超空泡射弹侵彻间隔薄靶的数值模拟研究

Numerical Simulation on Penetration of Supercavitating Projectiles into Spaced Thin Targets

为分析超空泡射弹侵彻水下间隔薄板的毁伤效应,建立了固-液-气三相耦合计算模型,采用AUTODYN非线性有限元程序对侵彻过程进行计算,重点分析了空泡演化规律和入射角对弹体毁伤特性的影响。结果表明:超空泡射弹垂直侵彻间隔靶时的空泡演化规律与实验结果基本一致;弹体斜侵彻靶板时,着靶前的空泡形态不对称,且着靶角度越大,不对称性越显著;斜侵彻过程中,处于弹体与靶板夹角较小一侧的空泡膨胀受阻,而夹角较大一侧的空泡迅速膨胀;双层间隔靶的损伤为典型的塑性破孔失效,当弹体着靶角度较大时,前后靶板还伴有整体大变形;着靶角度在60°以内,弹体能够高效毁伤目标;着靶角度接近75°时,出现跳弹行为,难以造成有效毁伤。

To find out the damage effect of the supercavitating projectile penetrating into spaced thin-targets,a solid-liquid-gas three-phase coupled simulation model was established by the nonlinear finite element program,the influence of the incident angle on the cavitation evolution law and the damage characteristics of the projectiles and spaced targets were mainly analyzed based on numerical simulation results.The results show that the evolution law of cavitation for vertical penetration obtained numerically accordance well with the experimental result.For oblique penetration,the shape of the cavities in front of the target shows asymmetry,and the greater the angle of attack,the more obvious this asymmetry.During oblique penetration,the expansion of the bubble on the side with the smaller angle between the projectile and the target was blocked,while the bubble on the side with the larger angle expands rapidly.The damage of the double-layer spaced target is a typical plastic perforation failure.When the angle of attack is large enough,the two target plates are also accompanied by large overall deformation.If the angle of attack of the supercavitating projectile is less than 60°,the projectile can effectively damage the typical target.When the angle of attack is close to 75°,the supercavitating projectile will ricochet and lose its destructive power to the target.