| 摘要 |
An axial flow water turbine has helical blades and may be used in ocean and river current turbines, either horizontally, or at an angle (inclined) to the surface so that the generator and gearbox are above the surface. The blades may be formed from a sheet of material, e.g. in a cardioid shape (see figure 1). The ends of the blades are then attached to hubs to give the required overall shape. The rotor may be fully submerged, or only partially submerged. The rotor may be used in either direction, and may also be used as a wind turbine, pump impeller, marine propeller or mixer.
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