Experimental investigation of base pressure using micro jets at low supersonic Mach numbers with sudden expansion

This exploration shows the consequences of an effort to regulate base pressure inside the recirculation sector. The study focuses on the efficacy of stream regulators in controlling base pressure in a duct with abrupt expansion. Tiny jets of 1 mm in diameter are placed at a period of ninety degrees at a pitch circle diameter of 13 mm. The Mach numbers considered range from 1.25 to 1.6. Circular brass pipes were employed with the nozzles, and the diameter ratio of the tubes was 1.6, 1.8, 2.2, and 2.5. The L/D ratio considered was from 1 to 10, and the nozzle pressure ratio used ranged from 3 to 11. The base pressure varies with the expansion level and the nozzle's inertia levels. In establishing the base pressure, the nozzle pressure ratio plays a vital part in setting its scale. While the flow was released into the duct with the area ratios, it remained connected to the duct at all inertial levels and at the NPRs assessed in the present study. Further, it is observed that the nozzle pressure ratio is a vital parameter that significantly influences base pressure and control capability.