Modeling and Simulation of Oblique Water-Entry of Disk Ogive
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摘要: 以冲击体入水动力学和入水弹道学理论为基础，针对平头尖拱体入水冲击这个复杂物理现象，引入体现液面隆起现象的沾湿因子，用等效液面代替自由水平液面，建立了斜入水高速冲击的运动学和动力学冲击模型，其中动力学模型是根据平头尖拱体沾湿面的具体几何形状而建立。然后通过时间步进技术编制斜姿态入水冲击耦合程序进行仿真计算，不仅得到斜入水冲击的最大冲击载荷，而且得到入水初始状态条件和入水冲击载荷之间的关系，以及模型中考虑液面隆起对斜入水冲击载荷计算结果的影响。最后重点分析入水过程中轴向、纵向冲击载荷和冲击转动力矩的变化规律，为忽扑、击水弹跳现象或后继的弹道提供预报。Abstract: Based on water-entry dynamic and water-entry ballistic theories, the oblique water-entry process of disk ogive is simplified and a wetted correction factor is introduced in order to accord with the true water pile phenomena, and an oblique water-entry impact model coupled with ballistic and dynamic models are established. According to the exact geometric shape of the wetted body surface, the dynamic model is established. The coupling model of the oblique water-entry impact is programmed and calculated by the time stepping codes. The greatest impact load, the initial water-entry condition and the relation between water-entry impact loads are obtained. The influence of water pile on the oblique water-entry impace load are achieved. Finally, the varying rule between axial, vertical impace load and impact moment are analyzed to predict the phenomena of whip and ricochet or succedent underwater trajectory.
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Key words:
- disk ogive /
- water pile /
- oblique water-entry /
- impact load /
- simulation
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