超聚能射流成型特性数值模拟研究

Numerical simulation study on the characteristics of supercharged jet forming

为研究超聚能射流成型规律,利用LS-DYNA软件对不同药型罩结构下射流成型过程进行了数值模拟,对比分析了超聚能射流与聚能射流成型速度、延展性能以及药型罩微元动能分布规律。结果表明,聚能射流和超聚能射流均是由药型罩内表面不断向中间挤压形成,超聚能药型罩形成的射流具有更好的延伸性和射流头部速度,但是超聚能射流初步成型后射流头部速度明显降低约5.8%;相比于锥形聚能药型罩,改进后的超聚能药型罩射流成型后延伸性能提高约60.6%,射流头部速度提高约29.2%;超聚能药型罩射流成型过程中,辅助药型罩动能最小,主药型罩内表面中下部分形成的射流动能最大。

In order to study the forming law of ultra high energy jet,numerical simulations were conducted using LS-DYNA software on the jet forming process under different types of propellant cover structures.The forming speed,Elongation performance,and distribution law of micro element kinetic energy of propellant cover were compared and analyzed between ultra high energy jet and concentrated energy jet.The results showed that both the shaped charge cover and the super shaped charge cover were formed by continuously squeezing the inner surface of the charge cover towards the middle.The jet formed by the super shaped charge cover had better extensibility and jet head velocity,but the jet head velocity significantly decreased by about 5.8%after the initial formation of the super shaped charge cover.Compared to the conical shaped charge cover,the improved ultra shaped charge cover has an improved extension performance of about 60.6%and an increased jet head velocity of about 29.2%.During the jet forming process of the super concentrated energy propellant cover,the kinetic energy of the auxiliary propellant cover is the smallest,while the kinetic energy of the jet formed in the middle and lower parts of the inner surface of the main propellant cover is the largest.