Research on Gas-liquid Interaction Characteristics during the Gas Curtain Launching Process of Underwater Gun

doi:10.3969/j.issn.1000-1093.2016.08.005

Abstract

Abstract: A visualization simulator is designed to understand the characteristics of interaction between combustion gas jet and liquid medium during the gas-curtain launching process of underwater gun. A high speed video camera system is used to record the motion of projectile in a cylindrical liquid-filled chamber and the gas-liquid interaction process. The flying velocity of projectile and the axial expanding speed of gas curtain are acquired in experiment. Experimental results show that the projectile velocity increases with the increase in injection pressure. With the increase in sizes of oblique nozzles, the drag reduction property of gas curtain is improved, and the projectile velocity is also increased. On the base of experimental study, an unsteady three-dimensional mathematical model is developed to simulate the expansion of multi-combustion gas jets in liquid medium. And a numerical simulation is carried out. The simulated expansion process of the multi-gas jets is consistent with the experimental result, and the axial displacement of simulated gas curtain is in a good agreement with the experiment data. The proposed numerical model provides a reference for the analysis of generation mechanism of gas curtain during launching.

Key words: ordnance science and technology, underwater gun, underwater gas curtain, multi-combustion gas jet, gas-liquid interaction, experimental study, numerical simulation

CLC Number:

TJ399

ZHOU Liang-liang，YU Yong-gang，LIU Dong-yao，MANG Shan-shan. Research on Gas-liquid Interaction Characteristics during the Gas Curtain Launching Process of Underwater Gun[J]. Acta Armamentarii, 2016, 37(8): 1373-1378.

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