Airfoil surface impedance modification for noise reduction in turbofan engines

摘要

An aircraft engine component for reducing noise in an aircraft engine comprises a first aerodynamic surface, a second aerodynamic surface, and means for reducing noise without altering a pressure differential between the first aerodynamic surface and the second aerodynamic surface. The component has an airfoil portion (62) and said noise reduction means comprises a porous element (60) attached to a leading edge (61) of said airfoil portion (62).