摘要
为了解DNTF凝固过程的微观特性,采用ProCAST软件热传导模块对DNTF凝固过程温度变化进行了模拟计算;采用高级缩松模块对DNTF凝固过程显微疏松进行了数值模拟,并进行了试验验证,获得了DNTF凝固过程中3个测点处的温度曲线和整体显微疏松CT测试结果。结果表明,DNTF凝固过程温度变化符合S型曲线变化规律,采用Logistic函数拟合的平均相关系数为0.997,温度计算结果与试验结果一致,平均误差约为5%;DNTF凝固过程显微疏松数值模拟结果与试验结果相符,显微疏松具有范围广泛、位置无规的分布特点,凝固条件、过冷度及枝晶结构是导致显微疏松产生的重要影响因素。
In order to understand the micro characteristics of DNTF solidification,the solidification temperature of DNTF was numerically calculated by using the thermal conductivity module of the ProCAST software.The distribution of microporosity of DNTF was simulated by the advanced porosity module based on the solidification temperature and the simulation results were vertified by the experiment.The temperature curves at three different positions of the sample during the solidification of DNTF were achieved and the microporosity were characterized by using CT.The results show that the solidification temperature of DNTF agrees well with the S-shape laws and the average adjusted R-square of Logistic function fitting is 0.997.In addition,the simulated solidification temperatures are in good coincidence with the experimental results with an average error of about 5%,and the calculated porosities are in good consistent with the test results.The distribution of micro pores in DNTF in the solidification process is wide and random,and the solidification condition,undercooling character and dendrite morphology contribute to the formation of micro pores.
作者
刘瑞鹏
贾宪振
王永顺
LIU Rui-peng;JIA Xian-zhen;WANG Yong-shun(Xi′an Modern Chemistry Research Institute,Xi′an 710065,China)
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2019年第5期485-489,I0004,共6页
Chinese Journal of Explosives & Propellants
基金
国防科工局国防基础科研项目
