Improved delayed detached eddy simulation of a porous wavy trailing edge

Abstract

This paper proposes a novel trailing-edge treatment to reduce trailing-edge noise. Prior studies showed that both porous materials and wavy trailing edges have decent trailing-edge noise reduction. Therefore, a combination of porosity and waviness, or a porous wavy trailing edge, could possibly result in greater noise reduction. Improved delayed detached eddy simulations are performed to compare the aeroacoustic performance of a porous wavy trailing edge to those of clean airfoil, porous trailing edge, and wavy trailing edge. It is revealed that a porous wavy trailing edge reduces the overall sound pressure level by 8.1 dB without compromising the aerodynamic efficiency. The detailed flow physics of noise reduction with a porous wavy trailing edge is also investigated. Overall, the current research provides a low-noise solution for wind turbines and the future's ultra-quiet aircraft.