Patent ID: 8297404
Filing Date: 2012-10-30
Classification: F02K,F05D,Y02T

Abstract:
1. A soundproofed exhaust duct for a turbomachine, the duct comprising: a perforated inner shell defining a flow passage of the exhaust duct; a solid outer shell, the inner and outer shells defining therebetween a space that is closed at upstream and downstream ends of said space; a core containing at least one sound energy dissipating layer made up of hollow beads that are held against one another between opposite perforated walls distinct and extending at a distance from the inner shell and the outer shell; and a frame distinct from said inner and outer shells, having upstream and downstream portions that are connected together by longitudinal members, the frame supporting the core and partitioning the core into a plurality of boxes that are filled with the hollow beads held between the two perforated walls, wherein the frame is secured to at least one of the outer shell and inner shell via at least one of the upstream and downstream portions of the frame.