| 摘要 |
A fan in which the root-to-tip net blade skew angle (Ab) (either forward or rearward) is less than 1/2 of the blade spacing; in a first radially inward region of the blade, the blade is rearwardly skewed as indicated by the leading edge skew angle (Ae); in a second region radially outward of the first region, the leading edge skew angle indicates a forward skew.
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