Porous acoustic element and a method of controlling aerodynamic

Details Porous acoustic element and a method of controlling aerodynamic Porous acoustic element and a method of controlling aerodynamic

1978-09-22

1981-04-21

Dixon, Jr., William R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181280, 181296, 156191, 156195, 156188, 210510, 428 36, 428686, 428222, 428592, 428613, 428615, F01N 124, B65H 8100

Patent

active

042627702

ABSTRACT:
A porous acoustic element is disclosed having a configuration comprised of individual cross-wound porous layers of widely varying porosity, with transition plenum layers interposed therebetween having a configuration so as to prevent formation of blockages and small area openings which would be created by a direct overlay winding of differing pitch. The porosity of each wound layer increases in successive layers to compensate for expansion of the gas as it flows through the element. The resulting porous element allows gaseous flow therethrough, with maximum pressure energy dissipation and controlled velocity to minimize aerodynamic noise created by flow through valves and other flow restrictions. A specific embodiment is disclosed in which the porous layers are created by variable pitch wire ribbon cross windings and the transition layers are provided by wire mesh having relatively large openings.

REFERENCES:
patent: 2857657 (1958-10-01), Wheeler, Sr.
patent: 3067982 (1962-12-01), Wheeler, Jr.
patent: 3123446 (1964-03-01), Wheeler, Jr.
patent: 3264720 (1966-08-01), Mott
patent: 3266130 (1966-08-01), Glaze
patent: 3900629 (1975-08-01), Spencer

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