A numerical investigation on double front detonation in solid explosive mixture with varying aluminum concentration
The performance characteristics of the aluminized high explosive is considered using the various aluminum (Al) concentration in the hybrid non ideal detonation model. Since there exist differences in the time scales of the characteristic induction and combustion of high explosives and Al particles, the process of energy release behind the leading detonation wave front occurs over an extended period of time. Subsequently, the decrease in detonation velocity with increasing Al concentration and the double front detonation (DFD) feature when anaerobic Al reaction occurs behind the front are the two cardinal observations reported. In order to simulate the performance characteristics associated with varying Al concentration within HMX base charge, the multiphase conservation laws are formulated for mass, momentum, and energy exchange between Al particles and HMX product gases. Here, two phase model (KV model) [1] is implemented into a hydrocode that simulates a series of unconfined and confined rate stick tests. The simulated results are compared with the experimental data for 5 25% concentrations [2] and the formation of DFD structure under varying Al concentration (0 50% in HMX is investigated.