TY - JOUR
T1 - 旋成体射弹倾斜入水运动仿真
AU - Zhao, Xu
AU - Hu, Xinkang
AU - Yao, Kui
N1 - Publisher Copyright:
© 2023 National University of Defense Technology. All rights reserved.
PY - 2023/8
Y1 - 2023/8
N2 - In order to study the influence of motion parameters and warhead shape on the oblique entry process of a projectile into water, adopting volume of fraction of gas-liquid two-phase flow and water vapor cavitation model. The three-dimensional kinematics and dynamics of the rigid body were coupled by nested grids, and the motion process of the projectile in the stage of speed 80-100 m/s tilting into water and opening cavitation process was simulated. According to the literature experiments, the prediction errors of the velocity and displacement of the underwater projectile are 0-6% and-8% ~ 0, and the rotation angle error is-6% ~ 0. Through the simulation study of the water entry velocity and angle of entering water under multiple working conditions, it is found that with the increase of the water entry velocity, the axial impact load of the projectile increases. The maximum load is linearly related to the square of the speed, and the nonlinear attenuation rale of the velocity is large. The larger the angle of entry, the smaller the angular rate of rotation of the projectile body, the stronger the stability of movement. But the velocity decay rate is not affected by the angle of entry. The projectile body adopted a stepped head modification, compared with the conical nose projectile, the average velocity decay rate, rotation angular rale and maximum axial impact load of the body after the head stepped modification are reduced to 66.1%, 40% and 77. 2% respectively. The motion stabilitity is improved significantly.
AB - In order to study the influence of motion parameters and warhead shape on the oblique entry process of a projectile into water, adopting volume of fraction of gas-liquid two-phase flow and water vapor cavitation model. The three-dimensional kinematics and dynamics of the rigid body were coupled by nested grids, and the motion process of the projectile in the stage of speed 80-100 m/s tilting into water and opening cavitation process was simulated. According to the literature experiments, the prediction errors of the velocity and displacement of the underwater projectile are 0-6% and-8% ~ 0, and the rotation angle error is-6% ~ 0. Through the simulation study of the water entry velocity and angle of entering water under multiple working conditions, it is found that with the increase of the water entry velocity, the axial impact load of the projectile increases. The maximum load is linearly related to the square of the speed, and the nonlinear attenuation rale of the velocity is large. The larger the angle of entry, the smaller the angular rate of rotation of the projectile body, the stronger the stability of movement. But the velocity decay rate is not affected by the angle of entry. The projectile body adopted a stepped head modification, compared with the conical nose projectile, the average velocity decay rate, rotation angular rale and maximum axial impact load of the body after the head stepped modification are reduced to 66.1%, 40% and 77. 2% respectively. The motion stabilitity is improved significantly.
KW - CFD
KW - equation of motion
KW - unsteady flow
KW - water entry ballistics
KW - water entry cavity
UR - http://www.scopus.com/inward/record.url?scp=85166670751&partnerID=8YFLogxK
U2 - 10.11887/j.cn.202304011
DO - 10.11887/j.cn.202304011
M3 - 文章
AN - SCOPUS:85166670751
SN - 1001-2486
VL - 45
SP - 115
EP - 123
JO - Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology
JF - Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology
IS - 4
ER -