Affiliation:
1. National Defense Laboratories of ZNDY, Mechanical Engineering College of Nanjing University of Science and Technology, Jiangsu 210094, China
2. No. 8511 Research Institute of CASIC, Jiangsu 210007, China
3. Naval Research Academy, Beijing 100161, China
Abstract
The process of the bubble accelerating expansion plays an important role in underwater explosion, which determines the energy output and affects the bubble oscillation subsequently. In this paper, we treated the accelerating expansion cut-off state as the critical state and applied it to the division of the expansion work, energy output, and the initial condition for bubble oscillation. It found that the Rayleigh–Plesset equation was considered appropriate to investigate the roles of underwater explosion bubble accelerating expansion cut-off state compared to the Keller equation, volume acceleration model ( VAM), and pu-diagram method, and that was verified by the experimental data. Furthermore, the influence of the critical state on the expansion work and energy distribution in the accelerating expansion process was clarified, the larger critical relative volume leads to higher expansion work efficiency and total expansion work, and the shorter critical time increases the portion of the shock wave energy in the expansion work. Our finding provides a method to study the initial condition for the bubble oscillation, and that has significance in the energy output research.
Funder
National Natural Science Foundation of China
Subject
General Physics and Astronomy