Acoustic liner for gas turbine engine

Details Acoustic liner for gas turbine engine Acoustic liner for gas turbine engine

2006-10-24

2006-10-24

Donovan, Lincoln (Department: 2837)

Acoustics

Sound-modifying means

Sound absorbing panels

C181S210000, C181S290000, C181S293000, C415S119000, C060S725000

Reexamination Certificate

active

07124856

ABSTRACT:
A passive acoustic liner system (50) for attenuating a sound field comprising, in acoustic series, a mode-scattering segment (48) and a sound-absorbing segment (40), wherein the mode scattering segment (48) provides a reactance between −12 and −2 ρc and the sound absorbing segment (40) provides a reactance between −1 and 0 ρc thereby providing a reactance discontinuity such that mode-scattering of the sound field enables the sound-absorbing segment (48) to further absorb the scattered sound.

REFERENCES:
patent: 4192336 (1980-03-01), Farquhar et al.
patent: 5498127 (1996-03-01), Kraft et al.
patent: 5782082 (1998-07-01), Hogeboom
patent: 5979593 (1999-11-01), Rice
patent: 6206136 (2001-03-01), Swindlehurst et al.
patent: 2003/0098200 (2003-05-01), Clark
patent: 1085196 (2001-03-01), None

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