Experiment research of low-speed oblique water-entry of truncated cone-shaped projectile
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摘要: 为研究截锥体头型弹丸在低速斜入水条件下，头部直径大小对入水空泡及弹道特性的影响，基于高速摄像方法，开展不同截锥体头型弹丸低速倾斜入水对比实验，得到了截锥体头弹丸头部直径大小对入水空泡、运动速度、俯仰角的影响规律。实验结果表明：截锥体头弹丸头部直径越大，尾部越早与空泡下壁面发生碰撞；头部直径大小对空泡深闭合时间几乎没有影响；弹丸空泡随头部直径增大而增大；头部直径过大或者过小均不利于入水稳定性；弹丸速度低于临界值时呈上升趋势，高于临界值时将呈现下降趋势。Abstract: In this work we conducted comparative experiments of different truncated cone-nosed projectiles entering water at low-speed and oblique inclination to investigate the influence of the size of the head diameter on water-entry cavity and ballistic characteristics using high-speed photography. We observed and recorded the effects of the size of the head diameter on the cavitational evolution, velocity and pitch angle of the truncated cone-nosed projectiles. The following results were achieved: the larger the truncated cone head projectile diameter, the earlier the tail collides with the low surface cavity; the size of the head diameter has little effect on the cavity deep closure moment; the cavity of projectile increases with the increase of the head diameter; an excessively large or small head diameter is not conducive to the stability of water entry; when the water entry velocity of the projectile is below the critical velocity, the velocity shows an upward trend, while when it is above the critical velocity, it will show a downward trend.
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Key words:
- truncated cone /
- cavity /
- ballistic characteristics /
- water entry stability
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图 3 工况1条件下，弹丸斜入水航行姿态与空泡演变图
Figure 3. Navigation attitude and bubble evolution diagram of projectile obliquely entering water under condition 1
图 4 工况2条件下，弹丸斜入水航行姿态与空泡演变图
Figure 4. Navigation attitude and bubble evolution diagram of projectile obliquely entering water under condition 2
图 5 工况1入水空泡深闭合时刻
Figure 5. Deep closure moment of water entry cavity under condition 1
图 6 工况2入水空泡深闭合时刻
Figure 6. Deep closure moment of water entry cavity under condition 2
图 7 工况1入水过程俯仰角变化曲线
Figure 7. Variation of elevation angle in water entry process under condition 1
图 8 工况2入水过程俯仰角变化曲线
Figure 8. Variation of elevation angle in water entry process under condition 2
表 1 弹丸模型的头部特征
Table 1. Head characteristics of projectile model
弹丸模型 头部直径/mm 侧面面积/mm2 前端面面积/mm2 模型 A 2 70.65 3.14 模型 B 3 62.80 7.07 模型 C 4 51.81 12.56 
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