Acoustic liner
SANDWICH PANEL MADE BY POROUS FACING SHEET (E.G. PERFORATED METAL SHEET), A HONEYCOMB LAYER, AND AN IMPERVIOUS BACK-SHEET. IT USED TO LOWER THE NOISE OF AIRCRAFT ENGINES VIA HELMHOLTZ RESONANCE
Draft:Acoustic liner; Acoustic liners
Aircraft engines, typically turbofans, use acoustic liners to damp engine noise. Liners are applied on the internal walls of the engine nacelle, both in the intake and by-pass ducts, and use Helmholtz resonance principle for the dissipation of incident acoustic energy.