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Experimental Evaluation of Hot Films on Ceramic Substrates for Skin-Friction MeasurementAn investigation has been performed on the use of low-thermal conductivity, ceramic substrates for hot films intended to measure skin friction. Hot films were deposited on two types of ceramic substrates. Four hot films used composite-ceramic substrates with subsurface thermocouples (TCs), and two hot films were deposited on thin Macor(R) substrates. All six sensors were tested side by side in the wall of the NASA Glenn Research Center 8-ft by 6-ft Supersonic Wind Tunnel (SWT). Data were obtained from zero flow to Mach 1.98 in air. Control measurements were made with three Preston tubes and two boundary-layer rakes. The tests were repeated at two different hot film power levels. All hot films and subsurface TCs functioned throughout the three days of testing. At zero flow, the films on the high-thermal conductivity Macor(R) substrates required approximately twice the power as those on the composite-ceramic substrates. Skin-friction results were consistent with the control measurements. Estimates of the conduction heat losses were made using the embedded TCs but were hampered by variability in coating thicknesses and TC locations.
Document ID
20030052314
Acquisition Source
Armstrong Flight Research Center
Document Type
Technical Memorandum (TM)
Authors
Noffz, Gregory K.
(NASA Dryden Flight Research Center Edwards, CA, United States)
Lavine, Adrienne S.
(California Univ. Los Angeles, CA, United States)
Hamory, Philip J.
(NASA Dryden Flight Research Center Edwards, CA, United States)
Date Acquired
August 21, 2013
Publication Date
March 1, 2003
Subject Category
Nonmetallic Materials
Report/Patent Number
H-2517
NAS 1.15:210742
NASA/TM-2003-210742
Meeting Information
Meeting: 6th ASME-JSME Thermal Engineering Joint Conference
Location: Hawaii Island, HI
Country: United States
Start Date: March 16, 2003
End Date: March 20, 2003
Sponsors: Japan Society of Mechanical Engineers, American Society of Mechanical Engineers
Funding Number(s)
WORK_UNIT: Wu 710-55-04
Distribution Limits
Public
Copyright
Public Use Permitted.
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