论文部分内容阅读
基于标准20 L球形爆炸装置,系统研究了6种不同粒径微米级铝粉的爆炸特性,并结合SEM和XRD对爆炸产物的微结构特征进行了分析。研究结果表明,相同粉尘浓度条件下爆炸超压与颗粒粒径表现为二次函数的关系,而爆炸超压上升速率则随着粒径的减小按指数增加;颗粒的燃烧时间与颗粒的粒径均表现为沿幂函数增加;相同粉尘浓度条件下细颗粒铝粉爆炸过程主要受氧气扩散的控制,而大颗粒铝粉颗粒的爆炸过程则主要受铝粉颗粒的熔融控制。
Based on the standard 20 L spherical explosive device, the explosion characteristics of 6 micron-sized aluminum powders with different grain sizes were systematically studied. The microstructural characteristics of the explosive products were analyzed by SEM and XRD. The results show that under the same dust concentration, the overpressure and the particle size of the blast furnace show a quadratic function, while the rate of explosion overpressure increases exponentially with the decrease of the particle size. The burning time of the particles and the particle size of the particles The mean diameter of the particles is increased along the power function. The explosion process of the fine particles of aluminum powder under the same dust concentration is mainly controlled by the diffusion of oxygen, while the explosion of the large particles of aluminum particles is mainly controlled by the melting of aluminum particles.