Condensed combustion products of aluminized propellants. II. Evolution of particles with distance from the burning surface

Condensed combustion products of a model propellant on the basis of ammoniu m perchlorate and aluminum were studied using the sampling technique. The g ranulometric composition of combustion products and the content of metal al uminum in particles of size from 1.2 mum to maximum were determined within the pressure range of 0.6-7.5 MPa at a distance from the burning surface up to 190 mm. A multimode structure of mass distributions of oxide particles within the size range of 1.2-40 mum was found. An empirical dependence of b urnout of metal aluminum from agglomerates on the residence time of particl es in the plume of combustion products of the propellant sample was obtaine d.