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Effect of Cyclic Aeroconvective Heating on Flexible Thermal InsulationsThis paper describes the effect of cyclic aeroconvective heating on the thermal performance of ceramic flexible insulations considered for potential use as thermal protection systems or thermal insulations for future hypersonic vehicles such as the Reusable Launch Vehicles (RLV's) and other applications where structures require thermal protection from severe heating. The thermal response of these materials after exposure to cyclic aeroconvective heating from a plasma arc is described. The thermal insulations evaluated were Composite Flexible Blanket Insulations composed of an outer layer of aluminoborosilicate fabric and alumina insulation. The insulations were evaluated with and without a high emissivity coating. These insulations were exposed to the plasma arc stream for nine minutes reaching surface temperatures of 1150 C and a heat flux of 10.5 W/sq cm. Insulations were exposed three, six, or nine times in order to demonstrate reusability and to determine the effect oi coatings on the surface durability of these insulations. Test results demonstrated the capability of these insulations to protect either composite or metallic structures from high heating environments. It is shown that high emittance coatings reduce backface temperatures. The durability of these insulations when impacted at low velocities was also demonstrated. The interaction of the coatings with the ceramic fibers was characterized. An analytical thermal model was utilized to correlate experimental thermal test results with calculated values.
Document ID
20020039420
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Kourtides, Demetrius A.
(NASA Ames Research Center Moffett Field, CA United States)
Zambrano, Brian
(California Polytechnic State Univ. San Luis Obispo, CA United States)
Kowalski, Tom
(Thermoscience Inst. Moffett Field, CA United States)
Rasky, Daniel J.
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Astronomy
Meeting Information
Meeting: 41st International Symposium and Exhibition of the Society for the Advancement of Material and Process Engineering
Location: Anaheim, CA
Country: United States
Start Date: March 25, 1996
End Date: March 28, 1996
Sponsors: Society for the Advancement of Materials and Process Engineering
Funding Number(s)
PROJECT: RTOP 242-20-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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