Burning Characteristics of AP/HTPB Composite Propellant Prepared with Fine Porous or Hollow AP

摘要

Fine porous or hollow ammonium perchlorate (AP) particles were prepared by the spray-drying method. First it was examined that the existence of the void inside the propellant prepared with fine porous or hollow AP, and second it was investigated the burning characteristics of these propellants. The AP content of the propellant was 72wt% in this study. It was found that the propellants prepared with porous or hollow AP have the bubble contamination. The bubble would be inside porous or hollow AP particle because the void inside porous or hollow AP could not be charged with HTPB completely. The relationship between the burning rate and the weight mean diameter divides into two regions. The burning rate is almost constant above 19 μm and increases with decreasing weight mean diameter below that. This critical diameter did not depend on the void in AP particle. The burning rate of the propellant prepared with spherical AP was dependent on the weight mean diameter of AP. The burning rate of the propellant prepared with porous or hollow AP was not associated with the weight mean diameter and is larger than that of propellant prepared with spherical AP at the constant weight mean diameter. The increment of the burning rate increases with increasing void fraction. It is found that the void inside the porous or hollow AP particle has the positive effect on the burning rate.