Sound-attenuating inlet duct

Details Sound-attenuating inlet duct Sound-attenuating inlet duct

1975-05-14

1977-09-20

Tomsky, Stephen J.

Acoustics

Sound-modifying means

Sound absorbing panels

181284, F04B 3900, B64D 3306

Patent

active

040490742

ABSTRACT:
A sound-attenuating inlet duct is provided for a gas turbine engine wherein the inlet duct includes a casing defining, in serial flow relationship, a minimum area throat of predetermined axial extent, a diffuser and a cylindrical section. Sound-absorbent acoustic material is disposed upon the inner walls of the duct in the cylindrical section. A first amount of acoustic attenuation is provided by accelerating the motive fluid to high subsonic velocities through the throat. A second amount of acoustic attenuation is provided by locally accelerating the motive fluid in the vicinity of the acoustic material, thereby imparting a velocity component to the acoustic waves which is normal to the acoustic material, thereby enhancing absorption. By sizing the various sections of the inlet duct in a unique predetermined relationship the effects of the two sources of acoustic attenuation may be made additive.

REFERENCES:
patent: 2763426 (1956-09-01), Erwin
patent: 3508838 (1970-04-01), Martenson
patent: 3532129 (1970-10-01), Ward et al.
patent: 3542152 (1970-11-01), Adamson et al.
patent: 3692141 (1972-09-01), Labussiere et al.
patent: 3702220 (1972-11-01), Medawar et al.
patent: 3765623 (1973-10-01), Donelson et al.

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