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Owl-inspired leading-edge serrations for aerodynamic noise mitigation in drone propellers
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DOI：10.1063/5.0268150.png)
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Abstract
En 中文
This study examines the aeroacoustic characteristics of a large-scale baseline propeller and three bioinspired, leading-edge (LE) serrated propellers using large-eddy simulations in conjunction with the Ffowcs Williams-Hawkings acoustic analogy. The LE serrations, inspired by the wing morphology of owls, are designed to mitigate aerodynamic noise in propellers for multirotor unmanned aerial vehicles. The results show a noise reduction of up to 3 dB, with a minor aerodynamic penalty of 4-8% in the figure-of-merit. Flow field analysis reveals that the LE serrations disrupt the formation of large-scale LE vortices, alter vortex shedding dynamics, and reduce high-intensity velocity and pressure fluctuations near the blade tips, effectively lowering both broadband and tonal noise emissions. Among the serration designs tested, a moderate serration size provides the optimal trade-off between noise reduction and aerodynamic performance, highlighting the importance of geometric optimization. These findings suggest that owl-inspired LE serrations offer significant potential for quieter propulsion systems for a range of aerial platforms, including large-scale multirotor drones and emerging concepts such as flying cars.
Keywords:
AEROACOUSTICS
TURBULENCE
REDUCTION
DESIGN
MODEL
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4.3
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2.9W
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