Development of Turbulent Mixing at the Gas-Liquid Interface under the Action of an Oblique Shock Wave
N. V. Nevmerzhitskii, A. N. Razin, V. V. Zmushko, E. D. Senkovskii, E. A. Sotskov, K. V. Anisiforov, E. V. Levkina
RFNC, All-Russian Research Institute of Experimental Physics, Sarov, Russia
Keywords: air-water interface, shock wave, instability, turbulent mixing
Abstract
This paper presents experimental and calculated results of studying the development of turbulent mixing at the air--water interface after the passage of an oblique shock wave. The shock-wave Mach number in the experiments varied in the range 2-2.3. The angle of inclination of the shock wave front to the interface was 0,15 °C, and 30 °C. When the shock wave was incident on the water surface, Kelvin-Helmholtz instability developed, which over time led to turbulent mixing of the substances in contact. In the experiments, the flow field structure was recorded by high-speed video cameras. It was found experimentally that with increasing angle of incidence of the shock wave on the interface, turbulent mixing increased and the droplet size of the dispersed liquid decreased due to more intense droplet fragmentation. Numerical modeling of the experiments using a two-dimensional technique shows that the technique satisfactorily predicts the dynamics of the turbulent mixing zone in the vicinity of the interface.
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