Orlando, FL 32816
e-mail: Jayanta.Kapat@ucf.edu
Michael E. Crawford
Glenn Brown
Kenneth Landis
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received March 26, 2015; final manuscript received January 12, 2016; published online February 17, 2016. Assoc. Editor: David G. Bogard.
J. Turbomach. Jul 2016, 138(7): 071001 (8 pages)
Published Online: February 17, 2016
Article history
Received:
March 26, 2015
Revised:
January 12, 2016
Citation
Natsui, G., Claretti, R., Ricklick, M. A., Kapat, J. S., Crawford, M. E., Brown, G., and Landis, K. (February 17, 2016). "Experimental Evaluation of Large Spacing Compound Angle Full-Coverage Film Cooling Arrays: Adiabatic Film Cooling Effectiveness." ASME. J. Turbomach. July 2016; 138(7): 071001. https://doi.org/10.1115/1.4032538
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