密闭爆发器中Al/KClO4点火器的输出性能研究

Al/KClO_4点火器的输出性能是火工分离装置总体设计的关键参数。为了更准确地描述Al/KClO_4点火器的输出性能,通过修正经典内弹道方程组假设,引入火药力修正系数,建立了改进Al/KClO_4内弹道分析模型。编写Matlab数值求解算法,计算了密闭爆发器内Al/KClO_4点火器压力峰值、压力上升时间和单位面积冲量等参数,结合实验分析了这些参数随药量和空腔容积的变化规律,计算结果与实验结果吻合较好。研究表明,Al/KClO_4点火器产生的压力峰值随药量的增加而增大,随空腔容积的增加而减小,在小容腔(5 m L)范围内,空腔容积增加1倍,压力峰值下降约40%.

Research on Output Performance of Al/KClO4 Igniter in Closed Bomb

The output performance of Al/KClO4 igniter is a key parameter for the overall design of pyrotechnically actuated separation device.In order to describe the output performance of Al/KClO4 igniter more accurately,an improved interior ballistics analysis model of Al/KClO4 is established by modifying the hypotheses of classical interior ballistics equations and introducing the correction coefficient of powder force.The Matlab numerical algorithm is written to calculate the pressure peak,pressure rise time and impulse per unit area of Al/KClO4 igniter in closed bomb.The changes of these parameters with charge mass and cavity volume are analyzed.And the calculated results are in good agreement with the experimental results.The results show that the pressure peak of Al/KClO4 igniter increases with the increase in charge mass,and decreases with the increase in cavity volume.In a small volume (＜5 mL),the cavity volume is increased by two times,and the peak pressure is decreased by about 40％.