破片撞击高能推进剂装药爆燃机理实验研究

To reveal the mechanism of deflagration formation in high-energy propellant charge subjected to fragment impact,the semi-perforation and penetration of fragments into high-energy propellant charges are tested. The response types of charge are combustion-to-deflagration transition,combustion and deflagration. Based on the time-series image of charge reaction evolution and recovered samples,the response process of charge is comprehensively characterized using the image digital processing technology. The mechanical deformation and charge response characteristics of propellant after penetration are analyzed, and the deflagration mechanism of charge during semi-perforation and penetrating is revealed. The results indicate that,the trajectory penetration damage of the high-energy propellant charge impacted by a tungsten alloy fragment with a diameter of 10 mm is local radial cracking,and is accompanied by a delayed deformation caused by viscoelastic dissipation. There is a delayed reaction of the charge during semi-perforation and penetrating. that is,the significant combustion reaction of the charge occurs after the failure of propellant structure. During semi-perforation,the delayed deformation causes the high-intensity reaction zone inside the charge to move forward and coupled with structural constraints,resulting in combustion to deflagration transition. The charge is difficult to undergo deflagration reaction when delayed deformation and delayed reaction are significantly present in the penetrating state. When the combustion gas inside the crater seeps into the unreacted condensed phase propellant through the radial cracks of penetration trajectory, the charge usually undergoes a deflagration reaction.