Experiments were carried out to study the effect of rectangular tabs of aspect ratio 4, with and without corrugation, on controlling the mixing of subsonic and sonic free jets. The corrugations used in the present investigation were rectangular. The blockage of the tabs without and with corrugation is 4.2% and 3.6%, respectively. The centerline pitot pressure decay for the jets, without control, with plain rectangular tabs, and with corrugated rectangular tabs, revealed that the core length reduction caused by the plain tabs is larger than that by the corrugated tabs, at all the Mach numbers studied. Up to an axial distance of about 22D, the uncontrolled and controlled jets retain their signatures. For the sonic jet, a maximum core length reduction of 32.3% was achieved with the plain tabs, whereas with the corrugated tabs the corresponding reduction was 17.63%.
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