摘要
对励磁线圈内部磁场进行了理论分析,建立了线圈与金属射流作用的有限元模型,得出了励磁线圈结构参数变化对金属射流箍缩特性的影响规律。结果表明,随着励磁线圈长度增大,金属射流中的感应电流密度、磁感应强度及电磁力随之增大,励磁线圈长度要大于金属射流劲缩部位长度,才能保证金属射流有效变形;随着励磁线圈内径增大,金属射流中的感应电流密度、磁感应强度及电磁力随之减小,励磁线圈内径尺寸要尽量接近金属射流直径最大尺寸,二者直径差尽量控制在3~5 mm范围内,以形成较大磁压力差,减小由于金属射流轴向速度梯度引起的表面扰动,进而延缓金属射流箍缩直至断裂的过程,增强其对装甲等军事目标的侵彻穿深能力。研究成果将为破甲弹威力电磁增强技术可行性论证、原理试验及相关结构设计提供重要的理论和技术支撑。
In order to analyze the pinch effect of magnet exciting coil structural parameters on shaped charge jet of High-Explosive Anti-Tank( HEAT),theoretical analysis of internal magnetic field was done with finite model of coil and shaped charge jet established and pinch effect law of magnet exciting coil structural parameters on shaped charge jet obtained. The results show that,with length increase of magnet exciting coil,induced current density,magnetic flux density and electromagnetic force of shaped charge jet increase,with the length of magnet exciting coil being bigger than that of shaped charge jet pinch part,so that it can ensure effective deformation of shaped charge jet. With diametrical increase of magnet exciting coil,induced current density,magnetic flux density and electromagnetic force of shaped charge jet decrease,the diametrical size of magnet exciting coil gets as close to maximum diameter of shaped charge jet,and diametrical difference between them is controlled between 3 ~5 mm,so that it can result in a big magnetic pressure difference,decrease surface fluctuation of shaped charge jet caused by axial velocity gradient,with breakage process of shaped charge jet delayed,integrality and continuity maintained and the penetration ability of shaped charge jet enhanced in the end. The results can provide theoretical and technical support for feasibility demonstration,principle test and related physical design of the enhanced HEAT technology with the electromagnetic method.
引文
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