摘要
开发了炸药烤燃热起爆仿真计算程序,烤燃求解器采用交替方向隐格式,起爆求解器采用5阶WENO格式进行计算,实现了炸药受热升温到起爆演化全过程数值仿真计算.使用的交替方向隐格式具有无条件稳定、受网格限制小、求解效率高的特点,烤燃计算中引入液相率β对炸药相变进行描述.以TNT炸药为研究对象开展慢烤热起爆数值模拟研究,得到了炸药局部温度演化和临界点火阈值,并给出相变对烤燃过程的影响规律.同时开展TNT慢烤实验,通过嵌入式热电偶传感器对程序进行了验证,仿真得到的温升曲线及相变平台与实验结果对比良好,证实了计算的可靠性.通过力-热-化耦合的模拟计算,给出了炸药受热后点火区域和演化规律,发现反应初始阶段由温度主导,随着反应进程发展转变为压力主导.
A simulation program for explosive ignition and detonation after cook-off was developed.The combustion solver was calculated by alternating direction implicit scheme,and the detonation solver was calculated by fifth-order WENO scheme.The numerical simulation of the whole process from ignition response to detonation evolution was realized.The alternating direction implicit scheme used was characterized by unconditional stability,low grid constraint and high solving efficiency.The phase transformation of explosive was described by using liquid fractionβ.The numerical simulation of initiation after cook-off of TNT was performed,by which the local temperature evolution and critical ignition threshold of explosive as well as the influence of phase transformation on the cook-off process were revealed.In the meantime,TNT cook-off experiment was carried out,and the program was verified by embedded thermocouple sensor.The simulated temperature rise curve and phase change platform coincided well with the experimental results,which validates the reliability of the calculation.The ignition region and evolution law of the heated explosive were revealed by simulation of mechanical-thermal-chemical coupling.It is found that temperature dominates the initial stage of reaction,and pressure dominates as reaction develops.
作者
王成
方钧宇
杨同会
WANG Cheng;FANG Junyu;YANG Tonghui(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2023年第5期485-492,共8页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(11732003)。
关键词
凝聚相炸药
慢烤
热点火起爆
无条件稳定算法
WENO格式
condensed explosive
slow cook-off
thermal initiation
unconditionally stable algorithm
WENO scheme
