基于20L球形爆炸装置的微米级铝粉爆炸特性实验

采用20 L球形爆炸装置，对6种不同粒径分布的微米铝粉在不同浓度下的爆炸特性进行了实验研究，考察了浓度和粒径对铝粉爆炸特性的影响规律，并分析了其爆炸产物的表面特征.结果表明，铝粉的最大爆炸压力、压力上升速率和爆炸指数随铝粉浓度的增加呈抛物线变化，在最适爆炸浓度（c_opt=500g/m3）时三者均达到峰值.随着铝粉粒径的减小时，最大爆炸压力、压力上升速率呈指数增加趋势，且在铝粉粒径小于10μm时，其增幅更为显著.爆炸过程中的铝粉粉尘云的燃烧时间随铝粉浓度的增大呈指数规律衰减并趋于平缓，同时随着铝粉粒径的减小而降低. 

Explosion Characteristics of Micro-Aluminum Powders in 20 L Spherical Vessels

Aluminum powder is an important mental industrial raw material, it is significant to prevent aluminum dusts explosion effectively. Explosion experiments were carried out for six micro-aluminum powders with different particle sizes in different concentrations by using 20 L spherical vessel to investigate the effects of aluminum dust concentration and particle size on explosion characteristics, and the explosion products were also analyzed. The results show: the maximum explosion pressure, the rate of pressure rise and explosion index all vary with dust concentration increasing, and their curves are parabola and reach the peak value in optimum concentration which is 500g/m3. The maximum explosion pressure and the rate of pressure rise both rise with aluminum dust particle size decreasing, and their curves are exponential. They increase rapidly when particle sizes less than 10μm. The combustion time in explosion of dust cloud decreases as aluminum dust concentration increasing, and gradually trends to flat, besides its curve is exponential. The combustion time of aluminum powders decreases with aluminum dust particle size decreasing.