Confined Rayleigh–Plesset equation for Hydrodynamic Ram analysis in thin-walled containers under ballistic impacts
Confined Rayleigh–Plesset equation for Hydrodynamic Ram analysis in thin-walled containers under ballistic impacts
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DOI：
10.1016/j.tws.2014.10.003
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发表时间：
2015
影响因子：
6.4
通讯作者：
T. Fourest;J. Laurens;E. Deletombe;J. Dupas;M. Arrigoni
中科院分区：
文献类型：
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作者：
T. Fourest;J. Laurens;E. Deletombe;J. Dupas;M. Arrigoni
为了降低民用和军用飞机的易损性，在设计其油箱时必须考虑流体动力冲压（HRAM）压力。特别地，HRAM对于由于重量惩罚原因而不能被装甲化的薄壁轻质结构是特别危险的。在最近的高速坦克穿透/入水实验中观察到HRAM和水下爆炸情况之间的气泡行为的相似性。目前的工作涉及的应用程序的限制版本的瑞利-Plesset方程-这是经典的气泡动力学分析（包括水下爆炸）-模拟由HRAM事件引起的弹丸在弹道速度在一个封闭的几何形状充满了液体的穿透所产生的气泡。这个方程被应用到一个小的封闭容器中的碰撞情况。该模型的初始化是基于实验数据和初始能量（弹丸）的守恒原理。为了应用该方程，需要在结构上施加的压力和结构变形之间的关系。然而，它只能显式地获得球形容器。作者讨论了该方程所需的参数，并将其标定值与用解析板公式计算的理论值进行了比较。
To reduce the vulnerability of both civilian and military aircraft, it is essential to take the Hydrodynamic Ram (HRAM) pressure into account when designing their fuel tanks. In particular HRAM is especially dangerous for thin walled lightweight structures that cannot be armoured due to weight penalty reasons. Similarities in bubble behaviour between HRAM and underwater explosion situations were observed in recent high-speed tank penetration/water entry experiments. The present work concerns the application of a confined version of the Rayleigh–Plesset equation – which is classically used for bubble dynamics analysis (including underwater explosion) – to simulate a bubble created by an HRAM event induced by projectile penetration at ballistic speed in a confined geometry filled with a liquid. This equation is applied to a case of impact in a small closed tank. The initialisation of the model is based on experimental data and a conservation principle of the initial energy (of the projectile). To apply this equation, a relationship between the pressure applied on the structure and the structure deformation is needed. However it can only be obtained explicitly for spherical containers. The authors discuss the parameters needed in this equation and compare their calibrated values to theoretical ones calculated with analytical plates formulae.