Numerical Research on Evolution of Vertical Water-Exit Cavity of Vehicle under Ice Hole Constraint
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摘要: 高纬度地区在冬季不可避免地出现结冰期, 考虑到低温冰区水下发射过程中面临冰层裂隙的特殊力学环境, 扩展低温冰区中的潜射海洋装备具有重要的工程价值。浮冰的存在必然增强潜射航行体高速出水过程中的非线性。文中采用动态流体相互作用模块对航行体建立6自由度运动模型, 通过对不同冰孔尺寸、冰孔形状约束条件下潜射航行体的水下运动及穿越水面阶段对比分析, 探究冰孔对出水空泡演变的影响。研究发现: 在冰孔约束出水过程中, 冰孔对空泡具有明显的束缚作用, 且束缚作用随着冰孔尺寸的减小而增强; 相同冰孔形状下, 冰孔尺寸越小, 其对航行体俯仰运动特性影响越大; 相同冰孔尺寸下, 圆形冰孔对航行体俯仰运动特性影响大于正方形和三角形冰孔。Abstract: In high-latitude areas, the icing period is inevitable during winter. In view of the special mechanical environment of ice cracks faced during underwater launching in low-temperature ice zones, it is of great engineering value to expand the application of submarine-launched marine equipment in a low-temperature ice zone. The presence of floating ice inevitably enhances the nonlinearity of submarine-launched vehicles during high-speed water exit. A 6-degree-of-freedom(DOF) motion model of the vehicle was built by using the dynamic fluid interaction module(DFBI). Through comparative analysis of the underwater and cross-water motion stages of the submarine-launched vehicle under different ice hole sizes and shapes, the influence of ice holes on the evolution of the water-exit cavity was explored. The findings indicate that the ice hole has an obvious binding effect on the cavity during the process of water exit, and the binding effect increases with the decrease in ice hole size. For the same shape of the ice hole, a smaller ice hole size is accompanied by a greater impact on the pitching motion characteristics of the vehicle. For the same ice hole size, the circular ice hole has a greater impact on the pitching motion characteristics of the vehicle than square and triangular ice holes.
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Key words:
- ice hole constraint /
- submarine launched /
- vehicle /
- water-exit cavity
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图 1 航行体与不同尺寸的冰孔示意图(俯视图)
Figure 1. Schematic diagram of the vehicle and different sizes of ice holes (top view)
图 5 不同网格数量下航行体竖直方向位移
Figure 5. The vertical displacement of the vehicle with different grid numbers
图 7 不同冰孔尺寸下出水空泡形态演变
Figure 7. The water-exit cavity evolution with different ice hole sizes
图 8 航行体在不同冰孔尺寸中的沾湿程度
Figure 8. The wetting degree of the vehicle with different ice hole sizes
图 9 不同冰孔尺寸下空泡体积变化
Figure 9. The volume change of the cavity with different ice hole sizes
图 10 不同冰孔尺寸下航行体俯仰运动特性
Figure 10. The motion chacteristics of the vehicle with different ice hole sizes
图 11 航行体与不同形状的冰孔示意图(俯视图)
Figure 11. Schematic diagram of the vehicle and different shapes of ice holes (top view)
图 12 不同冰孔形状下出水空泡形态演变
Figure 12. The water-exit cavity evolution with different ice hole shapes
图 13 航行体在不同冰孔形状中的沾湿程度
Figure 13. The wetting degree of the vehicle with different ice hole shapes
图 14 不同冰孔形状下空泡体积变化
Figure 14. The volume change of cavity with different ice hole shapes
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