Suddenly expanded flow with active controls in the form of micro jets has been investigated experimentally,
laying emphasis on the effectiveness of micro jets on the base pressure and enlarged duct pressure field. Air injection at
four locations at the base, symmetric to the nozzle axis is used as the active control. The jet Mach numbers of the present
studies are 1.87, 2.2 and 2.58. The area ratio of present study is 6.25. The length-to-diameter ratio of the suddenly
expanded duct and the Nozzle Pressure Ratio (NPR) are varied from 10 to 1 and 3 to 11. In addition to base pressure, wall
pressure field along the duct was also studied. It is found that the active control in the form of blowing through small
orifices (micro jets) are effective in controlling the base pressure field. Micro jets do not augment the flow field in the duct.
As high as 55 percent, increase in base pressure was achieved for certain combination of parameters of the present study
