Blockage Effects From Simulated Thermal Barrier Coatings for Cylindrical and Shaped Cooling Holes-Reference-Cited by-同舟云学术

Blockage Effects From Simulated Thermal Barrier Coatings for Cylindrical and Shaped Cooling Holes

Published:2015-09-01 Issue:9 Volume:137 Page:
ISSN:0889-504X
Container-title:Journal of Turbomachinery
language:en
Short-container-title:

Author:

Whitfield Christopher A.¹,Schroeder Robert P.¹,Thole Karen A.¹,Lewis Scott D.²

Affiliation:

1. Mechanical and Nuclear Engineering Department, The Pennsylvania State University, University Park, PA 16802 e-mail:

2. Pratt & Whitney, 400 Main Street, East Hartford, CT 06118 e-mail:

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/turbomachinery/article-pdf/doi/10.1115/1.4029879/6302804/turbo_137_09_091004.pdf

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