大孔径双向聚能射孔弹的研究

 设计了一种双锥药型罩与双向装药结构相结合的聚能射孔弹模型，通过数值模拟方法研究其射流成型机理，并计算其射流参数。结果显示：双锥药型罩的小锥角部分形成聚能射流，大锥角部分形成翻转弹丸，射流头部和弹丸的速度分别为6 250 m/s和1 620.9 m/s，弹丸长度和平均直径分别为26.1 mm和8.6 mm。结合数值模拟结果，对射流侵彻公式进行了修正，并利用修正公式预测该射孔弹侵彻钢靶的深度，计算结果为69.6 mm。最后，按照该模型进行侵彻实验，实验回收弹丸的长度和平均直径分别为28.1 mm和8.8 mm，侵彻钢靶的深度和孔径分别为70 mm和17 mm。实验表明：数值模拟与理论计算方法相结合是可行的，能够有效地计算射孔弹的射流参数并预测其侵彻深度；该射孔弹侵彻性能优越。

Study on Big Entry Hole Bidirectional Shaped Charge

A shaped charge model, in which  the biconical liner with the two-way charging structure was combined, was designed. Its jet formation mechanism was studied by means of numerical simulations, and the jet parameters were calculated. The obtained results were shown as follows: First, the small cone angle of the liner formed shaped charge jet, and the large cone angle formed explosively over-turned projectile. Second, the velocity of the jet tip and the projectile were respectively 6 250 m/s and 1 620.9 m/s. Third, the length and average diameter of the projectile were 26.1 mm and 8.6 mm. Based on the numerical results the jet penetrate formula was amended and then used to calculate the penetration depth of the shaped charge, and the calculated value was 69.6 mm. Finally, an experiment was carried out according to the model, the length and average diameter of the projectile were 28.1 mm and 8.8 mm. Furthermore, the penetration depth and hole size were 70 mm and 17 mm. Good agreement is among the numerical, theoretical calculation and the experimental results. In addition, the superior penetration performance is proved by the experimental results.