Method for reducing jet exhaust takeoff noise from a turbofan en

Details Method for reducing jet exhaust takeoff noise from a turbofan en Method for reducing jet exhaust takeoff noise from a turbofan en

1975-07-18

1976-10-26

Croyle, Carlton R.

Power plants

Reaction motor

Method of operation

60224, 60226R, 60262, 23926525, 181 33HB, F02K 304

Patent

active

039876217

ABSTRACT:
In a turbofan engine for jet aircraft the inner stream includes no noise suppression apparatus and the jet exhaust noise generated at takeoff is reduced by mechanically suppressing the jet exhaust noise of the outer stream and operating the engine at a bypass ratio, fan pressure ratio and gas generator power setting which yield a jet exhaust noise level from the suppressed outer stream which is louder than the jet exhaust noise level from the unsuppressed inner stream.

REFERENCES:
patent: 3102385 (1963-09-01), Lyons
patent: 3477230 (1969-11-01), Bauger et al.
patent: 3481427 (1969-12-01), Dobbs et al.
patent: 3579993 (1971-05-01), Tanner
patent: 3673803 (1972-07-01), McDonald
patent: 3742711 (1973-07-01), Timms
patent: 3830431 (1974-08-01), Schwartz

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