冲击波诱导形成颗粒射流的实验研究

颗粒材料在冲击波的作用下会形成射流状的结构.基于准二维的实验平台，观察了颗粒环在中心径向冲击载荷的作用下，内部射流的形成过程.发现射流是由颗粒环内表面产生然后发展到颗粒环外表面形成外部射流.当加载压力变化时，射流的形态、尺寸和分布也会发生变化，而早期内部射流的数量基本不变，随着加载压力增大，后期的内部射流数量逐渐降低.其原因是加载压力越大，射流分布越不均匀，在颗粒环运动的过程中，尺寸较大的射流会与周围的小射流合并，从而使射流数目大大减少.

Experimental Studies of Shock Induced Particle Jetting

The dispersion of a cylindrical ring by a shock wave takes the shape of particle jets. Based on the quasi-two-dimensional experimental platform, the formation of particle jets in the inner surface of the particle ring is observed. It is found that the jets is generated by the inner surface of the particle ring and then develops to the outer surface. When the impulsive loads change, the shape and distribution of the jets change too. The number of early internal jets is basically the same. As the impulsive loads increase, the number of late internal jets decrease gradually. When the impulsive loads become greater, the distribution of particle jets will be more uneven, and the larger jets will merge the surrounding smaller ones during the dispersion of the particle ring, which leads to the decrease of the number of jets.