铝药型罩环形聚能射流的数值模拟

基于一种药型罩材料为铝的环形聚能装药结构，通过Autodyn软件模拟不同起爆方式（起爆环直径D₁）和不同长径比（L/D）的装药，计算得到环形射流的成型过程和速度分布曲线.分析数值模拟结果发现:环形射流成型过程主要受长径比影响，长径比较小时射流发生内偏，长径比较大时射流发生外偏；射流轴向速度主要受长径比影响，长径比越大轴向速度越大，头部轴向速度最大相差约700 m/s；射流径向速度主要受起爆方式影响，平均径向速度最大相差为220 m/s，起爆环直径和长径比在较小或较大时，射流径向速度梯度较大；结合射流成型和速度结果，D₁=0.5D、L/D=1.0时射流综合性能较好.侵彻混凝土板试验的通孔直径为装药直径的2.6倍，数值模拟结果与试验结果误差为7.7%，验证了计算模型及算法的合理性. 

Numerical Simulation of Annular Shaped Charge with Al Liner

Based on an annular shaped charge with aluminum liner, different modes of initiation (initiation radius D₁) and length-to-diameter ratio (L/D) were simulated by Autodyn to measure the formation and jet speed of the annular jet. Numerical results showed that the formation process of the annular jet was mainly influenced by L/D, the jet tip had an inward deflection when L/D was relatively small, and an outward deflection otherwise. The axial jet speed was positively related to and also mainly influenced by L/D, and the maximum difference was about 700 m/s. The radial jet speed was mainly influenced by modes of initiation, and the maximum radial jet speed difference was about 220 m/s. The radial jet speed gradient was greater when D₁ or L/D was relatively small or big. Combined with jet formation and speed, D₁=0.5D and L/D=1.0 were preferred settings for this charge. The hole diameter of the concrete target was 2.6D₁, which is 7.7% bigger than the numerical result. The penetration experiment demonstrates that the calculation model and method are appropriate.