FACTORS INFLUENCING IGNITION DELAY TIME OF COMPOSITE SOLID PROPELLANTS

Thermal events occurring on an near a propellant surface during ignition were observed simultaneously using an optical detector operating over two narrow wavelengths: 3.79 micrometers which is free of interfering CO2 and H2O thus representing radiation from the surface and 0.43 micrometers which det...

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Bibliographic Details
Main Authors: Atallah,S, Allan,D. S, Comstock,D. F. , Jr, Bastress,E. K
Format: Report
Language:English
Subjects:
COMBUSTION
Combustion and Ignition
COMPOSITE PROPELLANTS
CONVECTION(HEAT TRANSFER)
IGNITION
IGNITION LAG
PYROLYSIS
REACTION KINETICS
Solid Rocket Propellants
TEMPERATURE
THERMAL PROPERTIES
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Summary:Thermal events occurring on an near a propellant surface during ignition were observed simultaneously using an optical detector operating over two narrow wavelengths: 3.79 micrometers which is free of interfering CO2 and H2O thus representing radiation from the surface and 0.43 micrometers which detects the CH radical in the flame above the surface. Aluminized and non-aluminized PBAA/AP propellants were heated using an arc-imaging furnace with argon or oxygen flowing near the propellant surface at different velocities and irradiation levels. Combustion products of CO-O2-N2 mixtures of varying compositions were also used to heat the propellants convectively in a hot gas tunnel. Furthermore, the non-aluminized propellant was ignited chemically with fluorine. Differences in the ignition delay time as measured by the two detectors were observed under certain conditions. Factors affecting these differences and the magnitude of the delay time are discussed. (Author) Pub. in Proceedings, AIAA Aerospace Sciences Meeting (8th), New York, N. Y., 19-21 Jan 70, AIAA Paper no. 70-121. Prepared in cooperation with Northern Research and Engineering Corp., Cambridge, Mass.