| 摘要 |
<p>The invention features an axial fan (6) for passing air through a heat exchanger (12), the fan comprising a hub (4) rotatable on an axis and a plurality of blades (10), each of which extend radially outward from a root portion attached to the hub to a tip portion (15), the blades characterized by a trailing edge angle that varies by approximately 40 ° or more over the radial extent of each blade. The blade trailing edge angle is preferably greater than 60 ° at the root region.</p> |
