Fan noise reduction from turbofan engines using adaptive Hersche

Details Fan noise reduction from turbofan engines using adaptive Hersche Fan noise reduction from turbofan engines using adaptive Hersche

1998-09-24

2000-09-05

Freay, Charles G.

Power plants

Reaction motor

Interrelated reaction motors

181250, 181213, F02K 302

Patent

active

061125148

ABSTRACT:
An array of adaptive or fixed Herschel-Quincke tubes aligned in a circumferential or helical array about an inlet of a turbofan engine. The array of tubes effectively divide the acoustic energy generated by the engine. One of the energy components propagates within the tubes while the other propagates within the engine compartment. At some time certain, the acoustic energy in the tubes is reintroduced into the engine compartment to cancel the acoustic energy remaining in the engine as it propagates from the fan towards the inlet and outlet openings.

REFERENCES:
patent: 3951566 (1976-04-01), Mattei et al.
patent: 4199295 (1980-04-01), Raffy et al.
patent: 4255083 (1981-03-01), Andre et al.
patent: 5033581 (1991-07-01), Feuling
patent: 5732547 (1998-03-01), Olsen et al.
patent: 5952621 (1980-04-01), Curtis et al.

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