药型罩参数对聚能射流水下运动的影响

目的研究药型罩结构参数对所形成的聚能射流在水中运动的影响,改进水中聚能射流的运动特性。方法采用多物质单元ALE法就锥形罩射流对水介质的侵彻进行数值模拟,分析锥形装药结构中药型罩锥角和厚度对所形成的聚能射流侵彻水时运动参数的影响。结果锥形罩锥角大小及药型罩厚度对聚能射流在水中的形状、射流速度、加速度等有着明显的影响。侵彻体进入水中10 cm后,药型罩的锥角从30°增加到150°的过程中,剩余速度先增大、后减小,在90°时达到最高。药型罩厚度为1.5~4mm时,剩余速度变化起伏小;厚度为4~6 mm时,剩余速度开始大幅下降。结论当锥角为90°时,罩厚为4 mm的药型罩所形成的射流在水中表现最好,形成的射流侵彻深度最长,侵彻水介质10 cm后的剩余速度最大,存速能力最强。

Effects of Parameters of Charge Cover on Underwater Movement of Shaped Charge Jet

The work aims to study the effects of the structural parameters of the charge cover on the movement of shaped charge jet in water and improve the movement characteristics of shaped charge jet in water. Numerical simulation of water penetration by conical casing jet was carried out with the multi-material element ALE method, and the effects of cone angle and thickness on the movement parameters of shaped charge jet were analyzed. The results showed that the cone angle of conical cover and the thickness of charge cover had obvious effects on the shape, velocity and acceleration of shaped charge jet in water. The remaining velocity of the invading body after entering the water of 10 cm was analyzed, and it was found that in the process of increasing the cone angle of the charge cover from 30° to 150°, the remaining speed increased first and then decreased, and reached the fastest at 90°; when the thickness of the charge cover was between 1.5 mm and 4 mm, the remaining speed changed little, and when the thickness was between 4 mm and 6 mm, the remaining speed began to decrease significantly. According to the results of the numerical simulation in this work, when the cone angle is 90°, the jet formed by the charge cover with a thickness of 4 mm performs better in the water, the jet formed has the longest penetration depth, and the remaining speed after invading the aqueous medium of 10 cm is the largest, and the storage capacity is the strongest.