基于三维离散元方法研究热点的位置和温度对奥克托今颗粒点火燃烧的影响

炸药的点火燃烧特性与炸药的安全和使用密切相关，其一直是研究者重点关注的问题之一.普遍认为，凝聚炸药起爆的关键是热点.基于此，本文采用三维离散元方法，以奥克托今(HMX)颗粒为研究对象，探究了HMX颗粒中不同位置和初始温度的热点对其燃烧过程的影响.结果发现，热点的不同初始温度和位置都会对HMX炸药颗粒的燃烧特性造成影响.由于处于炸药内部分散位置的热点表面积较大，其相比集中的热点更有利于HMX炸药颗粒的起爆.并且研究发现，并不是热点的温度越高越有利于炸药的起爆，这也取决于炸药颗粒的含量.本文的研究工作对炸药的实验研究以及军事应用提供了一定的参考.

The effect of the location and temperature of hot spots on the combustion of granular HMX based on the three-dimensional discrete element method

The ignition and combustion characteristics of explosives are closely related to the safety and use of explosives, which has always been one of the key concerns of researchers. It is generally believed that the key to the detonation of condensed explosives is the hot spot. Based on this, this paper uses the three-dimensional discrete element method to study the effects of hot spots in different positions and initial temperatures on the combustion process of granular cyclotetramethylenete-tranitramine (HMX). The results show that different initial temperatures and positions of hot spots will affect the combustion characteristics of HMX explosive. Due to the large surface area of the hot spots located in the dispersed position inside the explosive, it is more conducive to the detonation of HMX explosive than the concentrated hot spots. It is not found that the higher the temperature of the hot spot, the more conducive the detonation of explosives, which also depends on the content of explosives. The research work in this paper provides a certain reference for the experimental research and military application of explosives.