电爆驱动高速飞片冲击下 HNS 小尺寸装药的起爆与爆轰特性

Exploding foil initiators (EFIs) represents a promising initiation technology for meeting the high requirements of miniaturized and integrated weapon systems for initiation capability. To conduct an in-depth research on the initiation and detonation output characteristics of small-sized charges in the exploding foil initiator system,a synchronous test system for observing the electrical explosion-driven flyer characteristics of metal bridge foils and a particle velocity measurement system for measuring the velocity of particle at the explosive-window interface for flyer-impact-initiated small-sized explosive detonation are built. The velocity and morphological characteristics of flyers and the initiation and detonation reaction behaviors of small-sized Ultrafine Hexanitrostilbene (HNS-IV) explosive under flyer impact were investigated. The results show that the flyer velocity is positively correlated with the initiation voltage. When the initiation voltage ranges from 900 V to 1 500 V, the flyer velocity exiting the accelerator chamber is measured at 2 000 m / s to 4 200 m / s. HNS-IV-based explosives demonstrates a short growth distance of detonation under high-intensity impact. For instance,a stable detonation is achieved within just 2. 14 mm under the action of a 3 455 m / s flyer. The further analysis of detonation wave structure indicates that HNS-IV has a fast detonation reaction rate,with a reaction time of less than 27 ns and a reaction zone width of only 0. 13 mm. Under the condition of a 3 mm-diameter charge,the main detonation reaction of HNS-IV explosives remaines largely unaffected, but the energy decays rapidly in the late stage of reaction. The detonation reaction rate model is first calibrated with the experimental results,and then the effect of charge size on the energy output is studied through simulation. The results show that the increase in charge thickness is more effective in enhancing the energy output at the end of charge than the increase in charge diameter.