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Temperature Mapping of Air Film-Cooled Thermal Barrier Coated Surfaces Using Phosphor ThermometryWhile the effects of thermal barrier coating (TBC) thermal protection and air film cooling effectiveness for jet engine components are usually studied separately, their contributions to combined cooling effectiveness are interdependent and are not simply additive. Therefore, combined cooling effectiveness must be measured to achieve an optimum balance between TBC thermal protection and air film cooling. Phosphor thermometry offers several advantages for mapping temperatures of air film cooled surfaces. While infrared thermography has been typically applied to study air film cooling effectiveness, temperature accuracy depends on knowing surface emissivity (which may change) and correcting for effects of reflected radiation. Because decay time-based full-field phosphor thermometry is relatively immune to these effects, it can be applied advantageously to temperature mapping of air film-cooled TBC-coated surfaces. In this presentation, an overview will be given of efforts at NASA Glenn Research Center to perform temperature mapping of air film-cooled TBC-coated surfaces in a burner rig test environment. The effects of thermal background radiation and flame chemiluminescence on the measurements are investigated, and the strengths and limitations of this method for studying air film cooling effectiveness are discussed.
Document ID
Document Type
Eldridge, Jeffrey I.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
July 17, 2017
Publication Date
December 8, 2016
Subject Category
Research And Support Facilities (Air)
Instrumentation And Photography
Solid-State Physics
Report/Patent Number
Meeting Information
Lund University Physics Department Seminar(Lund)
Funding Number(s)
WBS: WBS 109492.
Distribution Limits
Work of the US Gov. Public Use Permitted.
air film cooling
phoshor thermometry
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