铝粉燃烧对 CL-20 基混合炸药水下爆炸载荷特性的影响

The energy supply mechanism of aluminum powders of the aluminized explosives on the underwater explosion load in the long-time sequence combustion process is studied. The comparison experiments of underwater explosions of aluminized explosives and lithium fluoride-containing explosives are made based on the underwater explosion tank. The influence of aluminum powder combustion on the shock wave and bubble load is analyzed. The results show that the combustion of aluminium powders in CL-20-based mixed explosives releases a large amount of energy,increases the peak shock wave pressure and shock wave energy,and reduces the decay rate of the shock wave. Compared with lithium fluoride-containing explosives,the aluminium powder in CL-20-based aluminized explosives has a higher flame brightness due to its afterburning reaction during explosion,and the afterburning reaction time of the aluminium powder is more than 1 ms. The combustion of aluminium powder can increase the maximum radius of the bubble, bubble pulsation period and bubble energy. The maximum bubble radius of CL-20-based aluminized explosives is 11. 89% higher than that of CL-20-based lithium fluoride-containing explosives,and the first bubble pulsation period is increased by 25. 74%. CL-20-based aluminized explosive reaches its maximum radius with a delay of 5. 20 ms compared to CL-20-based lithium fluoride-containing explosives. In addition,the rate of change of the bubble pulsation radius of aluminized explosives is higher than that of lithium fluoride-containing explosives due to the continuous energy supply of aluminum powder at the bubble pulsation stage. Moreover, the contraction rate of bubble is reduced, and the duration of the contraction phase of bubble is increased. It is shown that the bubble pulsation process of aluminized explosives has “asymmetry” in time.