DNAN基熔铸炸药的慢烤相变及传热特性  

Phase Transition and Heat Transfer Characteristics of DNAN Based Melt-cast Explosive in Slow Cook-off Test

作　　者：王帅 智小琦[1] 王雪 周捷 WANG Shuai;ZHI Xiao-qi;WANG Xue;ZHOU Jie(School of Mechanical and Electrical Engineering,North Unversity of China,Taiyuan 030051,China)

机构地区：[1]中北大学机电工程学院

出　　处：《火炸药学报》2019年第4期396-402,共7页Chinese Journal of Explosives & Propellants

基　　金：国家安全重大基础研究项目

摘　　要：为了解DNAN基熔铸炸药慢烤相变及传热特性,进而对其安全使用提供技术支持,对药柱尺寸为Φ30mm×60mm的DNAN基熔铸炸药进行了慢烤实验,分析了DNAN基熔铸炸药的热响应特性;用数值模拟方法对Φ30mm×60mm的DNAN基熔铸炸药进行二分之一和全模型相变及传热对比分析。实验结果表明,DNAN基熔铸炸药相变开始温度Ts及相变结束温度Te分别约为81.8℃和95.3℃;响应等级为燃烧反应;通过数值模拟得到弹体竖直放置时点火位置在药柱顶部靠近边缘处,点火温度Tr约为203.8℃;相变过程中主要传热方式由热传导转变为对流传热导致相变区域的不对称分布,因此在DNAN基熔铸炸药慢烤数值模拟中应采用全模型;相变过程中DNAN基熔铸炸药的密度和导热系数减小,因此DNAN基熔铸炸药相变速率经历了快速、速率为零、中速和低速4个阶段。To understand the slow cook-off phase transition and heat transfer characteristics of DNAN based melt-cast explosives, and provide technology support for their safe use, the cook-off experiment of DNAN-based explosive grain with size of 30 mm×60 mm was conducted, and the thermal response characteristics was analyzed.The numerical simulation method was used to contrast the phase transition and heat transfer process of Φ30 mm×60 mm DNAN based melt-cast explosive between the half model and full model.The experimental results showed that the initial temperature of phase transition T s and the end temperature of phase transition T e of DNAN based melt-cast explosive were about 81.8℃ and 95.3℃, respectively.Response level was combustion reaction.Through numerical simulation, it was found that the ignition position of DNAN based melt-cast explosive was near the edge of the top of the explosive grain and the response temperature T r was about 203.8℃ when the explosive grain was placed vertically.The main heat transfer mode in phase change process changed from heat conduction to asymmetric distribution in phase-change region resulted from thermal convection.So the full model should be employed in slow cook-off numerical simulation of DNAN based melt-cast explosive.The density and thermal conductivity of DNAN based melt-cast explosive decreased during phase transition.So the phase transition rate of DNAN based melt-cast explosive experienced four stages:fast velocity, zero velocity, medium velocity and low velocity.

关 键 词：物理化学 DNAN基熔铸炸药 慢烤 相变 传热特性 数值模拟 烤燃实验 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O64[理学—物理化学]