| 摘要 |
An axial flow fan has a hub with a back plane that is perpendicular to the axis of hub rotation. The leading and trailing edges of the fan blades that bound the inner region of the respective blades are in general radial alignment with the hub. The leading portion of the tip region is swept forward relative to the back plane and the trailing portion of the tip region is swept in the opposite direction. The forward swept tip region forms an acute angle with the back plane.
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