Numerical simulation of far field acoustics of an airfoil using vortex method and 2-D FW-H equation

Abstract

Airfoil self noise is the main noise source of large wind turbine blades and aircraft wings. Unsteady flow field of NACA0012 airfoil has been simulated numerically in this paper using vortex method, and validation has also been done. Far field acoustics of circular cylinder at Reynolds number equals 150, 200 and 2000 have been simulated and validated numerically in this paper, as unsteady load of target object being acoustic source. The result of far field acoustics of circular cylinder shows that the maximum sound pressure points are in the line perpendicular to the coming flow, which is consistent with other papers. And comparison with paper about NACA0012 airfoil at Re=200 shows that the directivity is in a good agreement. Work of this paper paves the way to further investigation of acoustics prediction of wind turbine blades.