为研究铝粉粒度对RDX基含铝炸药水中爆炸近场特性的影响,采用转镜式高速扫描相机对含30％(质量分数)微米铝粉、20％(质量分数)微米铝粉与10％(质量分数)亚微米铝粉的2种RDX基含铝炸药水下近场爆炸过程进行了观察记录,获得了沿装药径向的爆炸冲击波传播轨迹扫描底片。通过对2种含铝炸药水中近场爆炸扫描底片进行判读分析,获取了沿装药径向的爆炸冲击波传播迹线与爆轰产物膨胀迹线,由此分析得出2种含铝炸药爆炸冲击波传播速度、波阵面压力和爆轰产物气泡的膨胀位移等参数的变化规律,并对2种含铝炸药相关参数进行了对比分析。结果表明,在10％(质量分数)微米铝粉替换为亚微米铝粉后,含铝炸药冲击波的初始传播速度及波阵面压力减小且能量衰减速率也降低,冲击波传播距离为40 mm左右时,2种炸药的阵面压力便较为相近,并且在爆轰产物气泡膨胀阶段,由于亚微米铝粉反应较快,其释放的能量导致气泡膨胀速率增长较快。%In order to investigate the effect of particle size of aluminite powder on the characteristic of underwater near field explosion of RDX-based aluminized explosives, the scanning photographs along the radial of the two charges, the one containing 30% ( mass fraction) micron aluminum and the other containing 20% ( mass fraction) micron aluminum and 10% ( mass fraction) submicron aluminum, were obtained by a high speed scanning camera. Photographs about under-water explosion of the two different aluminized explosives have been analyzed, and the shock wave curves and expand curves of detonation products were derived. Furthermore, the change rules of shock waves propagation velocity, shock front pres-sure and expansion of detonation products of the two aluminized explosives were investigated, and also the parameters of two aluminized explosives were compared. Results show that, after 10% ( mass fraction) micron aluminum is substituted by submicron aluminum, the initial shock waves pressure propagation velocity and shock front pressure of the aluminized explo-sive become smaller, and the energy attenuation rate is also decreased. When propagation distance of shock wave is about 40 mm, front pressures of the two explosives are relatively close . At the bubble expansion stage, the submicron aluminum has a high reactive characteristic, leading to a fast increase rate in the detonation products expansion because of its released energy.
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