Atomization characteristics of droplet under shock wave
The interaction between droplets and shocks wave exists in a rotary detonation engine,propulsion technology,fuel air explosion and other applications.The purpose of this study is to(1)investigate the behavior and evolution characteristics of droplets when they interact with shock waves.(2)establish a reliable numerical model and analyze the droplet deformation and atomization mechanism.In this paper,shock waves with different Mach numbers were generated by a shock tube and the evolution characteristics of the droplets were captured by a high-speed camera.A numerical model was established based on VOF method and adaptive mesh technique.The numerical results were compared with the experimental results to verify the correctness of the numerical model.The experimental results showed that the droplet had undergone deformation stage and atomization stage under the action of a shock wave.The increase of Mach number would significantly accelerate the droplet deformation and atomization process.The numerical results showed that the induced air flow after the shock wave contained boundary layer separation on the droplet surface.Boundary layer separation resulted in an uneven distribution of pressure on the droplet surface,which caused droplet deformation and compression.Droplet stripping was caused by the shear action on the droplet surface caused by the airflow on the side of the droplet and the standing vortex flow on the lee side.
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