Structural characteristics of the strong interaction between oblique shock wave and streamwise vortex

Abstract

Structural characteristics of the strong interaction between an oblique shock wave and streamwise vortex are experimentally investigated based on the nanoparticle-based planar laser scattering technology. Fine structures of reorganized vortices and helical structures are first recorded in experimental visualization. For the case with the strongest shock wave, a catastrophe process occurs due to the change of breakdown type, which gives birth to abundant small-scale vortical structures. Fractal and feature analyses indicate that the turbulent mixing dramatically increases after the interaction, especially for the case with spiral breakdown.