Reflection behavior of insensitive explosive detonation propagating around a cylinder  

钝感炸药爆轰波绕圆柱体传播行为研究

作　　者：Zixuan Zhang Yuan Wang Xiaomian Hu Haitao Chen 张子瑄;王元;胡晓棉;陈海涛(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China [2]Graduate School of China Academy of Engineering Physics,Beijing 100088,China

出　　处：《Acta Mechanica Sinica》2024年第7期55-65,共11页力学学报（英文版）

摘　　要：Insensitive explosive detonation has wide applications in compressing and driving inert materials,and thereby the interaction between detonation and inert materials has received more attention.In this paper,a two-dimensional numerical simulation based on the Euler multiphase flow framework is used to investigate the reflection behavior of the insensitive explosive detonation propagating around a cylinder.The results show that there is a critical incident angle,defined as transition angle for detonation propagating around the cylinder,below which the regular reflection(RR)on the cylinder surface is observed.When the incident angle is greater than the transition angle,RR changes to Mach reflection.This transition angle is larger than that obtained by polar curve theory and the change of incident angle is used to interpret above phenomenon.In addition,the influence of cylindrical radius and detonation reaction zone width on the reflection behavior is examined.As the cylindrical radius increases,the height of Mach stem increases while the transition angle decreases and gradually approaches the value in pole curve theory.Von Neumann reflection is observed when the reaction zone width is relatively small.This is because the energy release rate in the reaction zone is high for small reaction zone width,resulting in the formation of a series of compression waves near the cylindrical interface.钝感炸药爆轰被广泛应用在压缩和驱动惰性材料领域,爆轰与惰性材料间的相互作用受到越来越多的关注.本文采用基于欧拉多相流框架的二维数值模拟程序,研究钝感炸药爆轰波绕圆柱体传播过程的反射特性.研究结果表明,存在临界入射角,当入射角小于临界入射角时,爆轰波绕圆柱传播时在圆柱体表面发生规则反射;当入射角大于临界入射角时,圆柱体表面的规则反射变为马赫数反射,该临界入射角被定义为反射过渡角.极曲线理论获得的反射过渡角明显小于计算结果,该现象可以通过爆轰波绕圆柱传播过程中入射角的变化解释.此外,本文评估了圆柱半径和爆轰波反应区宽度对反射特性的影响.增大圆柱半径可以增大马赫杆高度,减小反射过渡角.随着圆柱半径的增大,反射过渡角逐渐接近极曲线理论值.当反应区宽度较小时,圆柱表面形成冯诺依曼反射,这是因为反应区宽度越小,反应区能量释放率越高,从而导致圆柱表面附近形成一系列压缩波.

关 键 词：Insensitive explosive detonation Cylindrical inert material Reflection behavior 

分 类 号：O38[理学—流体力学]