Wind turbine comprising elastically flexible rotor blades
a technology of elastic flexible rotor blades and wind turbines, which is applied in the direction of propellers, propulsive elements, water-acting propulsive elements, etc., can solve the problems of significant reduction of resistance coefficient and considerable decrease of the projected wind application surface, and achieve low modulus of elasticity , the effect of high strength
Inactive Publication Date: 2007-05-03
AERODYN ENG GMBH
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Benefits of technology
[0011] It is particularly advantageous to have a fixed attachment of the rotor blade to the hub without any adjustability by means of bearings or joints, so that fault-proneness is minimized.
[0012] As a result of this pronounced deflection there is, firstly, a considerable decrease in the projected wind application surface, and secondly, the resistance coefficient is significantly reduced as a result of the pronounced outward curvature of the blades associated with the flexure or deflection. As a result of these two effects, under extreme wind conditions the wind shear on the entire turbine can be reduced by half compared with those turbines using rigid blades. This economized materials for the load-transferring components, such as the rotor shaft, machine casing, vertical bearing, tower, anchoring and foundation, so that the total turbine production costs are significantly decreased.
[0014] In a preferred embodiment, the profile thickness and profile depth are constant over the entire blade length. This development makes it possible for the at least one rotor blade to be an extruded fiber composite profile. If the fiber composite material is a glass fiber plastic composite, the requirement for high strength and, at the same time, relatively low modulus of elasticity is fulfilled.
Problems solved by technology
As a result of this pronounced deflection there is, firstly, a considerable decrease in the projected wind application surface, and secondly, the resistance coefficient is significantly reduced as a result of the pronounced outward curvature of the blades associated with the flexure or deflection.
Method used
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[0020]FIG. 1 illustrates the wind power turbine with tower 10 and tower anchor 12. The nacelle 14 is mounted so as to rotate about the axis of tower 10. In nacelle 14 is mounted the rotor 16, which rotates on the lee side, i.e. on the side of tower 10 that is remote from the wind. When the rotor 16 is stationary because of limited wind conditions, and with the turbine operating, the blades are not or only slightly deflected. The blades are fitted to the hub with a cone angle, i.e. a tilted arrangement in the wind direction, so that when the turbine is operating the centrifugal forces and wind shear forces are such that there are roughly no bending movements on the blade root. For wind speeds above the cut-out speed, the turbine is decelerated and brought to a standstill.
[0021] As illustrated in FIG. 2, the wind power turbine of FIG. 1 is shown in the decelerated state under extreme wind speeds. As a result of the wind shear, the blades are deflected by more than two thirds of their...
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The invention relates to a wind turbine having a tower, a nacelle that is mounted on the tower and can be rotated about the axis of the tower, and a rotor which is carried by the nacelle on the lee side and having at least one rotor blade. The flexural strength of the at least one rotor blade permitting the elastic flexure of said blade by more than half of its extension and allowing deflection by more than two thirds of its total length.
Description
PRIOR APPLICATIONS [0001] This application is a continuation-in-part of International Application No. PCT / DE2005 / 001547, filed on Sep. 5, 2005, which in turn bases priority on German Application No. 10 2004 045 401.9, filed on Sep. 18, 2004.BACKGROUND OF THE INVENTION [0002] 1. Field of Invention [0003] The invention relates to a wind turbine having a tower, a nacelle mounted on the tower and rotatable about its axis, and a rotor having at least one rotor blade mounted in a rotary manner in the nacelle, and rotating on the lee side relative to the tower. [0004] 2. Description of the Prior Art [0005] Over the last few decades, wind power technology has developed very dynamically, relating only from average size to very large turbines for main parallel operation. However, there have been no advances in the last twenty years in the development of small power systems in the kilowatt range. Therefore, the turbines are still very expensive and have, consequently, not entered the market. W...
Claims
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Login to View More IPC IPC(8): B63H1/06
CPCF03D1/0608F05B2240/2022F05B2240/2213F05B2240/311F05B2280/5001F05B2280/6003F05C2251/02F05C2253/04Y02E10/721Y02E10/726Y02E10/72
Inventor SIEGFRIEDSEN, SONKE
Owner AERODYN ENG GMBH