Acoustic liner for gas turbine engine
AssigneeROLLS-ROYCE plc
InventorsAndrew J Kempton, Nicholas J Baker, Alan McAlpine, Jeremy Astley
Life of this patent
Estimating the term…
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.
Claims11
A passive acoustic liner system for attenuating a sound field comprising, in acoustic series, a mode-scattering segment and a sound-absorbing segment, wherein the mode scattering segment provides a reactance between −12 and −2 ρc and the sound absorbing segment provides a reactance between −1 and 0 ρc thereby providing a reactance discontinuity such that mod-scattering of the sound field enables the sound absorbing segment to further absorb the scattered sound.
Dependencies are inferred from the claim text.