炸药颗粒床中致密波状态方程研究

对一维两相流模型进行简化,引入颗粒守恒假设,建立了炸药颗粒床的定常致密波计算模型.分别使用Tait状态方程和Hayes状态方程,研究了致密波区内的压力、固相体积分数、固相密度、颗粒半径和颗粒数密度的分布.通过比较发现,使用Tait状态方程,固相密度、颗粒半径和颗粒数密度的分布以及它们之间的对应关系与活塞驱动颗粒床产生稳态致密波的过程不相符.结果还表明,大于颗粒材料音速的致密波(超音速致密波),波阵面存在间断;而小于颗粒材料音速的致密波(亚音速致密波),从波前到波后,所有物理参量光滑过度.分析得到了活塞速度、初始体积分数与各物理参量之间的关系.

Analysis on EOS of Steady Compaction Waves in Granular Explosive

By simplifying one-dimensional two-phase flow continuum mixture model and introducing the particle number conservation assumption, the computational model of steady compaction waves in granular explosive was established. This model could be used to predict final pressure, final volume fraction, solid density, and radius and particle number density in porous HMX material. Tait EOS and Hayes EOS were used to analyze steady compaction waves in porous energetic materials and it was revealed that the analysis of using Hayes EOS was more proper than that of using Tait EOS. It was found that there was a shock process for compaction wave travelling with supersonic speed, but no shock process existed for subsonic compaction wave. At last, the compaction wave speed, the final pressure, final volume fraction and compaction zone length were studied as the function of initial volume fraction and piston velocity.