【摘要】 为研究扇形结构燃料抛撒特性,利用LS-DYNA程序,对中心抛撒药驱动燃料抛撒和壳体破坏过程进行了数值模拟,并与试验结果进行了对比。得到了燃料抛撒速率随时间变化的规律,以及抛撒药类型及其位置、刻槽间距与深度对燃料最大速率和结构响应的影响。结果表明:燃料最大速率值出现在180°方向;而0°方向最早出现最大速率。与RDX相比,高爆速、高爆压的中心抛撒药HMX导致壳体破坏程度的加剧和燃料的最大抛撒速率平均下降18%。对于抛撒药的中心位置,过于偏离横截面形心的设置方式将引起燃料抛撒速率的降低和壳体的横向断裂。当刻槽间距为40 mm、刻槽深度为2 mm时,模拟结果显示壳体应力集中现象较少,且燃料在180°方向的最大抛撒速率为283 m·s-1。更多还原

【Abstract】 In order to study dispersal characteristics for sector cross-section structure,the processes of fuel dispersion and shell breakage driven by central explosive were simulated by LS-DYNA code,and the simulated and experimental results were compared. The variation of fuel velocity with time was obtained. The effects of explosive types,groove spacing and groove depth on dispersion were analyzed. Results showthat the maximumdispersal velocity of fuel shows up at 180° direction,while the earliest time for the maximumdispersal velocity is at 0° direction. C ompared with RDX,HMX exacerbates the extension of shell breakage due to higher explosion pressure and velocity. Thus,dispersal velocity of fuel reduces by 18% averagely. As for location of central explosive,lower dispersal velocity of fuel and radical breakage of shell would occur when central explosive deviates overly fromthe center of shell cross-section. With40 mmgroove spacing and 2 mmgroove depth,simulation reveals fewer shell stress concentration and higher dispersal velocity(283 m·s-1) at 180° direction.更多还原