Abstract In this paper, high-speed impacting different size water-filled containers by projectiles have been performed experimentally, particular attention is given to characterizing the container confinement effects on the cavity characteristics induced by regular projectiles impacting into the confined containers. Experimental results indicate that the confinement effect on the cavity evolution is mainly reflected in the influences on the maximum cavity radius and the average cavity wall velocity. An analytical cavity model based on the principle of energy conservation was developed to describe the cavity dynamics in high-speed impacting these “non-infinite” containers. Furthermore, the hydrodynamic pressure acting on the container wall induced by cavity expansion and the critical size of the container in presence of constraint effects were theoretically analyzed. The objective of presented work is to reveal the problem of hydrodynamic pressures acting on the container wall caused by cavity expansion in a Hydrodynamic ram event, and to provide the theoretical basis for studying the nature of Hydrodynamic ram caused by cavity expansion along the trajectory. Good agreements were observed between analytical results and experimental observations.

中文翻译：

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弹道冲击下密闭容器流体动力柱塞分析中的空腔动力学

摘要 本文对弹丸高速冲击不同尺寸的充水容器进行了实验，重点研究了常规弹丸撞击密闭容器引起的容器密闭效应对空腔特性的影响。实验结果表明，对空腔演化的约束效应主要体现在对最大空腔半径和平均空腔壁速度的影响上。开发了一种基于能量守恒原理的分析空腔模型来描述高速撞击这些“非无限”容器时的空腔动力学。此外，从理论上分析了空腔膨胀引起的作用在容器壁上的动水压力和存在约束效应时容器的临界尺寸。本工作的目的是揭示在流体动力柱塞事件中由腔体膨胀引起的作用在容器壁上的流体动压力问题，并为研究腔体沿轨迹膨胀引起的流体动力柱塞的性质提供理论基础。在分析结果和实验观察之间观察到良好的一致性。并为研究空腔沿轨迹膨胀引起的流体动力柱塞的性质提供理论依据。在分析结果和实验观察之间观察到良好的一致性。并为研究空腔沿轨迹膨胀引起的流体动力柱塞的性质提供理论依据。在分析结果和实验观察之间观察到良好的一致性。