Film cooling and sprayed thermal barrier coatings (TBCs) protect gas turbine components from the hot combustion gas temperatures. As gas turbine designers pursue higher turbine inlet temperatures, film cooling and TBCs are critical in protecting the durability of turbomachinery hardware. One obstacle to the synergy of these technologies is that TBC coatings can block cooling holes when applied to the components, causing a decrease in the film cooling flow area thereby reducing coolant flow for a given pressure ratio (PR). In this study, the effect of TBC blockages was simulated on film cooling holes for widely spaced cylindrical and shaped holes. At low blowing ratios for shaped holes, the blockages were found to have very little effect on adiabatic effectiveness. At high blowing ratios, the area-averaged effectiveness of shaped and cylindrical holes decreased as much as 75% from blockage. The decrease in area-averaged effectiveness was found to scale best with the effective momentum flux ratio of the jet exiting the film cooling hole for the shaped holes.
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September 2015
Research-Article
Blockage Effects From Simulated Thermal Barrier Coatings for Cylindrical and Shaped Cooling Holes
Christopher A. Whitfield,
Christopher A. Whitfield
Mechanical and Nuclear Engineering Department,
e-mail: christopher.whitfield@pw.utc.com
The Pennsylvania State University
,University Park, PA 16802
e-mail: christopher.whitfield@pw.utc.com
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Robert P. Schroeder,
Robert P. Schroeder
Mechanical and Nuclear Engineering Department,
e-mail: rschroeder@psu.edu
The Pennsylvania State University
,University Park, PA 16802
e-mail: rschroeder@psu.edu
Search for other works by this author on:
Karen A. Thole,
Karen A. Thole
Mechanical and Nuclear Engineering Department,
e-mail: kthole@engr.psu.edu
The Pennsylvania State University
,University Park, PA 16802
e-mail: kthole@engr.psu.edu
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Scott D. Lewis
Scott D. Lewis
Search for other works by this author on:
Christopher A. Whitfield
Mechanical and Nuclear Engineering Department,
e-mail: christopher.whitfield@pw.utc.com
The Pennsylvania State University
,University Park, PA 16802
e-mail: christopher.whitfield@pw.utc.com
Robert P. Schroeder
Mechanical and Nuclear Engineering Department,
e-mail: rschroeder@psu.edu
The Pennsylvania State University
,University Park, PA 16802
e-mail: rschroeder@psu.edu
Karen A. Thole
Mechanical and Nuclear Engineering Department,
e-mail: kthole@engr.psu.edu
The Pennsylvania State University
,University Park, PA 16802
e-mail: kthole@engr.psu.edu
Scott D. Lewis
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 14, 2014; final manuscript received December 1, 2014; published online March 10, 2015. Editor: Ronald Bunker.
J. Turbomach. Sep 2015, 137(9): 091004 (10 pages)
Published Online: September 1, 2015
Article history
Received:
July 14, 2014
Revision Received:
December 1, 2014
Online:
March 10, 2015
Citation
Whitfield, C. A., Schroeder, R. P., Thole, K. A., and Lewis, S. D. (September 1, 2015). "Blockage Effects From Simulated Thermal Barrier Coatings for Cylindrical and Shaped Cooling Holes." ASME. J. Turbomach. September 2015; 137(9): 091004. https://doi.org/10.1115/1.4029879
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