圆柱壳体装药偏心多点起爆下破片速度的分布  

Velocity distribution of fragments resulted by explosion of a cylindrical shell charge on multi-spots eccentric initiation

作　　者：沈慧铭 李伟兵[1] 王晓鸣[1] 李文彬[1] 董晓亮[1] 

机构地区：[1]南京理工大学智能弹药技术国防重点实验室,江苏南京210094

出　　处：《爆炸与冲击》2017年第6期1039-1045,共7页Explosion and Shock Waves

基　　金：国家自然科学基金项目(11202103)

摘　　要：针对偏心起爆战斗部破片速度增益的问题,提出爆轰波碰撞形成马赫超压是引起破片速度增加的原因。利用AUTODYN软件,模拟偏心起爆战斗部从壳体径向膨胀、表面产生裂纹到最后形成破片的整个过程,并将模拟得到的破片速度与实验数据对比,两者吻合较好;简化Whitham方法并结合Gurney速度公式得到偏心起爆战斗部定向破片速度和定向区域的计算方法,同时在保证破片初速的前提下,研究偏心多点起爆下起爆点数的选择标准。研究结果表明:偏心多点起爆下定向破片初速增益约34%,定向区域范围约30°,起爆点数的选择与壳体长度和装药口径相关。To address the issue of the increase of the fragment velocity of an eccentric initiation warhead,we put forward the view that this increase was caused by the Mach overpressure formed by the detonation wave collision. We used the AUTODYN software to simulate the whole explosion process of the eccentric initiation warhead,from the radial expansion of the shell to the formation of the surface cracks,and eventually the formation of the fragments. We then compared the simulation result of the fragment velocity with the test data and found that they were in good agreement. Further we combined the simplified Whitham method with the Gurney equation to obtain the calculation method of the directional fragment velocity and directional area of the eccentric initiation warhead. We studied the selection criteria for the number of the initiation spot on the premise of maintaining the fragment velocity. The results show that through the multi-spot eccentric initiation,the velocity of the directional fragment increases by about 34%,and the directional area range is approximately 30°; the selection criteria of the number of initiation spot is associated with the shell length and the charge diameter.Our study can provide a reference for the engineering application of multi-spot initiation eccentric warhead.

关 键 词：定向战斗部 马赫反射 偏心多点起爆 破片初速 

分 类 号：O383[理学—流体力学]