IGNITION OF AN EVAPORATING FUEL IN A HOT OXIDIZING GAS, INCLUDING THE EFFECT OF HEAT FEEDBACK.
Scientific rept. 1 Oct 63-30 Sep 64,
PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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The purpose of the research was to explore theoretically the phenomenon of ignition of a condensed phase fuel by a stationary hot igniting gas containing an oxidizing constituent. This theoretical development is one step in the larger problem of the ignition of a solid propellant by a stream of hot reactive gas generated by a pyrogen-type igniter. The theory has direct application to previous and concurrent ignition experiments of fuels in shock tubes. The most significant finding is that solid fuels having very low volatilities can ignite via a gas phase reaction mechanism in times as short as a millisecond. The essential physical process that makes this possible is the feedback of heat by conduction to the surface from the incipient reaction zone that starts in the gas phase. The predictions of the theory with respect to the effects of pressure and oxygen content in the gas phase on ignition delay are in qualitative agreement with shock tube experimental results. The theory has broader significance as a first rigorous penetration into the domain of diffusion limited ignition reactions as distinguished from the classical domain of auto-thermal ignitions in homogeneous explosive media. Author
- Combustion and Ignition
- Solid Rocket Propellants