| 摘要 |
The present invention relates to a blade for a rotor of a wind turbine, which rotor comprises a hub, from which hub at least one blade extends substantially radially, which blade comprises a root area closest to the hub, which blade comprises a transition area away from the hub, which blade further comprises at least a first airfoil. The scope of the invention can be fulfilled by blades comprising at least one longitudinal channel, which channel has an inlet opening in the front of the airfoil, which channel has an outlet opening at the backside of the air foil, which channel opening area is decreasing from the inlet opening to the outlet opening. Hereby, it is achieved that in the channel there is an increasing speed of the air which is flowing through that channel which will lead to increasing the power produced from the wind surrounding the blade.
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