半椭圆形罩LSC的准三维和三维数值模拟对比

为了得到半椭圆形罩线型聚能装药(LSC)射流成型的特点和规律,利用ANSYS/LS-DYNA软件分别建立了半椭圆形罩LSC的准三维和三维数值计算模型,对射流成型过程进行了数值模拟,获得了射流成型过程的特点和典型时刻沿对称面射流速度梯度分布及射流最大速度随时间的变化关系。从横断面看,形成的射流较长且均匀,相对质量和速度均较大,速度梯度呈现明显的三段特征;杵体短而粗,相对质量和速度均较小;两种数值计算模型获得的射流最大速度出现的时刻、杵体断裂时刻和射流断裂时刻以及典型时刻沿对称面射流速度梯度分布均有所差别。结果对比分析表明,三维数值计算模型比准三维计算模型能更全面准确地模拟出射流的成型过程,获得的结果更可靠。

Comparison of quasi-three-dimensional and three-dimensional numerical simulation of LSC with half-oval cover

In order to obtain the characteristics and laws of jet forming of linear shaped charge (LSC) with half-oval cover,quasi-three-dimensional and three-dimensional numerical modeling of LSC with half-oval cover were established and numerical simulation of jet forming process were completed by ANSYS/LS-DYNA program.The characteristics of jet forming process,jet velocity gradient distribution along the symmetry plane at typical moments and the change relationship between the maximum velocity of jet and time were obtained.From the cross-section view,the jet was longer and uniform,the relative mass and velocity were larger and the velocity gradient showed three-section characteristics obviously.The pestle body was stubby and the relative mass and velocity were small.The jet maximum velocity moment,pestle body breaking moment,jet breaking moment and the jet velocity gradient distribution along the symmetrical plane at typical moments were different.The results showed that the jet forming process was more comprehensively and accurately simulated by the three-dimensional numerical calculation model in relation to the quasi-three-dimensional numerical calculation model,and the available results were more reliable.