爆炸驱动燃料抛散的非理想化特征

利用LS-DYNA对燃料空气炸药(FAE)装置中心装药不耦合系数(De)的最佳值、中心装药偏移和壳体单侧弱化所引起的燃料抛散的非对称性特征进行了研究。计算结果表明:中心装药的不耦合系数并非越大越好,在本研究中,De=2时最佳;中心装药负偏移2 mm时,燃料在正方向抛散速度增大6 m·s-1,在负方向的抛散速度减小13 m·s-1,负偏移量增大,负方向抛散速度减小和正方向抛散速度增大的趋势更加明显,说明中心装药的偏移对FAE燃料的抛散有同向抑制,反向促进作用;FAE装置壳体出现单侧弱化时,装置两侧燃料的抛散速度都降低,同等条件下,采用聚氯乙烯壳体的FAE装置两侧燃料抛散速度减小程度小于采用钢制壳体的FAE装置,这说明速度的减小在使用弱约束时表现轻微,使用强约束时表现显著。

Non-ideal Characteristics of Fuel Dispersal Driven by Explosive

The influence of decouple coefficient(De), the center charge offset and shell weakening in one side on non-ideal characteristics of fuel dispersal were studied by using LS-DYNA. The calculation results show that the optimum value of De is 2 in this study. When the negative offset of center charge is 2 mm, the dispersal velocity in positive direction increases 6 m·s^-1 and decreases 13 m·s^-1 in negative direction. The more the negative offset of center charge increases, the more obvious the velocity increases in positive direction and decreases in negative direction, which indicates that the offset of center charge has inhibition effect at the same direction and promotion effect at the inverse direction on fuel dispersal. And when unilateral weakening occurs, the dispersal velocity of fuel in both sides decrease and the decrease of dispersal velocity in both sides of the Fuel-Air-Explosive (FAE) device using PVC shell is less than that of steel shell, which suggests the decrease of velocity is obvious when using high strength shell and slight with low strength shell.