基于多介质ALE方法的大型弹体入水载荷特性研究

On water-impact load of heavy projectiles base on multi-material ALE method

针对目前对大型弹体高速(200~300 m/s)入水现象研究的不足,首先建立了基于多介质任意拉格朗日-欧拉(Multi-material ALE)方法的大型弹体高速入水有限元模型,并用入水空泡轮廓经验公式对该模型的准确性进行了验证;然后,分析了头型变化对弹体总体入水载荷的影响,以及入水角变化对弹体总体入水载荷及弹道稳定性的影响。结果表明:弹体入水载荷峰值随着头部等效底升角的增大而减小,随着入水角的增大而增大;在一定范围内,入水角越大,弹道稳定性越好。

Aiming at the lack of investigation on the high-speed water-entry of heavy projectiles, and based on the multi-material ALE method, a finite element model is established to simulate the high-speed water-entry process of heavy projectiles, and the accuracy of the simulation method is verified. Then the influence of the change of the head type and water entry angle on the peak of the impact load is analyzed, together with the change of the water entry angle on the ballistic stability. The result shows that the impact load will decrease with the increasing of the bottom angle, and increase with the increasing of the water entry angle. Moreover, within a certain range, projectiles with greater entry angle have better ballistic stability.