微尺寸叠氮化铅驱动飞片重要结构参数与飞片速度和能量的关系

为获得微尺寸叠氮化铅驱动飞片的重要结构参数与飞片速度和能量的关系，进行微装药驱动飞片的仿真研究。根据叠氮化铅的爆速与密度关系，拟合出基于γ律方程的叠氮化铅Jones-Wilkins-Lee状态方程参数；利用有限元分析软件AUTODYN建立叠氮化铅驱动飞片的仿真模型，并使用光子多普勒测速系统测得飞片速度-位移关系曲线，仿真与试验曲线的一致性好。使用建立的仿真模型分析装药直径、装药高度、加速膛孔径、飞片厚度与飞片速度和能量的关系。结果表明：随着装药直径和高度的增加，飞片速度、能量增长速率减小，装药直径变化对飞片速度、能量的影响更显著；随着飞片厚度增大，飞片速度呈指数下降，飞片能量先增后减，存在着使飞片能量最大的飞片厚度；加速膛孔径小于装药直径时，飞片速度、能量略有下降；加速膛孔径大于装药直径时，飞片速度、能量急剧下降。

Relation among Important Structural Parameters,Flyer Velocity and Energy of Flyer Driven by Micro-size Lead Azide

In order to obtain the relationship among the important structural parameters and the velocity and energy of flyer driven by micro-size lead azide, the simulation study of flyer driven by micro charge was carried out. The parameters of Jones-Wilkins-Lee equation of state of lead azide based on the γ law equation are fitted from the relationship between the detonation velocity and density of lead azide. A simulation model of the flyer driven by lead azide is established by using the finite element analysis software AUTODYN, and the velocity-distance curve of the flyer is measured by using photonic Doppler velocimetry system. The simulated curve is in well consistence with the test curve. The relationship among the diameter and height of charge, the aperture of accelerating chamber, the flyer thickness and the velocity and energy of flyer is analyzed by using the established simulation model. The results show that the velocity and energy growth rates of flyer decrease with the increase in the diameter and height of charge, and the influence of charge diameter on the velocity and energy of flyer is more obvious. With the increase in the flyer thickness, the flyer velocity decreases exponentially; the flyer energy first increases and then decreases, and there is a flyer thickness that makes the flyer energy maximum. When the aperture of accelerating chamber is smaller than the charge diameter, the velocity and energy of flyer decrease slightly; when the aperture of accelerating chamber is larger than the charge diameter, the velocity and energy of flyer decrease sharply.