Abstract: Fluid mixing apparatus for mixing the coaxially flowing streams of fan air and primary exhaust within a turbofan engine are disclosed. Each of the disclosed arrangements include a generally tubular mixer section that extends axially rearward from the engine turbine flange. The mixing apparatus includes axially extending regions in which contiguous portions of the fan stream are induced to flow radially inward to penetrate the primary flowstream and includes axially extending regions in which contiguous portions of the primary flowstream are induced to flow radially outward to penetrate the fan stream. The regions inducing the outwardly directed flow of the primary flowstream and the regions inducing the inwardly directed flow of the fan stream are circumferentially interspersed with one another to establish a flow pattern which causes mixing to occur along the axial length of the mixing apparatus and causes mixing to continue within a common exhaust duct located aft of the mixing apparatus.

Abstract: A cascade/clamshell thrust reverser combination for jet engines wherein the clamshell door in the full-forward thrust mode position, covers a cascade arrangement of vane members provided in the annular engine casing. For obtaining the thrust reverser mode, a track and pivot mechanism is employed. Initially, the door moves backwards on the track while simultaneously slightly rotating so that the total movement of the door follows a predetermined arc. During this initial movement the first portion of the vanes are gradually exposed. Upon continuation towards the full reverser mode, the door will move into a rotating movement thereby fully exposing all vanes and closing the forward thrust nozzle opening. The successive combined track/pivot movement to a pivot rotating movement allows for the maneuvering of a maximum large structural sized clamshell door within the multiple contoured confines of the exit casing, thereby providing the most optimum thrust reverser effect.

Abstract: Fluid mixing apparatus for mixing the coaxially flowing streams of fan air and primary exhaust within a turbofan engine are disclosed. Each of the disclosed arrangements include a generally tubular mixer section that extends axially rearward from the engine turbine flange. The mixing apparatus includes axially extending regions in which contiguous portions of the fan stream are induced to flow radially inward to penetrate the primary flowstream and includes axially extending regions in which contiguous portions of the primary flowstream are induced to flow radially outward to penetrate the fan stream. The regions inducing the outwardly directed flow of the primary flowstream and the regions inducing the inwardly directed flow of the fan stream are circumferentially interspersed with one another to establish a flow pattern which causes mixing to occur along the axial length of the mixing apparatus and causes mixing to continue within a common exhaust duct located aft of the mixing apparatus.