DNAN炸药凝固过程的实验与数值模拟  

Experiment and Numerical Simulation of DNAN Solidification Process

作　　者：马松[1] 袁俊明[1] 刘玉存[1] 常双君[1] 王建华[1] 

机构地区：[1]中北大学化工与环境学院,山西太原030051

出　　处：《含能材料》2014年第2期240-244,共5页Chinese Journal of Energetic Materials

基　　金：火炸药青年基金(08020401-4)

摘　　要：为了解2,4-二硝基苯甲醚(DNAN)的凝固过程,用布拉格(Bragg)光栅对其凝固过程的中心轴线温度场进行了测试。考虑了液相自然对流的微观现象。用控制容积法计算了DNAN凝固过程的温度场、流场和相界面位置。用临界固相率和补缩距离结合法预测了缩孔编松的生成。结果表明,DNAN在96℃附近出现温度滞后现象,中心部位最明显。前期液相自然对流的最大速度可达10-3量级(m·s-1),其作用为传质和加速凝固进程。无冒口补缩条件下,DNAN凝固过程中相界面呈"V"字型向顶部迁移、收缩,凝固后中心轴线上有连续的缩孔分布,中心处的最大孔隙率为0.38。o understand the solidification process of 2,4-dinitroanisole（ DN AN）,the temperature field in the central axis in the solidification process w as tested by Bragg gratings. T he microscopic phenomenon of natural convection of liquid phase w as considered. T he temperature field,flow field and phase interface position for the solidification process of DN AN w ere calculated by volume-control method. T he formation of shrinkage holes and shrinkage porosities w ere predicted by considering both critical solid phase fraction and feeding length. R esults show that the temperature hysteresis appears at about 96 ℃ and most obvious in the center. T he maximum velocity of natural convection of the early stage of liquid reaches 10-3magnitude（ m·s^-1）. This natural convection helps to transfer mass and to accelerate the process of solidification. U nder no feeding conditions,the phase interface in the solidification process of DN AN is V-shaped,it shrinks and transfers from bottom to top. After contraction and solidification,the shrinkage holes distribute continuously in the central axis of explosive,and the maximum porosity in the center is 0. 38.

关 键 词：材料科学 2 4-二硝基苯甲醚(DNAN) 凝固 BRAGG光栅 数值模拟 

分 类 号：TQ560.1[化学工程—炸药化工]