Li Yongshen, Zhao Xue, Rui Jiuhou, Xu Sen, Chang Shengquan, Zhai Lizhe, Qiu Siqi, Li Yuanyuan
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Materials (Basel). 2022 Mar 25;15(7):2438. doi: 10.3390/ma15072438.
In order to analyze the influence of nitroguanidine (NQ) spheroidization on the corresponding characteristics of slow cook-off molten cast explosives, experiments and simulation calculations were carried out. A calculation method was established, based on a multiphase flow model to simulate the response process of spherical NQ-based molten cast explosives under slow cook-off conditions, to analyze the temperature distribution and liquid phase distribution during the reaction process, and to discuss the reaction temperature, reaction time and reaction location with the change of solid content. The study found that the slow cook-off response level of spherical NQ-based molten cast explosives is deflagration; the phase change cloud diagram can be used to determine the ignition time to obtain more accurate slow cook-off response data; when the solid content is 50%, the ignition temperature of ordinary NQ-based molten cast explosives is 454.3 K, and the ignition time is 50.0 h, while the slow-baking ignition temperature of spherical NQ-based fused-cast explosives is up to 464 K, which is an increase of 2.14%, and the ignition time is 51.8 h, which is a relative increase of 3.55%; it can be seen that the spheroidization of NQ improves the thermal safety of molten-cast explosives has a significant effect.
为分析硝基胍（NQ）球化对慢烤燃熔铸炸药相应特性的影响，开展了实验与模拟计算。基于多相流模型建立了一种计算方法，用于模拟球形NQ基熔铸炸药在慢烤燃条件下的响应过程，分析反应过程中的温度分布和液相分布，并探讨随着固体含量变化的反应温度、反应时间和反应位置。研究发现，球形NQ基熔铸炸药的慢烤燃响应水平为爆燃；相变化云图可用于确定点火时间以获得更准确的慢烤燃响应数据；当固体含量为50%时，普通NQ基熔铸炸药的点火温度为454.3 K，点火时间为50.0 h，而球形NQ基熔铸炸药的慢烤燃点火温度高达464 K，提高了2.14%，点火时间为51.8 h，相对增加了3.55%；可见NQ球化对提高熔铸炸药的热安全性有显著作用。
