A method for calculating underwater explosion shock wave parameters of slender cone-shaped charges

被引：0
|
作者：
Xu W. [1 ]
Huang C. [2 ,3 ]
Zhang P. [2 ,3 ]
Huang Y. [1 ]
Zeng F. [2 ,3 ]
Wang X. [2 ,3 ]
Zheng X. [1 ]
机构：
[1] Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang
[2] Software Center for High Performance Numerical Simulation, China Academy of Engineering Physics, Beijing
[3] Institute of Applied Physics and Computational Mathematics, Beijing
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 01期
关键词：
Cone-shaped charge; Long duration pressure; Shock wave; Underwater explosion;
D O I：
10.11883/bzycj-2021-0095
中图分类号：
学科分类号：
摘要：
In order to estimate the underwater explosion shock wave pressure of slender cone-shaped charges and to study the characteristic of long duration shock waves, an engineering model based on the superposition principle was proposed. Cone-shaped charges are usually used to simulate the far-field shock wave of large equivalent explosives, and the wave strength is generally on the order of MPa, which can be regarded as a weak shock wave, so the problem can be simplified based on the acoustic approximation assumption. Based on the above analysis, the cone-shaped charge is divided into several small charges, and then the shock wave pressure generated by each small charge in the water is superimposed according to the propagation order of the detonation wave to obtain the shock wave pressure curve of the whole cone-shaped charge. The validity of the model was verified through experimental results. Then, the transmission characteristics and the pressure profile of the shock wave at different azimuths of the cone-shaped charge were analyzed. The results show that the shock wave is anisotropic around the charge. Long duration, low amplitude shock waves with a thick wave head are generated at the detonation end. Exponential decaying shock waves with high amplitude are formed on the side of the charge, while on the opposed side of the detonation end the amplitude and duration of the shock wave are between the former two. The differences in the shock wave distributions between the cone-shaped and spherical charges are related to their shapes and detonation methods. Due to the differences in the explosion initiation times of different parts of the explosive charge, the superimposition effect of shock waves at different azimuths is obviously different, which result in an anisotropic pressure field. The proposed method is in good agreement with the experimental and numerical simulation results, which can provide reference and basis for the power and damage assessment of the underwater explosion shock wave of the cone-shaped charges.s of cone-shaped charges. © 2022, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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