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Vertical-axis wind turbine

A wind turbine, vertical axis technology, applied in wind turbines, wind turbine combinations, wind turbines at right angles to the wind direction, etc., can solve problems such as uneven torque and noise

Inactive Publication Date: 2006-08-30
XCO2 CONISBEE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, the blades cutting through the air at high rotational speeds can lead to unacceptable noise levels due to the large vortices that flow out at the blade tips
Third, VAWTs generate uneven torque from their lifting surfaces as the blades alternate between crossing the wind direction and "gliding"

Method used

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Examples

Experimental program
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Embodiment Construction

[0033] First refer to figure 2 , the present invention provides a VAWT1 having a rotatable shaft 2 substantially aligned along a longitudinal axis 7 . Three blades 10 are mechanically joined to the rotatable shaft 2 by struts 3 , 4 . Each blade 10 is connected to the rotatable shaft 2 by an upper strut 3 connected to an upper hub 5 on the rotatable shaft 2 and a lower strut 4 connected to the lower hub on the rotatable shaft 2 6. The struts 3 , 4 are substantially horizontal and perpendicular to the longitudinal axis 7 .

[0034] Each blade 10 comprises an elongated body 11 twisted about the longitudinal axis 7 into a helical form. Accordingly, the upper strut 3 of each blade 10 is rotationally offset about the rotatable axis 2 relative to the lower strut 4, as figure 2 shown. The helical form of the blades 10 ensures a smooth torque profile of the turbine 1 since a portion of at least one of the three blades 10 always crosses the ambient wind Wa. The smooth torque cur...

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PUM

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Abstract

A vertical axis wind turbine comprising a shaft rotatable about a longitudinal axis and a plurality of substantially rigid blades mechanically coupled to the shaft, each of the plurality of blades comprising an elongate body having an upper and a lower end, wherein the upper end and the lower end of each blade are rotationally off-set from each other about the longitudinal axis such that each blade has a helix like form, the section of the elongate body of each blade, taken perpendicularly to the longitudinal axis, being shaped as an aerofoil having a leading edge and a trailing edge and a camber line defined between the leading edge and the trailing edge, characterized in that the aerofoil is arcuately shaped such that the camber line lies along a line of constant curvature having a finite radius of curvature.

Description

technical field [0001] The present invention relates to vertical axis wind turbines (VAWT), which are generally, but not exclusively, used to generate electricity. Background technique [0002] VAWT has been known for many years. An early example is shown in U.S. 1,835,018 in the name of Darrieus, in which a turbine is provided with three blades rotating about an axis arranged transversely to the driving wind flow. Each blade has a section in the form of an airfoil which generates dynamic lift as air passes over the upper and lower airfoil surfaces. [0003] exist figure 1 A schematic diagram of how a two-bladed VAWT works is shown in . Each blade 10 is configured as an airfoil which is aligned tangentially to the radius of its path of rotation about the shaft 2 . The nominal wind speed is indicated by the arrow Wn, while the instantaneous velocity of the upper blade 10 is indicated by the arrow v. exist figure 1 In the position shown, the blade 10 is moving through th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D3/00F03D3/06F03D9/00F03D11/00
CPCF03D3/065F05B2240/301Y02E10/74F05B2250/25F03D3/062F03D9/25F03D80/00F03D3/061
Inventor 理查德·科克拉纳
Owner XCO2 CONISBEE