Method for attenuating the noise of a turbofan

Details Method for attenuating the noise of a turbofan Method for attenuating the noise of a turbofan

2006-09-01

2009-11-24

Donels, Jeffrey (Department: 2832)

Acoustics

Sound-modifying means

Muffler, fluid conducting type

C181S210000, C181S216000, C244S00100R, C060S226100

Reexamination Certificate

active

07621371

ABSTRACT:
A jet engine includes a hollow nacelle including a front air intake section and a rear air outlet section having outer and inner annular surfaces which converge to form a trailing edge. A fan opposite the front air intake section to generate a cold stream. A generator downstream of the fan, to generate an axial hot stream. A cowl system including a rear section with outer and inner annular surfaces which converge to form an outlet orifice for the hot stream. The trailing edge of the nacelle forms the outlet orifice for the cold stream. Blind notches attenuate the jet noise at the periphery of the outlet orifice for at least one of the streams. The notches cut into one of the convergent annular surfaces forming the outlet orifice without cutting into the other of the convergent annular surfaces.

REFERENCES:
patent: 4826106 (1989-05-01), Anderson
patent: 6360528 (2002-03-01), Brausch et al.
patent: 6532729 (2003-03-01), Martens
patent: 6751944 (2004-06-01), Lair
patent: 6971229 (2005-12-01), Lair
patent: 2002/0125340 (2002-09-01), Birch et al.
patent: 766 985 (1957-01-01), None
patent: 768 553 (1957-02-01), None
patent: 2 289 921 (1995-12-01), None
patent: 2372779 (2002-09-01), None
patent: 02/29232 (2002-04-01), None
International Search Report dated Dec. 11, 2006 w/ English translation.
Written Opinion of the ISA w/ English translation.

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