Cooling axial flow fan with reduced noise levels caused by swept laminar and/or asymmetrically staggered blades
AssigneeDeutsche Forshungsanstalt fur Luft-und Raumfahrt e.V.
InventorDieter Lohmann
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Abstract
An axial fan for a cooling blower of a vehicle engine has fins with leading and trailing edges, and aeroacoustic optimization is provided by each of the leading edges and trailing edges having a strong forward sweep followed by a strong backward sweep in the manner of a bird's wing or by a straight forward sweeps followed by a strong backward sweep.
Claims18
An axial fan comprising a fan wheel with fins with inner and outer ends, and leading and trailing edges, the inner ends of said fins being fixed to a hub and the outer ends of the fins being fixed to a surrounding ring arranged concentrically with said hub, wherein the leading edges and trailing edges of the fins each have a forward sweep portion extending from the hub and into a flow of fluid followed by a relatively straight transition portion that is followed by a backward sweep portion extending from the forward sweep to the ring and away from the flow of fluid.
An axial fan comprising a fan wheel with fins with inner and outer ends, and leading and trailing edges, the inner ends of said fins being fixed to a hub and the outer ends of the fins being fixed to a surrounding ring arranged concentrically with said hub, wherein the leading edges and trailing edges of the fins each have a straight portion near the hub followed by a backward sweep extending from the straight portion to the ring and away from a flow of fluid.
Dependencies are inferred from the claim text.