| 摘要 |
<p>A propulsive fan system (10) comprises a fan unit (11) comprising a first stage array (12) of rotatable blades (14) upstream of a second stage array (16) of rotatable blades (14). The first stage (12) is coupled to a first drive means (24). The second stage (16) is coupled to a second drive means (26). The first drive means (24) is independently operable of the second drive means (26) during operation of the fan system (10).</p> |
