The average burning rates of a series of composite solid propellantswere measured in acceleration fields up to 1000 G using a combustionbomb mounted on a centrifuge. The propellants were burned at constantpressures of 500, 1000, and 1500 psia. Specially prepared motorsallowed the study of the effect of simultaneous erosive and accelerationinduced burning rate increases. The burning rates of both the non-metallized and the majority of themetallized propellants were found to depend on acceleration. The effectof acceleration was found to depend on the basic burning rates of the propellantsand the aluminum and oxidizer partible sizes and weight precentages.The burning rates of two very fast burning rate propellants werefound to be essentially independent of acceleration. The erosion sensitivityof a propellant was found to decrease with increasing acceleration. A model was developed which successfully correlates the experimentalresults obtained for the non-metallized propellants. The experimentalresults for the metallized propellants could not be correlated by eitherof two models proposed by other investigators. This result indicatesthat a more complex model is required to explain the observed accelerationeffects for metallized propellants.
展开▼
