Study on load reduction characteristics of porous foam buffer for high speed water entry vehicle
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摘要: 针对航行体高速入水时的缓冲降载问题,设计了适用的缓冲头罩及多种开孔形式的缓冲泡沫构型,基于任意拉格朗日-欧拉方法,建立了航行体高速入水缓冲降载数值计算模型。并通过数值仿真对不同开孔形式的缓冲泡沫降载性能进行了深入研究。结果表明,多孔缓冲泡沫在分散航行体入水冲击力及吸收冲击能量方面表现出显著优势,具有更好的缓冲效果。同时,缓冲头罩在入水时会发生局部渐进破碎,缓冲罩壳与航行体之间的连接器处的缓冲头罩外壁面的变形和破裂是由于撞水时产生的应力集中分布引起的。多孔泡沫接触水面时,前端部分会进入坍塌阶段,吸收大量能量并产生塑性变形,孔隙减少,此阶段为缓冲泡沫的主要能量吸收阶段。相比之下,不开孔泡沫的降载性能较差。因此,采用多孔泡沫是一种更优的航行体高速入水缓冲降载方案。
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关键词:
Abstract: Addressing the buffering and load reduction challenges during high-speed water entry vehicle, applicable buffer head covers and various open-cell buffer foam configurations were designed. In the Arbitrary Lagrangian-Euler method, as the material flows within the spatial grid, the grid itself is able to move. This unique feature allows the Arbitrary Lagrangian-Euler method to harness the advantages of both the Lagrangian and Euler methods. It not only overcomes numerical calculation challenges stemming from element distortion but also facilitates accurate computation of large deformations and displacements in solids and fluids. This makes it particularly well-suited for addressing high-speed water buffer load reduction problems. Based on the Arbitrary Lagrangian-Eulerian method and considering the large deformation of the buffer foam and the hood, a numerical calculation model for buffering and load reduction during high-speed water entry of navigational bodies was established. Through numerical simulations, an in-depth study was conducted on the load reduction performance of buffer foams with different open-cell patterns. The results indicate that open-cell buffer foam exhibits significant advantages in dispersing the impact force and absorbing impact energy during water entry of navigational bodies, offering better buffering effects. Simultaneously, the buffer head cover experiences local progressive fragmentation upon water entry. The deformation and rupture of the outer wall surface of the buffer head cover at the connector between the buffer shell and the navigational body are caused by the stress concentration distribution generated during water impact. When the open-cell foam contacts the water surface, the front part enters the collapse stage, absorbing a large amount of energy and undergoing plastic deformation, resulting in a reduction of pores. This stage is the primary energy absorption phase for the buffer foam. In comparison, closed-cell foam exhibits poorer load reduction performance. Therefore, the adoption of open-cell foam represents a superior solution for buffering and load reduction during high-speed water entry of navigational bodies.-
Key words:
- high-speed water entry /
- buffer load reduction /
- energy absorption /
- porous foam
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