Numerical Aero-Acoustic Performance Investigation of an Axial Fan with a Bio-Inspired Structures Design

Nowadays, European standards impose stringent requirements on controlling noise emissions across various industrial fields, including aero-acoustic noise from ventilation systems. Fans are a notable source of critical and annoying noise spectra, featuring both tonal and broadband noise. Extensive research aims to reduce fan noise to meet these standards, exploring both traditional and innovative noise control solutions. Bioinspired structures, inspired by animals' evolutionary adaptations for (aero-)acoustic performance, have gained attention for their ability to attenuate low-frequency sounds and manipulate sound waves [1]. This study investigates Bio-inspired designs for reducing both tonal and broadband noise in an axial fan without compromising aerodynamic performance. Specifically, Bio-inspired structures are applied to the fan blade's trailing edge and upper surface. Numerical analyses reveal that an optimized combination of Bio-inspired structures can significantly enhance aerod...