Supersonic Mixing Enhancement Using Interactions between Supersonic Streamwise Vortices in Double Spanwise-Row Configurations.

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This paper presents our experimental results of supersonic mixing enhancement using interaction between two spanwise-rows of counter-rotating supersonic streamwise vortices. Experiments were carried out in a Mach 2.45 air stream. Streamwise vortices were generated by two 'Alternating-Wedge Struts' in biplane configurations. Schlieren visualizations showed that the arrangement of mutual positioning of the two rows of vortices has strong effects on their mutual interactions as well as on the evolution of turbulent eddies. Pitot pressure surveys in cross sectional planes at several streamwise locations demonstrated that large-scale convective mixing in the normal to main stream directions occurred due to the induced velocity field of the streamwise vortices and that the convective velocity normal to the main flow reached 20% of the main flow velocity. These results suggest that the supersonic turbulence and mixing in wider flow area can be efficiently controlled with little shock loss by proper utilization of interactions between multi-rows of streamwise vortices whose circulations, rotational directions, scales and their mutual positioning are properly controlled.
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