Near Exit Plane Effects Caused by Primary and Primary-Plus-Secondary Tabs

Triangular-shaped tabs, attached to the separation lip of a nozzle, have been shown to provide substantial increases in the convective transport-mixing in a jet’s near eld. Detailed information is reported on the basic features of such tab ows made available by 1) the large-scale tab and 2) the nely resolved pressure/velocity measurements. Secondary tabs were placed next to, and pointed away from, the primary tab; the motivationwas to enhance the outward directed ow from the jet’s core region. The strong mixing enhancement, provided by these optimally oriented (pitch angle = 40 deg) secondary tabs, is detailed.