Influence of Angle of Attack on the Hydrodynamic Characteristics of Supercavitating Projectile in Water-exit Process

被引：0

作者：

Li, He ^{[1
]}

Wang, Xu ^{[1
]}

Lü, Xujian ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing

来源：

Binggong Xuebao/Acta Armamentarii | 2025年 / 46卷 / 05期

关键词：

angle of attack; cavity evolution; hydrodynamics; supercaviting projectile; water-exit;

D O I：

10.12382/bgxb.2024.0408

中图分类号：

学科分类号：

摘要：

The water-exit process of supercaviting projectile often has an angle of attack due to launch perturbation, cross-current, wave, etc., which affects the trajectory of projectile and interferes with the successful water-exit of projectile. A numerical model for the water-exit process of supercaviting projectile with angle of attack is established based on the volume-of-fluid multiphase flow model and the moving computational domain method, and the water-exit processes of projectile at with different angles of attack and velocities are simulated. The calculated results show that a small angle of attack of the projectile has little effect on the cavity morphology in the water movement stage, and the shoulder and tail of projectile are wet with the increase in the angle of attack. A secondary cavity produced by the shoulder wetting may be rewrapped in the tail, and leads to the longer and obvious asymmetric radial distribution of cavity on the inflow side. The cavity has a tendency to expand after the projectile penetrates the water surface. The surface pressure of projectile is high at the beginning of the movement, and the high pressure region decreases rapidly as a cavity is generated, and the local high pressure occurs in the subsequent movement due to local wetting, cavity closure near the water surface, and splash collision with the water surface. The local high pressure occurs mostly on the inflow side, resulting in a higher pressure on that side than on the backflow side. The lateral forces and yaw moments appearing on the projectile cause the trajectory and attitude of the projectile to change and the angle of attack to decrease. The larger the initial angle of attack is, the more obvious its effect on the angle of attack, yaw angle change and trajectory of projectile is. When the projectile is at an angle of attack of 5° and the velocity continues to increase, the effect of velocity on the cavity morphology, the motion trajectory and yaw angle of projectile is weakened. © 2025 China Ordnance Industry Corporation. All rights reserved.

引用

共 22 条

[1]

YAO Z, WANG R, QI X B, Et al., The influence of initial disturbance on the hydrodynamic and ballistic characteristics of high-speed projectile during tail slapping, Acta Armamentarii, 41, pp. 46-53, (2020)

[2]

WANG X, QI C, LIU C, Et al., Experimental study on the cavity dynamics of a sphere entering flowing water, Physics of Fluids, 36, (2024)

[3]

ZHANG S, XU H, SUN T Z, Et al., Water-exit dynamics of a ventilated underwater vehicle in wave environments with a combination of computational fluid dynamics and machine learning, Physics of Fluids, 36, (2024)

[4]

ASHRAF I, DORBOLO S., Exit dynamics of a square cylinder, Ocean Engineering, 297, (2024)

[5]

ASHRAF I, DORBOLO S., Effect of the surface dimples on the exit dynamics of a sphere at a constant velocity, Applied Ocean Research, 147, (2024)

[6]

YUN H L, LIU Q B, ZENG Z, Et al., Experimental study on water-exit of cylinder, Ocean Engineering, 293, (2024)

[7]

ZHANG Q S, MING F R, LIU X J, Et al., Experimental investigation of the dynamic evolution of cavity during the free water-exit of a high-pressure venting vehicle [ J ], Physics of Fluids, 35, (2023)

[8]

ZHAO Q K, CHEN T, XIAO W, Et al., Research on the characteristics of cavitation flow and pressure load during vertical water exit of different head-shaped vehicles [ J ], Ocean Engineering, 265, (2022)

[9]

TAKAMURE K, UCHIYAMA T., Calculation model for water mass entrained by the water exit of a particle using two projected images captured from orthogonal directions, Ocean Engineering, 266, (2022)

[10]

NGUYEN V T, PHAN T H, DUY T N, Et al., Unsteady cavitation around submerged and water-exit projectiles under the effect of the free surface: a numerical study, Ocean Engineering, 263, (2022)

← 1 2 3 →