Effects of owl-inspired leading-edge serrations on tandem wing aeroacoustics

Leading-edge (LE) serrations on owls’ outermost remiges play a crucial role in the silent flight of owls. While aeroacoustic characteristics LE have been widely studied using single feathers/airfoils, how they affect feather–feather (feather slots) interactions during remains unclear. Here, we present numerical analysis effects owl-inspired aeroacoustics tandem wing models. Large-eddy simulations and Ffowcs Williams–Hawkings analogy are combined to resolve flow acoustic fields around wings. The results demonstrate that serration-induced closely associated with gap distance ( D) between fore hind At low AoA 5°, as D increases, initially reduce far-field sound pressures < 0.22 c) by passively altering laminar–turbulent transition upper surfaces but turn out increase remarkedly when > c due instability induced at LE. However, high 15°, enable robust reductions for all distances mitigating instabilities vicinity trailing edge Furthermore, combination wings is verified be capable bringing nonlinear synergetic suppression fluctuations noise, which can inspire innovative biomimetic designs low-noise multirotor drones wind turbines.