Method of operating an aircraft bypass turbofan engine...

Details Method of operating an aircraft bypass turbofan engine... Method of operating an aircraft bypass turbofan engine...

F - Mech Eng,Light,Heat,Weapons

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F01D 17/20 (2006.01) F01D 17/16 (2006.01) F02C 9/48 (2006.01) F02K 1/06 (2006.01) F02K 3/06 (2006.01)

Patent

CA 2113367

A method of operating an aircraft bypass turbofan engine having variable fan outlet guide vanes. In a first embodiment, an engine out condition is sensed, fan rotor speed is repeatedly measured, and vane pitch is adjusted to a predetermined value as a function of the fan rotor speed to generally maximize airflow through the vanes during the engine out condition. In a second embodiment, vane pitch is adjusted to a preselected value as a function of fan rotor speed to generally minimize engine noise during a noise reduction mode of engine operation.

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