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Cooling Effectiveness Measurements for Air Film Cooling of Thermal Barrier Coated Surfaces in a Burner Rig Environment Using Phosphor ThermometryWhile the effects of thermal barrier coating (TBC) thermal protection and air film cooling effectiveness 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. In this investigation, surface temperature mapping was performed using recently developed Cr-doped GdAlO3 phosphor thermometry. Measurements were performed in the NASA GRC Mach 0.3 burner rig on a TBC-coated plate using a scaled up cooling hole geometry where both the mainstream hot gas temperature and the blowing ratio were varied. Procedures for surface temperature and cooling effectiveness mapping of the air film-cooled TBC-coated surface are described. Applications are also shown for an engine component in both the burner rig test environment as well as an engine afterburner environment. The effects of thermal background radiation and flame chemiluminescence on the measurements are investigated, and advantages of this method over infrared thermography as well as the limitations of this method for studying air film cooling are discussed.
Document ID
Document Type
Eldridge, Jeffrey I.
(NASA Glenn Research Center Cleveland, OH United States)
Shyam, Vikram
(NASA Glenn Research Center Cleveland, OH United States)
Wroblewski, Adam C.
(NASA Glenn Research Center Cleveland, OH United States)
Zhu, Dongming
(NASA Glenn Research Center Cleveland, OH United States)
Cuy, Michael D.
(Vantage Partners, LLC Cleveland, OH, United States)
Wolfe, Douglas E.
(Pennsylvania State Univ. University Park, PA, United States)
Date Acquired
February 22, 2017
Publication Date
June 13, 2016
Subject Category
Fluid Mechanics And Thermodynamics
Mechanical Engineering
Report/Patent Number
Meeting Information
AIAA Aviation 2016(Washington, DC)
Funding Number(s)
WBS: WBS 109492.
Distribution Limits
Public Use Permitted.
air film cooling
thermographic phosphor
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