Initial flow characteristics of an underwater supersonic gas jet

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 88-93.

ZHANG Huanhao，GUO Zeqing，WANG Ruiqi，CHEN Zhihua，HUANG Zhengui

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Abstract

To investigate the evolution and the characteristics of flow structures during the high-pressure and high-temperature propellant gases injecting into water in the launching process of an underwater gun, a two-dimensional axis-symmetric model of the underwater supersonic gas jet was established via the Mixture model and Evaporation-condensation model. A relative numerical simulation was conducted and the initial flow structure of the underwater supersonic gas jet was obtained. The numerical results illustrate that a highly pressed region forms on the gas-liquid interface due to the strong impact between the supersonic gas and water, and the continual impact generates the reflection of the pressure wave, which causes periodic impulses in the core flow region at the nozzle’s exit. In addition, complex shocklets structures form in the gas-liquid hybrid region due to the strong shear effect on the gas-liquid interface, which accelerates the instability of the gas-liquid interface and promotes the gas-liquid mixing effect. Moreover, the typical underexpanded jet structure forms inside the bubble, whose flow characteristic is similar to that of a single phase supersonic gas jet.

Key words

underwater supersonic gas jet / gas-liquid flow / bubble motion / shocklets / numerical simulation

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ZHANG Huanhao，GUO Zeqing，WANG Ruiqi，CHEN Zhihua，HUANG Zhengui. Initial flow characteristics of an underwater supersonic gas jet[J]. Journal of Vibration and Shock, 2019, 38(6): 88-93

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