Primary-secondary ventilated flow mixer nozzle for high bypass turbo fan jet propulsion system

Abstract

A noise suppression high efficiency mixer nozzle for high bypass turbofan jet propulsion engines that minimizes energy losses by the provision of one or more vent openings located along the crests of the inner duct nozzle lobes to inject secondary flow into and along the primary flow boundary layers within the lobe crest interiors ahead of the locations where boundary layer flow separation otherwise tends to occur. Primary and secondary flow mixing initiated by secondary flow injection is completed within the converging terminal portion of the surrounding outer duct where the fan-shaped primary and secondary flow segments come together.