Peer-reviewed veterinary case report
How bionic circular arch blades reduce axial fan noise
By Shen C et al.·2026·Jilin University, China·View original on Europe PMC →
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Original publication title: Study of the Noise Reduction Mechanism of Bionic Circular Arch Structures on the Blades of a High-Volumetric-Airflow Axial Flow Fan.
Plain-English summary
This study looked at a new design for fan blades that can help reduce noise. The researchers were inspired by the shapes of dragonfly wings and manta rays, creating a special curved structure that works better than previous designs. They tested this new design against a standard fan and found that it lowered the overall noise level by about 2.5 decibels, and in the frequency range that humans are most sensitive to, it reduced noise by up to 6.6 decibels. The findings suggest that this new structure not only makes the fan quieter but also lessens the intensity of noise coming from the blades. Overall, the new design was successful in reducing noise levels.
Abstract
While bionic sawtooth and wave structures effectively reduce aerodynamic noise on fixed airfoils, their efficacy on rotating fans is often limited. Inspired by the protrusion structures of dragonfly wings and the gentle circular arches of manta rays, this study proposes a novel bionic circular arch structure to suppress aeroacoustic noise in axial flow fans. Numerical simulations were validated against experimental data from a standard fan, showing a sound pressure level (SPL) deviation within 3 dB at the first blade passing frequency (BPF), confirming calculation accuracy. The results indicate that the bionic design reduces the total SPL by approximately 2.5 dB. Notably, in the human-sensitive frequency range of 1000-3000 Hz, noise reduction reaches up to 6.6 dB at the upstream monitoring point. Analysis of Root Mean Square (RMS) fluctuating pressure and Fourier transforms reveals that the bionic structure significantly mitigates noise source intensity at the blade tip. This design effectively reduces pressure disturbances at the first BPF and shrinks the high-intensity disturbance region of the boundary layer compared to the prototype.
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Search related cases →Original publication on Europe PMC: https://europepmc.org/article/MED/41744573