Turbofan engine having variable geometry fan duct

Details Turbofan engine having variable geometry fan duct Turbofan engine having variable geometry fan duct

1976-12-27

1979-05-22

Garrett, Robert E.

Power plants

Reaction motor

Interrelated reaction motors

60269, 415119, 415145, F02K 306

Patent

active

041552210

ABSTRACT:
This invention is an improved turbofan engine having a variable geometry fan duct which reduces stator source noise emitted from the engine. Attached to the inner wall of the fan casing near the fan stators is a pneumatically actuated annular membrane having two operating positions. In the cruise position, the membrane is forced radially inward to press against the radially outermost tips of the fan stators. In the second position, used during approach and takeoff, the membrane is drawn against a recessed portion in the fan casing, thereby creating an annular passageway between the stator tips and the casing. When the membrane is in this position, turbulent flow from the rotor blade tips which would normally impinge on the stators is directed through the annular passageway.

REFERENCES:
patent: 3611724 (1971-10-01), Kutney
patent: 3756026 (1973-09-01), Timms et al.

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