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@inproceedings{faucris.221552880,
abstract = {Axial fans are used in a variety of technical systems such as air conditioners,
trains, cars and ventilation systems. In these systems, axial fans are a dominant
source of noise. Based on the investigations of flat-plate fans and airfoils, it has
been found that serrated leading edges reduce the sound radiation compared
with a straight leading edge. In this study, the sound emission of axial fans with
leading-edge serrations, applied to dierent spanwise locations of the fan blade,
was investigated. For that three fans with different leading-edge configurations
(fully serrated, serrations on the outer 2/3 and 1/3 of the fan blade) and a reference
fan without serration were examined experimentally. The results showed that
leading-edge serrations influence the sound emissions of the axial fans. For high
volume flow rates, the serrations led to a reduction of the sound radiation - the fan
with serrations on the full span showed the highest sound reduction. For low volume
flow rates, the sound emission was increased with the leading-edge serrations.