Emissivity of rocket plume particulates.

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Author
Whisman, Curtis D.
Date
1992-09Advisor
Netzer, David W.
Second Reader
Hobson, Garth
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Show full item recordAbstract
The optical properties of motor aluminum oxide are
required inputs to current plume signature prediction codes,
such as SIRRM. Accurate predictions are possible only if
variations in the particle emissivity due to changes in
particle size, contamination, and changing temperature, etc.
,
are known
.
This investigation demonstrated a simplified method for
determination of the emissivity of rocket motor generated
alumina. Plume particulate material was collected on tungsten
alloy wire during motor firings. A DC circuit was used to
resistively heat the material, and the temperature was
determined at various points by relating the wire resistivity
to circuit current and voltage. An Agema Thermovision
infrared (3.5-5 (j.) camera and microscope were used to observe
the material during heating, and broad-band emissivity was
computed using system software. It was estimated that the
emissivity could be measured with an accuracy of ± 3%. Motor
alumina was found to have significantly greater emissivity
than pure alumina in the temperature range of 500-1200K.
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