Near-Field Interaction of a Jet with Leading-Edge Vortices

Results of the interaction between the vortex-wake of a 75-deg leading-edge sweep delta wing and a circular jet issuing from a tube parallel to the centerline of the wing are presented. Laser lightsheet flow visualizations and total pressure measurements were used to characterize the flowfield, In addition, a vortex-filament model used to supplement the examination of the streamwise evolution of jet exhaust in the presence of trailing vortices was shown to provide a reasonable qualitative description of the observed flow behavior. Visualization and total-pressure data revealed that introduction of large-scale persistent streamwise vortices substantially augments the jet spreading. Moreover, such an occurrence can he achieved within a short distance downstream