초록 ▼

A moderately high bypass ratio turbofan engine nozzle (36) is provided including an outer structure (46) and one or more ejectors (38). The ejectors (38) include inner and outer doors (82), (80) for closing off an ejector passage (76) extending through the outer structure (46). The ejectors (38) are

A moderately high bypass ratio turbofan engine nozzle (36) is provided including an outer structure (46) and one or more ejectors (38). The ejectors (38) include inner and outer doors (82), (80) for closing off an ejector passage (76) extending through the outer structure (46). The ejectors (38) are sized to entrain exterior air (40) at aspiration ratios of generally less than 60%. The exterior air (40) is mixed with engine exhaust (42), resulting in a lower combined airflow velocity which in turn reduces jet exhaust noise. Mixing components formed as turning vanes (108) are located in the ejector passage (76) for encouraging further mixing of the airflows (40), (42). In preferred embodiments, the nozzle (36) further includes a translatable centerbody (52), an aft flap assembly (112), and a control system (122) for controlling the movements of the nozzle components. A method of suppressing aircraft moderately high bypass ratio turbofan engine exhaust noise including entraining exterior air to engine exhaust at an aspiration ratio of less than about 60%.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] An exhaust nozzle for suppressing engine noise of a moderately high bypass ratio aircraft turbofan engine, the nozzle comprising:(a) nozzle sidewalls and a centerbody located withi

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] An exhaust nozzle for suppressing engine noise of a moderately high bypass ratio aircraft turbofan engine, the nozzle comprising:(a) nozzle sidewalls and a centerbody located within the nozzle sidewalls, the area between the centerbody and the nozzle sidewalls defining an exhaust duct for passage of engine exhaust that includes both primary exhaust and bypass airflow;(b) an ejector having an open position and a close position, the open position allowing the entrainment of exterior air into the exhaust duct in amounts equal to or less than about 60% of the engine exhaust; and(c) a control system having at least one input indicative of current flight conditions, the control system being in communication with the ejectors to cause the ejector to assume its open position during at least one of takeoff and landing approach conditions.