Abstract
The present contribution addresses the possibility of extracting more jet noise suppression capabilities of stationary chevron nozzle exits through unsteady excitation of secondary instabilities. An example of insertion of steady streamwise vorticity into a mixing region is given to illustrate its effectiveness in promoting enhanced mixing. Using stability theory as a guide, unsteady secondary instability of the streamwise vorticity is excited with emphasis on nonlinear effects. The averaged combined effect on the steady flow, through the Reynolds stresses, provides significant further enhancement. Possible implementation in the laboratory is discussed as is further extensions of the much-simplified considerations.
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