| 摘要 |
A propeller has a hub (1, Fig 1) and a number of blades (3, Fig 1) attached to the hub. The blades each include a body having a radially inner root (4, Fig 1) connected to the hub, a radially outer tip (5, Fig 1), and an intermediate section (6, Fig 1) extending along at least 90% of the length of the blade between the root and the tip. At every radial position along the intermediate section, across substantially the full width of the blade, the pitch of a pressure side 13 of the blade is greater than the pitch of the opposite suction side 12 of the blade to increase the velocity of water flow at the outlet end of the propeller relative to the velocity of water flow at the inlet end of the propeller. The suction side of the blade may be convex and the pressure side of the blade may be concave. |
