接触爆炸和近距离爆炸比冲量数值仿真研究

For contact explosion and close-in explosion, blast load distribution will be effected by the shape of explosive, the location of detonation point and product injection, which poses difficulties to theoretical analysis and engineering application. In order to study the specific impulse generated by contact explosion and close-in explosion, numerical simulations were made using the fluid-solid coupling method and PBM method according to a close-range explosive experiment done by Nansteel. The results showed that the simulation of the PBM model agreed well with the experimental results, while the fluid-solid coupling simulation results were only about 70% of the experimental values. The simulation results of contact explosion of isometric diameter ratio TNT column showed that the center point's specific impulse changed linearly with the diameter. The change of the core distance mainly affected the specific impulse within the 6 cm radius of the target center point when 640 g and 1 250 g TNT columns were used. Based on dimensional analysis, the empirical formula of specific impulse was obtained.