Abstract
The development of organized large-scale structures in axisymmetric compressible shear layers was studied using a planar Mie-scattering flow visualization technique. Three different combinations of fully-expanded supersonic coaxial jets were used in creating the shear layers, with convective Mach number of 0.23, 0.47, and 1.1. The disturbance characteristic of the initial shear layer was changed by varying the inner nozzle lip thickness. Under certain lip- thickness conditions, large-scale vortical structures showed uncharacteristically high degree of coherence for compressible shear layers. Further tests revealed that a coupling between the compressible shear flow and lip-created wake flow was responsible for the formation of highly organized structures. The present results suggest that this mechanism can be used to modulate turbulent compressible mixing.
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