Shock Interaction of Metal Particles in Condensed Explosive Detonation

摘要

Three-dimensional mesoscale modeling is conducted to study the two-phase momentum and heat transfer during shock and thin-detonation-front interaction with metal particles in liquid nitromethane under various particle packing configurations and inter-particle spacings. The results showed that the particle velocity after the shock is a strong function of material density ratio of liquid to metal and volume fraction of particles. In the detonation case, it also depends on the expansion rate of the detonation products. The pressure at the leading edge of particles in a closely-packed particle bed achieves more than twice that of the theoretical 1D transmission pressure and the corresponding fluid temperature reaches 3828 K, providing hot spots that are responsible for detonation propagation in these heterogeneous explosives.