An investigation of preferential interfacial reactions in nonmetalized composite solid propellant combustion

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Author
Biery, George Monroe
Date
1972-03Advisor
Netzer, D.W.
Second Reader
Naval Postgraduate School
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Show full item recordAbstract
Four nonraetalized solid propellants were burned at 500 psi
in strands of 1/2 in. by 1/2 in. cross section and 2 in.
length in both a dewetted and an as-cast state. Strands were
burned at acceleration levels from zero to lOOOg normal and
into the burning surface, and 50g and lOOOg normal and out of
the burning surface. The effects of changing interfacial
characteristics of the oxidizer and binder by prestressing
(dewetting) were studied to determine if preferential interfacial
reactions between binder and oxidizer particles
provided an accurate explanation of burning rate augmentation. Preferential interfacial reactions did not exist in the
propellents studied at the pressures and accelerations at
which the investigation was made. Soft binders in nonmetalized
propellants were found to allow oxidizer-binder Interaction
at high accelerations resulting in unstable combustion and
self-extinguishment. Nonmetalized composite propellants that
did not contain opacifiers appeared to burn more erratically
in a positive acceleration environment.
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