Thermal self-ignition simulation of pyrotechnic composite in different conditions

the combustion and explosion accidents of pyrotechnic composite occur frequently. the study on the thermal hazard of large size of pyrotechnic composite by experiment method is dangerous. it would consume huge manpower and material resources. in this paper, a study was conducted to investigate the thermal hazards of pyrotechnic composite under different ambient temperature, size and packing condition by numerical simulation method. the results show that the thermal hazards of pyrotechnic composite increase with the increase in ambient temperature. the ignition temperature of pyrotechnic composite as the inherent property of pyrotechnic composite is not affected by packing condition and size. in the same conditions, the lower thermal conductivity of packing material is, the lower sadt of pyrotechnic composite is. with the increase in the size of the grain, its sadt decreases and ignition delay period shortens, and the ignition position shifts from the center to the top of the grain with lower thermal conductivity of packing material.