Noise-suppressing jet engine nozzles and method

Details Noise-suppressing jet engine nozzles and method Noise-suppressing jet engine nozzles and method

1979-05-08

1981-07-28

Myracle, Jerry W.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

60262, F02K 134

Patent

active

042805872

ABSTRACT:
A discharge nozzle of a jet engine has lobes, tubes or deflectors for promoting mixing of the engine discharge flow with ambient air to reduce jet noise. By providing the lobes, tubes or deflectors at only the upper portion of the discharge nozzle, jet noise perceived below the engine is reduced substantially without shifting the noise spectrum to include a higher proportion of piercing and irritating high frequency noise components. Additionally, in a turbofan, the fan or secondary flow is discharged below the primary exhaust flow to further reduce noise perceived below the turbofan.

REFERENCES:
patent: 3174282 (1965-03-01), Harrison
patent: 3393518 (1968-07-01), Bridge
patent: 3495682 (1970-02-01), Treiber
patent: 3527317 (1970-09-01), Motsinger
patent: 3543876 (1970-01-01), Karlson
patent: 3583640 (1971-06-01), MacDonald
patent: 3612212 (1971-10-01), MacDonald
patent: 3618701 (1971-11-01), MacDonald
patent: 3964568 (1976-06-01), Neumann
patent: 3968853 (1976-07-01), Hoch et al.
p. 207 from McGraw-Hill Encyclopedia of Science and Technology.

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