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Surface Temperature Measurements from a Stator Vane Doublet in a Turbine Engine Afterburner Flame using Ultra-Bright Cr-Doped GdAlO3 Thermographic PhosphorLuminescence-based surface temperature measurements from an ultra-bright Cr-doped GdAlO3 perovskite (GAP:Cr) coating were successfully conducted on an air-film-cooled stator vane doublet exposed to the afterburner flame of a J85 test engine at University of Tennessee Space Institute (UTSI). The objective of the testing at UTSI was to demonstrate that reliable thermal barrier coating (TBC) surface temperatures based on luminescence decay of a thermographic phosphor could be obtained from the surface of an actual engine component in an aggressive afterburner flame environment and to address the challenges of a highly radiant background and high velocity gases. A high-pressure turbine vane doublet from a Honeywell TECH7000 turbine engine was coated with a standard electron-beam physical vapor deposited (EB-PVD) 200-m-thick TBC composed of yttria-stabilized zirconia (YSZ) onto which a 25-m-thick GAP:Cr thermographic phosphor layer was deposited by EB-PVD. The ultra-bright broadband luminescence from the GAP:Cr thermographic phosphor is shown to offer the advantage of over an order-of-magnitude greater emission intensity compared to rare-earth-doped phosphors in the engine test environment. This higher emission intensity was shown to be very desirable for overcoming the necessarily restricted probe light collection solid angle and for achieving high signal-to-background levels. Luminescence-decay-based surface temperature measurements varied from 500 to over 1000C depending on engine operating conditions and level of air film cooling.
Document ID
Document Type
Eldridge, Jeffrey I.
(NASA Glenn Research Center Cleveland, OH, United States)
Jenkins, Thomas P.
(MetroLaser, Inc. Irvine, CA, United States)
Allison, Stephen W.
(Emerging Measurements Knoxville, TN, United States)
Wolfe, Douglas E.
(Pennsylvania State Univ. University Park, PA, United States)
Howard, Robert P.
(Arnold Engineering Development Center Arnold AFS, TN, United States)
Date Acquired
August 27, 2013
Publication Date
May 13, 2013
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
Meeting Information
Meeting: 59th International Instrumentation Symposium
Location: Cleveland, OH
Country: United States
Start Date: May 13, 2013
End Date: May 17, 2013
Funding Number(s)
WBS: WBS 031102.02.03.0960.12
Distribution Limits
Public Use Permitted.
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