头型对射弹高速入水稳定性的影响

doi:10.7527/S1000-6893.2023.28437

Abstract

Abstract:

Cavitation evolution characteristics and water entry stability of projectiles with different nose shapes during high-speed oblique water entry impact and underwater navigation phases with cavitation are studied to provide a theoretical basis for high-speed projectiles， air-dropped torpedoes and other trans-medium weapons to attack targets with high accuracy. Combined with high-speed full flow field visualization experiments technology and numerical simulation analysis， influence of projectile nose shapes on water entry cavitation shapes， cavitation size， movement speed， pitch angle and water entry stability is emphatically discussed by comparing the high-speed oblique water entry process of projectiles with three different nose shapes. Comparison involves cylindrical flat nose， hemispherical nose and 90° cone nose.Results show that although the process of water entry and underwater navigation with cavitation of the three projectiles are the same， the nose shape has a significant influence on water entry cavitation characteristics and water entry stability of projectiles during high-speed oblique water entry. In the water entry phase， the water entry cavitation diameter of the cylinder flat nosed projectile is the largest， followed by the 90° cone nosed projectile， and the smallest being the hemispherical nosed projectile. The water entry impact load decreases in the order of cylindrical flat nosed projectile， hemispherical nosed projectile and 90° cone nosed projectile. During the underwater navigation phase with cavitation， the maximum length-to-diameter ratio of the water entry cavitation of the cylindrical flat nosed projectile reaches 7.187， which is large in diameter and short in length； on the contrary， the maximum length-to-diameter ratio of the water entry cavitation of the hemispherical nosed projectile is as high as 10.864， and the cavitation shows a slender shape. However， the cavitation shape of the 90° cone nosed projectile is extremely unstable due to the destruction of the cavitation wall. In the whole water entry process， the hemispherical nosed projectile has the best water entry stability， followed by the cylindrical flat nosed projectile， and the 90° cone nosed projectile has the worst water entry stability.

Key words: water entry stability, projectile nose shape, water entry impact, water entry cavitation, high-speed water entry, computational fluid dynamics

CLC Number:

V211.1⁺7

Sihua LIU, Zhanying WANG, Lijian LI, Mindi ZHANG. Influence of nose shapes on high-speed water entry stability of projectile[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(21): 528437-528437.

Figures/Tables 22

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参数	圆柱平头射弹	半球头射弹	90°锥头射弹
直径D₀/mm	9	9	9
长度L₀/mm	36	36	36
质量m/g	10.684	9.940	9.196
质心位置（距弹头距离）L₁/mm	13.664	14.603	15.603

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Influence of nose shapes on high-speed water entry stability of projectile

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