Airfoil self-noise is defined as the acoustic emission by an airfoil immersed in uniform and steady fluid flow. As in most aeroacoustic noise generation situations, it is emitted by flow unsteadiness that interacts with the body surface and leads to broadband noise. There are mainly two broadband noise-generating mechanisms: the turbulence-interaction noise, involving the breakdown of oncoming vortexes on the leading edge of the airfoil, and the boundary-layer turbulence scattering at the trailing edge, known as trailing-edge (TE) noise. In future, the increasing air traffic and the proximity of airport to the cities will produce several noise problems for the inhabitants.