偏心起爆对战斗部装药能量分配增益的影响

为研究不同方式的偏心起爆对炸药装药能量分配及增益的影响，建立了偏心起爆战斗部的计算模型，通过局部装填比这一变量，给出了偏心起爆战斗部破片的初速计算公式。采用数值模拟与试验验证结合的方法，对六分位条件下不同偏心起爆方式的破片速度增益和能量增益进行了对比，得出以中心起爆为基准，分别以邻位双线、连位三线、间位双线、偏心单线方式起爆，定向方位内破片的速度增益依次增大；邻位双线起爆时，目标方向破片速度增益达25.47%，定向区域破片动能占总能量的24.57%，能量增益超过40%。

Influence of eccentric initiation on energy distribution gain of a warhead charge

In order to study the influence of different ways of eccentric initiation on the energy distribution and the gain of explosive charge, a theoretical model of eccentric initiation warhead is established, and the concept of energy distribution center is introduced. By introducing the variable of local loading ratio, the calculation formula of initial velocity of fragments of eccentric initiation warhead is formulated. In this paper, the velocity gain of fragments and energy gain with different initiation modes under the sextile condition are compared and analyzed by using numerical simulation and experimental verification. The results show that at the directional orientation, the maximum pressure at the edge of multi-line eccentric initiation is significantly greater than that of eccentric single line initiation and central initiation, and the detonation pressure at the edge of charge increases from 23.5 GPa of central initiation to 36.2 GPa of asymmetrical two lines 60° initiation; The distribution law of fragment velocity in the direction of 0°?30° is similar to the distribution law of maximum pressure at the edge of charge. Taking the central initiation as the benchmark, the relationship of velocity gain with the directional orientation takes the following relation: asymmetrical two lines 60°>asymmetrical three lines 120°>asymmetrical two lines 120°>asymmetrical one line. When asymmetrical two lines 60° initiation, the fragment velocity gain in the target direction is 25.47%. Finally, through the verification of experiments and theoretical calculation, it is concluded that the energy proportion in the directional area of adjacent asymmetrical two lines 60° is the highest, with the energy gain in this area being 47.42%; followed by asymmetrical three lines 120einitiation, with the energy gain being 38.84%; then symmetrical two lines 1202initiation, with the energy gain being 36.98%; and finally asymmetrical one line initiation, with the energy gain in the directional area being 32.72%.