Three-dimensional Finite Difference Model of Simulating the Process of Laser Ignition of Explosive
ZHOU lin, LIU Hong-ming, XU Geng-guang (LAB of prevent and control of explosion disaster, Beijing Technolgy of institute, Beijing100081, China)
Based on the mechanism of thermal ignition of energetic materials, a three-dimensional finite difference model describing the process of laser ignition of explosive is established. With the help of this method, the growth process of surface temperature of RDX, HMX and PETN samples and composite B ignited by laser beam and contour of temperature in the samples and explosion induction time of samples are obtained by numerical simulation method. The results show that the calculated values of induction time obtained by three-dimensional model are in agreement with the experimental data. The temperature growth mainly takes place in the surface layer of cylindrical sample irradiated by laser. The beam radius and pulse width of laser and absorption coefficient of the investigated samples to laser are some principal factors affecting the ignition energy threshold.
【CateGory Index】： TQ560