Air blast fireball of the composite explosive is an important way to destroy the target and effectively determines the damage effect. Herein, based on the effect of aluminum powder content on the explosion reaction kinetics of HMX-based aluminized explosives, the cylindrical charges with positive gradient structure (PGS) and negative gradient structure (NGS) were designed and prepared to control the structure and size of air blast fireball. The PGS cylinders exhibited lateral shuttle-shaped flame/fireball and the width of the fireball was 3.901 m, which was increased by about 14% compared with homogeneous cylinders. The NGS cylinders led to the vertical shuttle-shaped flame/fireball that the height of the air blast fireball reached 4.049 m, and had longer durations of the fireball. The numerical fitting results show that the lateral shuttle-shaped flame/fireball and vertical shuttle-shaped flame/fireball gradually changed into spherical-like flame/fireball with an increase from 0 to 30 wt% of outer and inner layer HMX content, respectively. The vertical shuttle flame/fireball gradually changed into a spherical-like flame/fireball with the increase of HMX content. This is a feasible way to regulate the shape and size of the air blast fireball through gradient adjusting the distribution of HMX and Al, which could provide an effective strategy to improve the damage effect.

中文翻译：

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具有定制梯度结构的 HMX/Al 可变鼓风火球


复合炸药空爆火球是摧毁目标的重要方式，有效决定毁伤效果。本文根据铝粉含量对HMX基含铝炸药爆炸反应动力学的影响，设计制备了正梯度结构（PGS）和负梯度结构（NGS）的圆柱形装药，以控制炸药的结构和尺寸。空气爆炸火球。 PGS圆柱体呈现横向梭形火焰/火球，火球宽度为3.901 m，与均质圆柱体相比增加了约14%。 NGS气缸产生垂直梭形火焰/火球，空气喷射火球高度达到4.049 m，并且火球持续时间更长。数值拟合结果表明，随着外层和内层HMX含量分别从0wt%增加到30wt%，横向梭形火焰/火球和垂直梭形火焰/火球逐渐转变为球形火焰/火球。随着HMX含量的增加，垂直梭形火焰/火球逐渐转变为球形火焰/火球。这是通过梯度调节HMX和Al的分布来调节空气爆炸火球形状和尺寸的可行方法，为提高毁伤效果提供了有效策略。