Patent ID: 7891195
Filing Date: 2011-02-22
Classification: F02K,F05D,Y02T

Abstract:
1. A central body disposed within an outer casing of a turbojet gas exhaust nozzle, defining a primary gas stream flow path therebetween, comprising: a first wall forming a first cavity, the first wall disposed between the first cavity and the primary gas stream flow path, and the first wall and the first cavity disposed downstream of a final turbine stage; and a plurality of orifices through at least one upstream portion of the first wall, wherein the plurality of orifices are in fluid communication with the first cavity and the primary gas stream flow path, wherein the first cavity and the plurality of orifices compose a Helmholtz resonator with a single resonance cavity, wherein the single resonance cavity is the only resonance cavity in the central body in fluid communication with the primary gas stream flow path, and wherein the plurality of orifices are configured to attenuate noise bypassing acoustic waves while limiting a convective flow through the plurality of orifices and the first cavity.