초록 ▼

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 introduci

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.

대표청구항 ▼

In an apparatus for suppressing infrared radiation emitted from hot metal parts at the aft end of a gas turbine engine and from the exhaust gas plume thereof during engine operation comprising: a dual purpose ejector vane assembly operatively associated with said engine for introducing cooling ambie

In an apparatus for suppressing infrared radiation emitted from hot metal parts at the aft end of a gas turbine engine and from the exhaust gas plume thereof during engine operation comprising: a dual purpose ejector vane assembly operatively associated with said engine for introducing cooling ambient air into the hot engine exhaust gases and hiding said hot metal parts and means supporting said vane assembly in operative association with said engine wherein said vane assembly further comprises: a tubular duct structure for receiving and confining said engine exhaust gases consisting of two cooperating portions defined by an upstream portion and a downstream portion, said upstream portion having a discharge end of a particular area, said downstream portion having an inlet end provided with an inlet area which is larger than said particular area to define an annular space therebetween for receiving additional cooling ambient air therethrough by ejector action during said engine operation; and at least one tubular vane constructed in said downstream portion providing at least one stream of cooling ambient air completely across said downstream portion to mix with the exhaust gases confined thereby, said tubular vane being constructed of a single thickness metal sheet which has aligned slits therein defining air jets which cooperate to emit by ejector action the stream of cooling ambient air.