Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles

HUANG Zhengui; FAN Haowei; CHEN Zhihua; ZHOU Ke; LIU Xiangyan; WANG Hao

doi:10.11883/bzycj-2023-0156

Volume 44 Issue 1

Jan. 2024

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HUANG Zhengui, FAN Haowei, CHEN Zhihua, ZHOU Ke, LIU Xiangyan, WANG Hao. Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles[J]. Explosion And Shock Waves, 2024, 44(1): 013301. doi: 10.11883/bzycj-2023-0156

Citation:

HUANG Zhengui, FAN Haowei, CHEN Zhihua, ZHOU Ke, LIU Xiangyan, WANG Hao. Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles[J]. Explosion And Shock Waves, 2024, 44(1): 013301. doi: 10.11883/bzycj-2023-0156

Citation:

HUANG Zhengui, FAN Haowei, CHEN Zhihua, ZHOU Ke, LIU Xiangyan, WANG Hao. Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles[J]. Explosion And Shock Waves, 2024, 44(1): 013301. doi: 10.11883/bzycj-2023-0156

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Numerical simulation study on the mechanism and characteristics of high-speed water entry of hollow projectiles

doi: 10.11883/bzycj-2023-0156

National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2023-04-27
Rev Recd Date: 2023-06-05

Available Online: 2023-11-02

Publish Date: 2024-01-11

Abstract

Abstract

To analyze the mechanism and characteristics of high-speed water entry of hollow projectiles, a numerical simulation study of the high-speed water entry of the hollow projectiles was carried out based on the Reynolds average Navier-Stokes equation (RANS), the volume of fluid (VOF) multi-phase flow model, the realizable k-ε flux model, the Schnerr and Sauer aeration model, the six-degrees-freedom (6-DOF) motion simulation method, and the overlapping grid technology. The effects of through-hole aperture and head shape on the cavitation characteristics, cavity morphology, and water entry kinematic properties of the hollow projectile were obtained. The effectiveness of the calculation method was verified by comparing it with the water entry experiment. The results show that the numerically calculated cavity morphology and water entry velocity and displacement curves are in good agreement with the experimental results, which verify the effectiveness of the numerical simulation method. When the through-hole aperture is different, the larger the through-hole aperture, the more pronounced the cavitation phenomenon and the longer the through-hole jet, but the effect on the radius of the cavity is not significant. The smaller the through-hole aperture, the earlier the closure time, the higher the peak drag coefficient resulting from impact with the water surface, and the greater the drag coefficient after the hollow projectile has stabilized in the water. The movement of the hollow projectile is most stable when the dimensionless diameter is between 0.575 and 0.600. When the head cone angle is varied, the larger the head cone angle, the larger the diameter of the cavity, and the later the cavitation phenomenon begins, but the faster the cavitation is generated. As the head cone angle increases, the drag coefficient becomes larger and the velocity of the hollow projectile decays faster, moving a shorter distance at the same time. However, the larger the head cone angle, the smaller the change in pitch angle and the more stable the motion of the hollow projectile.
- hollow projectile,
- cavity evolution,
- high-speed water entry,
- motion characteristics

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References(24)

References

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