Abstract

The current investigation presents results from an investigation aimed at controlling the base pressure in the flow detached area. The investigation intends to estimate the efficiency of the stream controllers in regulating the base pressure pipes. Microscopic jets of 0.5 mm in radius are sited at a gap of 900 at 13 mm starting from the principal axis of the central jet. The inertia levels considered in the present study are M = 1.8, 2.0, 2.5, and 3.0. Axi-symmetric circular pipes were used with the nozzles, and D2 /D1 1.6 to 2.5. The L/D ratio was varied from unity to 10, and the level of expansion from 3-11. The base pressure depends on the NPR and the speed. When deciding on pressure in the recirculation area, the level of expansion plays a significant role in determining its size. Also, when the jet was released into the pipes with a fixed relief to the flow, the flow attached to the duct for all Mach numbers, and the NPRs were tested. Furthermore, the expansion level significantly affects the base pressure & the controller’s capability.

Keywords

microscopic jets, aerodynamic, mach, geometric