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Hydrodynamic characteristics of the flow filed of underwater projectile passing through muzzle gas cloud in launch tube
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Xu-gang DAI1, 2, Bao-shou WANG1, Zhen-min HE1, 2, Tong-hua XU1, 2
Journal of Ship Mechanics | 2025, 29(11) : 1690 - 1698
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Journal of Ship Mechanics | 2025, 29(11): 1690-1698
• Hydrodynamics •
Hydrodynamic characteristics of the flow filed of underwater projectile passing through muzzle gas cloud in launch tube
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Xu-gang DAI1, 2, Bao-shou WANG1, Zhen-min HE1, 2, Tong-hua XU1, 2
Affiliations
  • 1.China Ship Scientific Research Center, Wuxi 214082, China
  • 2.National Key Laboratory of Science and Technology on Hydrodynamics, Wuxi 214082, China
doi: 10.3969/j.issn.1007-7294.2025.11.003
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The stored air mass (i.e. muzzle gas cloud) ahead of a projectile nose in a vertical launch tube has significant influences on the flow field and loads during underwater launching. In this paper the process was simplified to an impulsively started projectile in a stationary vertical tube, which then passied through air mass with constant velocity. The flow was investigated using numerical simulation. The primary conclusions are as follows: The air mass is compressed, pushed out, entrained, and finally forms an annular oscillating bubble, which is accompanied by intense unsteady vortex around the muzzle platform and the projectile. The oscillating pressure induced by the bubble propagates through the flow field and attenuates with time and distance. The oscillating pressure can be considered as being linearly superimposed on original flow pressure, resulting in a periodic adverse pressure gradient along the projectile surface, which affects flow separation and cavitation. The oscillating drag coefficient for different volumes of the air mass can be normalized by dimensionless time defined using the velocity and equivalent spherical diameter of the air mass.

muzzle gas cloud  /  numerical simulation  /  pressure oscillation  /  unsteady vortex motion  /  normalization
Xu-gang DAI, Bao-shou WANG, Zhen-min HE, Tong-hua XU. Hydrodynamic characteristics of the flow filed of underwater projectile passing through muzzle gas cloud in launch tube[J]. Journal of Ship Mechanics, 2025 , 29 (11) : 1690 -1698 . DOI: 10.3969/j.issn.1007-7294.2025.11.003
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Year 2025 volume 29 Issue 11
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doi: 10.3969/j.issn.1007-7294.2025.11.003
  • Receive Date：2025-05-14
  • Online Date：2026-03-18
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  • Received：2025-05-14
Affiliations
    1.China Ship Scientific Research Center, Wuxi 214082, China
    2.National Key Laboratory of Science and Technology on Hydrodynamics, Wuxi 214082, China
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表12种不同金属材料的力学参数
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Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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