Noise suppressing exhaust mixer for ducted-fan, turbojet engine - has annular corrugated duct positioned coaxially with sleeve including concentric bulb-shaped plug

摘要

The mixer assembly includes a sleeve, a bulb-shaped plug disposed concentrically within the sleeve, and an annular corrugated mixer duct coaxially positioned between the plug and sleeve. These components are arranged to receive the primary and fan flows and separately redirect these flows within the assembly so that the flow of primary gases is rearwardly divergent while the flow of fan air is rearwardly convergent. The shaping and dimensioning of the sleeve, plug, and mixer duct are such that optimum mixing is achieved without introducing any excessive pressure losses in the mixer assembly and nozzle.