Patent ID: 6135238
Filing Date: 2000-10-24
Classification: B64C,B64D,F02C,F02K,Y02T

Abstract:
An extended reaction acoustic liner for use in jet engine noise mitigation, the liner comprising:a) a substantially non-porous outer layer; andb) a plurality of alternating layers of honeycomb core and porous inner layers disposed in laminar juxtaposition to the outer layer, each layer of honeycomb core comprising a plurality of cells, each of the cell walls having a plurality of microporous openings sized and configured to channel laminar airflow therethrough, the mircroporous openings each having a frictional inner surface, some of the cells being in fluid communication with one another via the openings formed in the cell walls thereof;c) wherein the opening in the cell walls cause viscous acoustic losses, resulting in acoustic energy dissipation and enhanced noise attenuation.