三点起爆控制参数对尾翼爆炸成型弹丸成型的影响

Effects of three-point initiation control parameters on formation of explosively-formed projectiles with fins

针对三点起爆控制参数(起爆直径、起爆同步误差)对尾翼爆炸成型弹丸(explosively formed projectile,EFP)成型的影响问题,理论分析了三点起爆条件下爆轰波的马赫碰撞,计算获得了不同起爆直径下马赫波的相关参数,利用LS-DYNA有限元软件通过数值模拟研究了不同起爆直径下三点起爆同步误差对EFP尾翼成型及飞行速度的影响规律。结果表明,起爆直径越大,马赫波在药型罩上的作用面积越小,马赫超压越大,形成的EFP长径比和速度越大;起爆直径为30、40、50 mm三点起爆成型装药形成较佳尾翼EFP应满足的最大起爆同步误差分别为50、100、150ns;此外,尽量使中间起爆点起爆同步误差约为最大同步误差的一半,有利于降低尾翼EFP的侧向分速度,提高飞行稳定性。

Effects of the three point initiation control parameters on the formation of an explosively formed projectile （EFP） with fins were studied, including initiation diameter and initiation synchroni zation error. The Mach wave parameters （pressure and Mach wave domain area） at the metal liner were calculated theoretically at different initiation diameters. The fin formation and stable flight ve locity of EFP caused by the synchronization error at different initiation diameters were investigated by employing the I.S DYNA software. Results indicate that the Mach wave domain area decreases, but the pressure, final velocity and length to diameter ratio of the EFP increase, as the initiation diameter increases. It is noted that a better empennage formation can be approached when the initiation syn chronization errors at the initiation diameters of 30, 40, 50 mm are less than 50, 100, 150 ns, respec tively. In addition, the lateral velocity of theEFP is lower and the flight stability is higher when the delay time of the middle detonation point is about half the maximum delay time of the three initiation points.