Airfoil surface impedance modification for noise reduction in turbofan engines

摘要

An aircraft engine is provided with a component (10) which helps reduce the noise generated by the engine. The component (10) has a first aerodynamic surface (16), a second aerodynamic surface (18), and a system for reducing noise without altering a pressure differential between the first aerodynamic surface and the second aerodynamic surface. The system preferably comprises, in one embodiment, said component having a plurality of cells (22) , each said cell being bounded by one of said aerodynamic surfaces (16, 18) and having an opening (20) for receiving a portion of a fluid flowing over said one aerodynamic surface, and means (26) for preventing said fluid in said cells from flowing from said one aerodynamic surface to the other of said aerodynamic surfaces.