基于再展开法的包覆型含能药粒间静电相互作用模型与安全边界构建

The electrostatic safety boundary between coated energetic explosive particles in the production process is studied. A theoretical model of electrostatic interaction between charged coated energetic explosive particles is established by using the re-expansion method. The boundaries of charge density and electric field intensity threshold for electrostatic discharge of coated energetic explosive particle are defined based on the modified Paschen's law. The influences of key particle structure and electrical properties on electrostatic agglomeration and discharge are discussed. The results show that the polarization effect of the coated medium enhances the electric field in the gap and attractive force, resulting in a like-charge attraction phenomenon of charged particles and exacerbating the discharge risk. Under the same charge,the attractive force between the coated active metal conductor particles is much higher than that between coated single-component explosive dielectric particles. When the surface charge density of coated active metal conductor particle is ±5. 0 μC / m², the electric field exceeds the air breakdown threshold. For the coated dielectric particles,the electric field surpasses the breakdown threshold only when the surface charge density reaches ±50 μC / m². Therefore,the coated active metal conductor particles possess less electrostatic safety than that of coated single-component dielectric particles, and the greater risk of electrostatic agglomeration and electrostatic discharge.