Exploring the suppression mechanism of wind buffeting noise with bionic structures featuring leading-edge serrations and surface ridges

The aim of this study is to investigate the effectiveness and mechanism wind buffeting noise suppression using a new bionic structure inspired by quiet flight owls. Firstly, schemes based on NACA0012 wing with two sinusoidal leading-edge serrations one straight curve are used in cavity after verifying simulation. Then, results three compared analyzed. It found that surface ridges can suppress effectively. In particular, scheme wavelength λ = 0.24 c (chord length c) significantly reduce resonance energies above 21 dB over wide range speeds. Furthermore, reveals scheme, only negative pressure core moves opening hits trailing edge, which reduces fluctuation cavity. boundary layer thickness (BLT) also fluctuates span under influence serration ridge, favorable for suppressing noise. However, effect not solely related BLT at edge but influenced minimum point. Therefore, if has certain intensity span, close smooth airfoil significant.