Aeroacoustic assessment of leading edge bumps in industrial fans

Stall control is a key technology for industrial fans. In tunnel and metro applications this technologies are regarded as a key assets, as regulatory and operational conditions limit the viable design choices. In an ongoing investigation we are assessing the stall control capabilities of biomimicry-derived sinusoidal leading edges. In the present paper we focus on the prediction of acoustic emissions of blades with sinusoidal leading edges and compare the acoustic performance with that of the datum blade with straight leading edge. To this aim we performed URANS calculation with the non-linear low-Reynolds model of Lien et al. and applied SPL prediction from Fukano et al. The paper demonstrate an overall decrease of SPL and a redistribution of Powell’s sound sources along the blade surface.