A High-Speed PIV Study on Trailing-Edge Noise Sources

Abstract

Airframe noise is essentially due to the interaction of unsteady, mostly turbulent flow with the structure of the airplane, particularly caused by vortical flows around edges or over open cavities. A classical problem in this field is the trailing edge noise, which involves different noise generating mechanisms. Extensive investigations have been conducted on airfoil- and on flat plate trailing edges. According to [380, 381, 382] the major noise contribution is provided by the span-wise component of vorticity, the corresponding dipole (”principal edge noise dipole”) is the sc. perturbed Lamb vector being perpendicular to the plane of the plate. A numerical simulation of trailing edge noise can be performed, based on such HS-PIV input data.