An investigation has been conducted at transonic stream Mach num-bers to study the effects of a cold jet issuing from the base of a cylindrical afterbody upon the afterbody and base pressures, Both sonic and supersonic conical nozzles were studied in this investigation with jet-to-base diameter ratios ranging from 0.25 to O.85. Free-stream Mach numbers ranged from 0.6 to 1.25 and the jet total-pressure ratio from the no-jet flow condition to approximately 8.0. The effect on base pressure of introducing small quantities of air into the region adjacent to the base annulus was also investigated.
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