On velocity attenuation of a truncated cone-shaped projectile vertically penetrating through liquid

KONG Xiangshao; SHI Gan; WANG Xuyang; ZHOU Hongchang; WU Weiguo

doi:10.11883/bzycj-2020-0075

Volume 41 Issue 1

Jan. 2021

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KONG Xiangshao, SHI Gan, WANG Xuyang, ZHOU Hongchang, WU Weiguo. On velocity attenuation of a truncated cone-shaped projectile vertically penetrating through liquid[J]. Explosion And Shock Waves, 2021, 41(1): 013301. doi: 10.11883/bzycj-2020-0075

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KONG Xiangshao, SHI Gan, WANG Xuyang, ZHOU Hongchang, WU Weiguo. On velocity attenuation of a truncated cone-shaped projectile vertically penetrating through liquid[J]. Explosion And Shock Waves, 2021, 41(1): 013301. doi: 10.11883/bzycj-2020-0075

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On velocity attenuation of a truncated cone-shaped projectile vertically penetrating through liquid

doi: 10.11883/bzycj-2020-0075

KONG Xiangshao^{1, 2
,},
SHI Gan^{1, 2},
WANG Xuyang^{1, 2, 3},
ZHOU Hongchang^{1, 2},
WU Weiguo^{1, 2}

1.
Green & Smart River-Sea-Going Ship, Cruise and Yacht Research Center, Wuhan University of Technology, Wuhan 430063, Hubei, China
2.
School of Transportation, Wuhan University of Technology, Wuhan 430063, Hubei, China
3.
Science and Technology on Liquid Rocket Engine Laboratory, Xi’an Aerospace Propulsion Institute, Xi’an 710100, Shaanxi, China

Received Date: 2020-03-20
Rev Recd Date: 2020-06-24
Publish Date: 2021-01-05

Abstract

Abstract

One of the main functions of liquid tanks in the passive protective systems of surface warships is to prevent the damage by high-velocity projectiles (explosive fragments) to important internal structures, equipments and personnels. The process of high-velocity projectile penetrating through a liquid tank involves complex energy transfer and dissipation. To explore the influences of the head shape of a projectile and its water-entry velocity on the velocity attenuation of the projectile in fluid, a series of truncated cone-shaped projectiles with different head shape factors were developed to numerically simulate the processes of the truncated cone-shaped projectiles vertically penetrating through the fluid at different initial water-entry velocities. The velocity attenuation characteristics were obtained for the projectiles vertically penetrating through the fluid. The above results display that the resistance factor of a high-velocity projectile moving in the fluid is related with the projectile shape and the ratio of the instantaneous velocity of the projectile to its initial water-entry velocity. Based on the numerical simulations and the corresponding fitting results, an empirical formula was proposed by considering the projectile head factor to predict the velocity attenuation of the truncated cone-shaped projectiles vertically penetrating through the fluid. And a series of calculation examples were carried out to verify the formula. These calculation examples show that the formula is feasible and can be used to accurately calculate the velocity attenuation of high-velocity projectiles in fluid media and it is helpful for the structural design of the protective tanks of warships.
- truncated cone-shaped projectile,
- head shape factor,
- velocity attenuation,
- protective tank

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References(14)

References

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