Research on the drainage mechanism of a novel gun barrel and the characteristics of gas–liquid mutual interference

• Published in: Physics of fluids (1994) 2024-06, Vol.36 (6)
• Main Authors: Zhang, Xuan, Yu, Yong-gang, Zhang, Xue-min, Zhang, Xin-wei
• Format: Article
• Language: English
• Subjects: Circular tubes; Completion time; Drainage; Drainage measurement; Gas flow; Gas jets; Gas-liquid interactions; Grooves; Numerical models; Phase change; Underwater
• ISSN: 1070-6631; 1089-7666
• DOI: 10.1063/5.0209200

An underwater shooting method with a novel barrel structure featuring spiral grooves is designed by opening multiple spiral grooves on the gun barrel's tail inner wall, and the combustion-gas flows are guided to create multiple gas jets that are sprayed into the barrel to form a gas curtain for water drainage. A three-dimensional unsteady multiphase mathematical model was created, and the correctness of the numerical model established was verified by comparing it with the experimental results of underwater gun gas curtain drainage visualization. On this basis, the influence of different spiral grooves on the evolution process of gas jet and liquid and the drainage effects were simulated. The results indicate that the phase change happens in close proximity to the gas–liquid boundary; nonetheless, the volume percentage of vapor generated by phase change during gas–liquid interaction is less than 1%. The more grooves there are, the greater the maximum pressure at each moment inside the fully filled circular tube; the temperature at the front end of the circular tube becomes higher. When the number of grooves is increased from 4 to 6, the drainage completion time is shortened by 29.7%, the amount of gas in the circular barrel increased by 5.2%, and the drainage rate is significantly increased. However, as the amount of grooves increased from 6 to 8, the gas volume fraction and drainage rate in the tube only increased slightly. On the contrary, it takes a little more time to complete the drainage.