【作者】 王明扬； 吴艳青； 黄风雷； 黄明；

【Author】 WANG Ming-yang;WU Yan-qing;HUANG Feng-lei;HUANG Ming;Beijing Institute of Technology;Institute of Chemical Materials,CAEP;

【机构】 北京理工大学机电学院； 中国工程物理研究院化工材料研究所；

【摘要】 对落锤撞击观测系统进行进一步改进,利用高速摄影仪拍摄了RDX颗粒在落锤撞击加载下的动态响应过程。研究了在低速撞击下RDX经历的形态变化、熔化、点火、火焰传播的影响。发现RDX颗粒炸药受低速撞击后,在经历激烈的破碎变形之后,其熔化和局部分解反应相互影响,导致局部溅射。在点火成长为燃烧的过程中,可以由图像中火焰传播获得反应剧烈程度的信息。不同的落锤下落高度,试样所经历的塑性扩展时间越长;所累积的不可恢复塑性能量越多,越容易发生点火现象。火焰传播速度不仅反映出局部热点长大速度,而且体现了反应剧烈程度。对两组颗粒间距不同的RDX进行30cm高度撞击,发现,间距越小,能量越易于集中在中心处,使中心部位压力越高,越易于发生剧烈溅射或点火燃烧。更多还原

【Abstract】 The dynamic responses of RDX particles in response to the drop-weight impact were captured by a high-speed camera using the optimized drop-weight experimental system. Image analyses were carried out on morphology, melting, ignition as well as flame propagation. It has been found that local melting and chemical decomposition influenced each other after violent breakage of RDX particles, which resulted in local jetting. During the hot-spots growth to burning, intensity extent of reaction can be acquired from image processing. Observation showed that with the increased falling height, the duration of plastic expansion became longer. The more the irreversible dissipated energy accumulated, the easier the ignition reaction occurred. Image processing provided flame front propagation velocity during hot-spots growth to global burning. The flame propagation velocity not only reflects growth rate of local hot spots, but also embodies the violence of reaction. Two groups of experiments were performed on four RDX particles with different spacing. It showed that the smaller distance of RDX particles, the more energy concentrated in the center. Interactions among particles will lead to higher speed jetting and ignition possibility.更多还原