Closed cavity noise suppressor

Details Closed cavity noise suppressor Closed cavity noise suppressor

1988-11-25

1990-07-31

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181286, 181288, 181292, 181293, B64F 126, F02K 182

Patent

active

049443623

ABSTRACT:
An annular acoustic liner for gas turbine engine ducts comprising Helmholtz resonator chambers wherein the resonator's turnable neck length and chamber depth lie on a surface which is concentric to the liner centerline. In another embodiment of the invention the liner is generally rectangular and the resonator's turnable neck length and chamber depth lie on a surface which is parallel to the duct flow. A more particular embodiment of the invention the duct is an afterburner duct which may have a rectangular or circular cross section.

REFERENCES:
patent: 3437173 (1969-04-01), Ehrich
patent: 3819007 (1974-06-01), Wirt et al.
patent: 4150732 (1979-04-01), Hock et al.
patent: 4189027 (1980-02-01), Dean, III et al.
patent: 4645032 (1987-02-01), Ross et al.
patent: 4747467 (1988-05-01), Lyon et al.
patent: 4821841 (1989-04-01), Woodward et al.

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