Wind turbine blade with device for changing the aerodynamic surface or shape

摘要

The invention relates to a wind turbine blade comprising a device for modifying the aerodynamic surface or shape of the blade in an area of the trailing edge, and activation mechanisms for controlling the position and/or movement of the device. The device is at least partly divided into a number of sections by interstices or connecting portions having a higher elasticity. Hereby the overall longitudinal bending flexibility of the device is increased which in turn increases the operability of the aerodynamic device and reduces the wear of the system. The interstices may be open, comprise a filler material, or optionally be covered by an elastic film.

主权项

1. A wind turbine blade comprising:
a blade body extending in a longitudinal direction from a root portion to a tip portion and defining an aerodynamic airfoil cross section extending in a chordwise direction transverse to the longitudinal direction, one or more devices for modifying the aerodynamic surface or shape of the blade in an area of a portion of the trailing edge of the blade, and one or more activation mechanisms for controlling the position and/or movement of said device; said device being movably connected to the blade body and being at least partly divided into a number of sections by interstices or connecting portions having higher elasticity than said sections, the interstices or connecting portions extending at least partly through a thickness of the device from a trailing edge of said device and in said chordwise direction, such that the overall longitudinal bending flexibility of the device is increased, wherein the blade body has a trailing edge and the device is attached to the trailing edge of the blade body, said device being a trailing edge flap and a trailing edge of the flap forms at least part of the trailing edge of the wind turbine blade, wherein said trailing edge flap comprises a pressure skin and a suction skin and the interstices or connecting portions extend through a thickness of the flap between the pressure skin and the suction skin, and wherein a first one of the pressure and suction skins is secured to or integral with the blade body, and a second one of the pressure and suction skins is slidably movable with respect to the blade body.