The Evolution of Gas-liquid Flow of Multiple Combustion Gas Jets in a Cylindrical Water-filled Chamber

doi:10.3969/j.issn.1000-1093.2016.10.012

Abstract

Abstract: The injection process of multiple high-pressure combustion gas jets is observed experimentally and simulated numerically during gun firing underwater. The gas is generated by gunpowder burning and injected into a cylindrical water-filled chamber through simulated bullet. In experiment, a high-speed camera system is used to record the injecting process of air. The volume-of-fluid method is used to describe the expansion of the gas cavities in water. The numerical results show a good agreement with experimental observations. Numerical simulations show that the gas pressure along the axis of orifice reaches a steady value after declining and rising. A pressure peak appears in the water near the gas cavity under the effect of combustion gas, and then is gradually attenuated. During the expansion of the gas cavities, the pressure distribution of gas-water flow field on a cross section away from nozzle is relatively uniform, and the average pressure on the section decreases with the expansion in the cavity. The area fraction of gas on the section could be up to 70% over time.

Key words: ordnance science and technology, gas-water interaction, multiple combustion gas jet, turbulent mixing, numerical simulation

CLC Number:

O358

ZHAO Jia-jun, YU Yong-gang. The Evolution of Gas-liquid Flow of Multiple Combustion Gas Jets in a Cylindrical Water-filled Chamber[J]. Acta Armamentarii, 2016, 37(10): 1852-1859.

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