Apparatus and method for reducing noise emissions from a gas tur

Details Apparatus and method for reducing noise emissions from a gas tur Apparatus and method for reducing noise emissions from a gas tur

1996-08-09

1997-12-30

Ferensic, Denise L.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

181212, 602261, F01D 2500, F01N 700

Patent

active

057022313

ABSTRACT:
Noise attenuating linings for a turbofan engine inlet are installed around the upper crown area and/or around the lower lip. The acoustical lining at the upper crown area attenuates those fan noise emissions which are normally reflected from the crown area downward toward the ground. The acoustical lining at the lower inlet lip attenuates those fan noise emissions which travel along the inner surface of the lip and are diffracted around the lower lip downward toward the ground.

REFERENCES:
patent: 3890060 (1975-06-01), Lipstein
patent: 3946830 (1976-03-01), Kutnet et al.
patent: 4534167 (1985-08-01), Chee
patent: 4786231 (1988-11-01), Kelley
patent: 4828175 (1989-05-01), Heufler et al.
patent: 5058617 (1991-10-01), Stockman et al.

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