Several blade-stacking strategies exist for low-pressure axial fans with potential benefits with respect to the aeroacoustic sound emission. In this study, the impact of such different blade-stacking strategies (including single-type and combined-skewed fan blades) on the fan characteristic curves, aerodynamic properties, and aeroacoustic properties was investigated. It was found that the fan aerodynamic and acoustic characteristic curves are strongly governed by the type of fan blade skew in the outer part of the fan blade. This was also observed for the flow-field on the suction side and on the pressure side. Sound pressure spectra and beamforming sound maps of the fans were further studied for one representative point in the typical fan operating range. The spectra showed similar tendencies as the fan characteristic curves, with spectra progressions being mainly dependent on the type of fan blade skew in the outer part of the fan blade. The sound maps revealed that, for the most part, sound sources are located in the outer fan region but that source characteristics may still be different for single-type and combined-skewed fans. These findings can be further used for reducing the sound emission of low-pressure axial fans with a focus on the fan blade shape in the outer part of the fan blade.
Investigation of Aeroacoustic Properties of Low-Pressure Axial Fans with Different Blade Stacking
AIAA Journal ; 56 , 4 ; 1507-1518
01.04.2018
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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