Internal Mixing Of A Portion Of Fan Exhaust Flow And Full Core Exhaust Flow In Aircraft Turbofan Engines

摘要

A method of controlling plume exhaust heat and/or noise radiation from a turbofan engine assembly having a short nacelle. A mixer duct shell is supported such that a downstream edge of the short nacelle overlays an upstream portion of the mixer duct shell. A first portion of fan exhaust may be routed through the mixer duct shell between its inner surface and an outer surface of a core engine shroud. A second portion of fan exhaust may be routed over an outer surface of the mixer duct shell. At least one of the inner surface and an outer surface of the mixer duct shell may have an acoustic lining including a honeycomb core structure.

主权项

1. A method of controlling plume exhaust heat and/or noise radiation from a turbofan engine assembly having a short nacelle, the turbofan engine assembly being mounted on an airborne mobile platform, the method comprising:
providing a mixer duct shell supported such that a downstream edge of the short nacelle overlays an upstream portion of the mixer duct shell; routing a first portion of fan exhaust through the mixer duct shell between an inner surface of the mixer duct shell and an outer surface of a core engine shroud, wherein the core engine shroud is covering a core engine, the first portion of the fan exhaust being directed towards a nozzle through which engine exhaust gasses pass; routing a second portion of fan exhaust over an outer surface of the mixer duct shell; and covering at least one of the inner surface and an outer surface of the mixer duct shell with an acoustic lining including a honeycomb core structure.