平顶药型罩聚能射流形成过程研究

Study of shaped charge jet formation process with flat-top liner

ANSYS/LS-DYNA对平顶药型罩的射流形成过程进行数值模拟,结果表明,在顶点起爆条件下,平顶药型罩的平顶中心首先下凹并拉动药型罩边壁向内汇聚,使得存在夹角的平顶与边壁整体构成环形线性聚能罩,此聚能罩在炸药爆轰作用下产生一级射流,一级射流彼此作用继而产生更高速度的二级射流。分析认为其机理是二级药型罩成型假说,尝试探索研究多级射流领域,并为提高射流速度提供一种新思路。

Jet formation of flat-top liner was numerically simulated by the software ANSYS/LS-DYNA.The results showed that the ceiling of flat-top liner was concaved by explosive effect,then the whole liner wall was pushed inside to form an annulus linear shaped charge cover because of the angle between liner ceiling and liner wall.The primary jet was produced by the annulus liner under the action of explosive detonation.Primary jet collided with each other in the central axis to form the second level jet with higher velocity.The formation process of second-level jet could be explained by the second level liner hypothesis.The new idea about how to improve the jet velocity was given to try to explore the multi-level jet field.