Unsteady Burning of Solid Propellants
Final rept. 1 Jul 1976-30 Sep 1977
INSTITUTO NACIONAL DE TECNICA AEROSPACIAL MADRID (SPAIN)
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A theoretical analysis is presented of unsteady solid propellant combustion, particularly combustion stability and extinction by rapid depressurization. It is assumed that the solid decomposes by a pyrolosis law and the gaseous products react exothermically following an Arrhenius law. For large values of this non-dimensional activation energy the gas-phase combustion, turns out to be quasisteady. The characteristic response time of the solid to gas-phase perturbations turns out to be large compared to the characteristic residence time in the heat-up zone of the solid, their ratio being of the order of the non-dimensional activation energy in the gas-phase. A linear stability criterion has been obtained that gives stable burning for steady burning rates above and below two limiting values the width of the unstable region increases with the activation energy of the pyrolisis law, and becomes zero for a finite value of that activation energy.
- Combustion and Ignition
- Solid Rocket Propellants