| 摘要 |
An apparatus for and method of suppressing infrared radiation emitted from hot metal parts at the aft end of a gas turbine engine and from the exhaust gas plume thereof are provided and such apparatus comprises a dual purpose ejector vane assembly operatively associated with the engine for introducing cooling ambient air into the hot engine exhaust gases and hiding the hot metal parts wherein the assembly comprises a tubular duct structure comprised of two cooperating portions defined by an upstream portion and a downstream portion with the upstream portion having a discharge end of a particular area and the downstream portion having an inlet end provided with an inlet area which is larger than the particular area to define an annular space therebetween for receiving cooling ambient air therethrough by ejector action during operation of the engine, and one of the portions has at least one vane providing at least one stream of cooling ambient air by ejector action completely across the duct structure which serves to break the exhaust gases confined thereby into a plurality of separate exhaust gas streams and provide mixing of the one stream with the exhaust gases completely across the duct structure and wherein the assembly provides a substantial amount of cooling ambient air with maximum air film cooling of metal parts of the assembly and maximum dilution of the exhaust gas plume for a minimum infrared signal.
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