周向六线起爆下杀伤战斗部的破片飞散特性

Fragment Dispersion Characteristics of Fragmentation Warhead under Circumferential Six-line Initiation

为简化起爆结构,提高引战系统可靠性,采用定向战斗部已有的周向六线起爆方式替代中心起爆,基于流体动力学理论对周向六线起爆下爆轰波的碰撞进行了理论分析,采用LS-DYNA进行了数值计算,并开展了战斗部样弹静爆试验。结果表明,相较于中心起爆,周向六线起爆条件下破片加速历程与其所在周向位置存在关联,并出现二次加速现象;在相邻起爆点对称面附近产生马赫爆轰波,局部压力可达44.2GPa,并在战斗部中心汇聚,中心处压力可达100GPa以上;轴向多点起爆改善了端面稀疏波的影响,破片速度得到提升,轴向破片速度一致性明显提高;破片飞散初速数值计算与试验结果误差在8.1%以内,不同区域破片初速增益可达4.6%~9.9%。表明周向六线起爆模式是替代定向杀伤战斗部中心起爆模式的有效途径。

In order to simplify the initiation structure and improve the reliability of the fuse warhead matching system,the circumferential six-line initiation method of directional warhead was proposed to replace the central initiation.Based on the theory of fluid dynamics,the impact of the detonation wave under the circumferential six-line initiation was analyzed.Numerical simulation was carried out by LS-DYNA and warhead static explosion test was performed.The results show that,compared with the central initiation,the acceleration process of the fragment under the circumferential six-line initiation is related to the circumferential position,and there is a secondary acceleration process;Mach detonation waves are generated near the symmetry plane of adjacent detonation points,with a local pressure of up to 44.2GPa and covering at the center of the warhead,and the pressure is over 100GPa at the center.The influence of the end face sparse wave is weakened by the axial multi-point initiation,the fragment velocity is increased,and the consistency of the axial fragment velocity is obviously improved.The accuracy of the numerical simulation is verified by warhead sample test,and the dispersion velocity error of fragment is within 8.1%,the initial velocity gain of fragments in different regions can reach 4.6%to 9.9%,indicating that the circumferential six-line initiation mode is an effective way to replace the central initiation of warhead.