Investigation of the tail-slapping load and trajectory stability of a trans-media vehicle during high-speed oblique water entry
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摘要: 为深入了解跨介质结构体在高速入水过程中会受到多次尾拍作用，基于VOF多相流方法开展了跨介质入水结构体及其附体带攻角倾斜入水工况下自空泡产生、发展至溃灭全过程的载荷研究，分析了入水结构体主体及附体结构入水全过程的载荷特性，揭示了入水倾角对尾拍、空泡溃灭载荷及入水稳定性的影响规律。结果表明：空泡溃灭阶段为结构体入水过程中的最危险工况，随入水倾角增大，空泡溃灭阶段结构体轴、法向受力增大，法向过载系数趋近于常数；当入水倾角由60°增至90°后，结构体的俯仰力矩系数增大了47.1%；大倾角入水能够增益空泡溃灭阶段水平尾舵的轴、法向载荷环境，改善结构体入水稳定性，但同时会恶化垂直尾舵的轴向载荷环境；空泡溃灭阶段尾空泡击打结构体尾部瞬间，结构体三向转动被抑制，处于短暂静止状态。Abstract: To understand the multiple tail-slapping the trans-media vehicle going through during the high-speed water entry, which may cause damage to the main structure and its accessories. The study was conducted to investigate the load characteristics of the main body of the trans-media vehicle and its accessories in the stages of the generation, development, and collapse of cavities under the condition of inclined water-entering with an attack angle, based on the VOF multiphase flow method. The influence of the water entry inclination angle on the tail-slapping load, cavity collapse load and the trajectory stability are revealed. The results show that the cavity collapse stage is the most dangerous working condition during the water entry process. As the water entry inclination angle increases, the axial and normal forces on the structure increase in the cavitation collapse stage, while the normal overload coefficient approaches a constant. When the inclination Angle into the water increased from 60° to 90°, the pitch moment coefficient of the structure increased by 47.1%. A larger inclination angle can reduce the axial and normal loads of the horizontal rudders during the cavity collapse stage, and also improve the trajectory stability of the vehicle. However, it will increase the axial loads of the vertical rudders at the same time. When the cavity wall impacts the tail of the trans-media vehicle during the cavity collapse stage, the three-directional rotation of the body is suppressed, causing it to be in a brief state of rest.
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Key words:
- High-speed water entry /
- tail-slapping /
- tail rudder /
- the cavity collapse /
- the trajectory stability
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图 2 中等尺寸计算域网格划分及数值模型验证
Figure 2. Mid-meshing of computational field and the numerical model validation
图 6 入水结构体三向受力系数曲线图
Figure 6. The three-directional force coefficient curves of the water entry object
图 7 空泡溃灭阶段三向阻力系数峰值（绝对值）
Figure 7. The peak three-directional resistance coefficient (absolute value) during the cavity collapse stage
图 8 入水结构体轴、法向过载力系数曲线图
Figure 8. The axial and normal overload force coefficients of the water entry vehicle
图 9 入水结构体三向力矩系数时历曲线
Figure 9. The time-history curves of the three-directional moment coefficients of the water entry vehicle
图 10 空泡溃灭阶段三向力矩系数峰值（绝对值）
Figure 10. Peak three-directional moment coefficient (absolute value) during the cavity collapse stage
图 11 入水结构体尾舵布局及舵自由度示意图
Figure 11. Schematic diagram of layout and degrees of freedom of the tail rudders
图 12 尾舵轴向力系数时程曲线
Figure 12. Time-history curves of axial force coefficient of the rudders
图 13 尾舵法向力系数时程曲线
Figure 13. Time-history curves of normal force coefficient of the rudders
图 14 空泡溃灭阶段$ \left| {C}_{x}\right| $峰值
Figure 14. Peak value of $ \left| {C}_{x}\right| $ at the cavity collapse stage
图 15 空泡溃灭阶段$ \left| {C}_{\varphi }\right| $峰值
Figure 15. Peak value of $ \left| {C}_{\varphi }\right| $ at the cavity collapse stage
图 17 空泡溃灭阶段$ |{C}_{\mathrm{m}r}| $峰值
Figure 17. Peak value of $ |{C}_{\mathrm{m}r}| $ at the cavity collapse stage
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