| 摘要 |
<p>A description is given of untwisted blade (1) for axial-flow fan, equipped, along the trailing edge, with flag (3) sloped to body (2) of blade (1), where said flag (3) is extensional to profile mean line of said body (2) of blade (1) and has a width (5) exceeding that of the flag of known blades. Said new blade is less noisy and of higher performance than the blades already known. <MATH></p> |
