在以DNAN为基的熔铸炸药的烤燃过程中,DNAN会发生熔化,影响炸药的热响应规律。为研究DNAN熔铸混合炸药在热烤条件下的热响应规律,采用多点测温的实验方法,对尺寸为Φ30mm×60mm的熔铸混合炸药在不同升温速率条件下进行烤燃实验。结果发现,炸药发生相变时各监测点的温度都随升温速率的变化而发生变化。为研究这一变化规律,建立了烤燃弹的三维计算模型,并用Fluent对不同升温速率下的烤燃行为进行了数值模拟计算。结果表明:升温速率对炸药发生相变和响应时的温度、点火位置都有较大影响。随着升温速率的增大,炸药发生相变和响应时的温度都呈升高趋势,其中,炸药发生相变时的温度随升温速率的增大呈对数升高。炸药的点火位置也从药柱中心移到药柱表面,对炸药反应的剧烈程度产生影响。

During the cook-off of the DNAN-based casting explosives, DNAN will melt, affecting the thermal response of explosives. In order to study the thermal response of DNAN casting mixed explosives under cook-off conditions, casting mixed explosive with the size of Φ30 m×60 m was used for cook-off test out at different heating rates with the method of multi-point temperature measurement. It was found that the temperature of each monitoring point changed with the change of heating rate. In order to study the law of this change, a three-dimensional calculation model of explosives was established and the cook-off behavior under different heating rate was numerically simulated by Fluent. The results show that the heating rate has a great influence on the temperature and ignition position of the explosive phase change and response. With the increase of the heating rate, the temperature of the explosive phase change and the response showed an increasing trend. The temperature at which the explosives undergo phase change was increased logarithmically with the increase of the heating rate. The ignition location of the explosive also moved from the center to the surface of the explosive, affecting the severity of the reaction.