Abstract: An infrared radiation suppressor secured to the discharge end of a gas turbine engine has a series of movable vanes maintained in an open trailing edge configuration in which they form converging flow passages for the gases emanating from the gas turbine engine and passing between the vanes, thereby decreasing the gas static pressure at the vane trailing edges below ambient levels. Flow passages in heat exchange relationship with the duct walls of the suppressor carry ambient air through the passages to a point downstream of the vanes. The lowered static pressure at this point causes ambient air to flow through the passages and into the gas stream, thereby cooling the duct walls and the gas stream. The hollow center of the movable vanes are also open to ambient air at the outer ends. The lowered static pressure at the vane trailing edges also causes large quantities of ambient air to enter into the hollow vanes and out the trailing edges into the gas stream further cooling the gases.

Abstract: 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 during engine operation is provided and comprises a multiple purpose ejector vane assembly operatively attached to the engine for introducing cooling ambient air into the hot engine exhaust gases and hiding the hot metal parts and means attaching the vane assembly to the engine with the vane assembly comprising a duct structure for receiving and confining the engine exhaust gases and a plurality of radial ejector vanes supported by the duct structure for introducing cooling ambient air into hot engine exhaust gases during engine operation by ejector action while simultaneously imparting a spiral swirl to both the cooling ambient air and the exhaust gases with the swirl promoting mixing of ambient air within the duct structure and causing additional entrainment of ambient air downstream of the duct structure.

Abstract: 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 is provided and such apparatus comprises a dual purpose ejector vane assembly operatively attached to the engine for introducing cooling ambient air into the hot engine exhaust gases and hiding the hot metal parts. The vane assembly has a duct structure for receiving and confining the engine exhaust gases and the assembly provides at least one stream of cooling ambient air across one full dimension of the duct structure and exhaust gases confined thereby with the stream of cooling ambient air mixing with the hot engine exhaust gases across the full dimension of the duct structure to assure optimum mixing thereof.