초록 ▼

According to the present invention, there is provided a jet engine comprising a cowl, an exhaust nozzle at the rear of the engine, a plurality of vanes that extend substantially circumferentially around the cowl of the engine in the region of the exhaust nozzle, means to support the vanes on the cow

According to the present invention, there is provided a jet engine comprising a cowl, an exhaust nozzle at the rear of the engine, a plurality of vanes that extend substantially circumferentially around the cowl of the engine in the region of the exhaust nozzle, means to support the vanes on the cowl so that the vanes can be moved between a retracted position in which they lie close to the cowl and an extended position in which they are spaced apart from the cowl so that, together with the cowl, the extended vanes define a substantially annular duct having an inlet and an outlet, one or more nozzles beneath each vane for directing high pressue air into the duct in a direction towards the rear of the engine, means for feeding high pressure air from the engine to the nozzles and an actuator arrangement for moving the vanes between the extended and retracted positions. When the vanes are in their extended position, the air leaving the duct outlet creates a zone of accelerated and turbulent air surrounding the exhaust gases from the engine and this reduces the noise caused by the engine exhaust. The nozzles in the duct form an ejector (or jet) pump drawing further air in through the duct inlet.

대표청구항 ▼

A jet engine having a front and rear end, an exhaust nozzle at the rear of the engine, a cowl forwardly of the exhaust nozzle, a plurality of vanes that extend substantially circumferentially around the cowl of the engine adjacent the exhaust nozzle, means to movably support the vanes on the cowl so

A jet engine having a front and rear end, an exhaust nozzle at the rear of the engine, a cowl forwardly of the exhaust nozzle, a plurality of vanes that extend substantially circumferentially around the cowl of the engine adjacent the exhaust nozzle, means to movably support the vanes on the cowl so that the vanes can be moved between a retracted position close to the cowl and an extended position spaced apart from the cowl so that, together with the cowl, the extended vanes define a substantially annular duct, at least one nozzle beneath each vane for directing air from the engine into the annular duct in a direction towards the rear of the engine for feeding high pressure air from the engine to the at least one nozzle beneath the vanes, and an actuator for moving the vanes between the extended and retracted positions.