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Title: Vertical axis wind turbine airfoil

Abstract

A vertical axis wind turbine airfoil is described. The wind turbine airfoil can include a leading edge, a trailing edge, an upper curved surface, a lower curved surface, and a centerline running between the upper surface and the lower surface and from the leading edge to the trailing edge. The airfoil can be configured so that the distance between the centerline and the upper surface is the same as the distance between the centerline and the lower surface at all points along the length of the airfoil. A plurality of such airfoils can be included in a vertical axis wind turbine. These airfoils can be vertically disposed and can rotate about a vertical axis.

Inventors:
; ; ; ;
Publication Date:
Research Org.:
The Regents of the University of California (Oakland, CA)
Sponsoring Org.:
USDOE
OSTI Identifier:
1082348
Patent Number(s):
8,333,564
Application Number:
13/042,390
Assignee:
The Regents of the University of California (Oakland, CA) OSTI
DOE Contract Number:
AC02-05CH11231
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 42 ENGINEERING

Citation Formats

Krivcov, Vladimir, Krivospitski, Vladimir, Maksimov, Vasili, Halstead, Richard, and Grahov, Jurij Vasiljevich. Vertical axis wind turbine airfoil. United States: N. p., 2012. Web.
Krivcov, Vladimir, Krivospitski, Vladimir, Maksimov, Vasili, Halstead, Richard, & Grahov, Jurij Vasiljevich. Vertical axis wind turbine airfoil. United States.
Krivcov, Vladimir, Krivospitski, Vladimir, Maksimov, Vasili, Halstead, Richard, and Grahov, Jurij Vasiljevich. Tue . "Vertical axis wind turbine airfoil". United States. doi:. https://www.osti.gov/servlets/purl/1082348.
@article{osti_1082348,
title = {Vertical axis wind turbine airfoil},
author = {Krivcov, Vladimir and Krivospitski, Vladimir and Maksimov, Vasili and Halstead, Richard and Grahov, Jurij Vasiljevich},
abstractNote = {A vertical axis wind turbine airfoil is described. The wind turbine airfoil can include a leading edge, a trailing edge, an upper curved surface, a lower curved surface, and a centerline running between the upper surface and the lower surface and from the leading edge to the trailing edge. The airfoil can be configured so that the distance between the centerline and the upper surface is the same as the distance between the centerline and the lower surface at all points along the length of the airfoil. A plurality of such airfoils can be included in a vertical axis wind turbine. These airfoils can be vertically disposed and can rotate about a vertical axis.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 18 00:00:00 EST 2012},
month = {Tue Dec 18 00:00:00 EST 2012}
}

Patent:

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  • A wind turbine is disclosed comprising blade forms mounted for limited pivotal movement as they proceed around an orbital path. A torque sensitive control means is provided to progressively limit the pivotal movement of the blade forms in response to changes in the rotational speed of the turbine so that high torque and efficiency is obtained throughout the operational range of the turbine.
  • An overspeed spoiler is described for vertical axis wind turbines of the type having straight or curved airfoil blades attached to a vertical shaft formed by a relatively thin flat blade shaped spoiler element hinge mounted on the trailing edge, leading edge, or at a central position of a portion of the airfoil section. The element has two portions one of which is held flush or against a surface by spring means with a surface of the blade towards the turbine rotor axis and the other lies substantially parallel to the chordline of the airfoil. The weight and configuration ofmore » the element is such that at a predetermined turbine rotor speed the element rotates against the spring force because of centrifugal action and takes up a position generally transverse to the air flow direction such as to cause much increased drag and control overspeeding of the rotor.« less
  • An improved type of wind turbine comprises a rotating assembly attached to a central hub, which is supported for rotation in a horizontal plane about a vertical axis, in a bearing on top of a tower of selected elevation. The rotating assembly comprises at least two radial spokes or arms positioned from each other at equal angles in a horizontal plane. The outer ends of the arms are attached to a connector assembly which generally is in the form of a u-shaped member lying in a vertical plane. A long thin vertically oriented airfoil is mounted on the ends ofmore » each connector, the plane of the chord of the airfoil is perpendicular to the axis of the arm which supports it. A torque shaft is attached at the axis of the hub and passes axially downwardly through the tower to an energy conversion device mounted in a housing on the base, which supports the tower. The tower may be guyed by means of cables, etc. Which are attached below the level of the rotating assembly. Means are provided for using wind power to bring the rotating assembly up to a selected operating speed. Braking vanes are provided to limit the top speed of rotation of the assembly.« less
  • Wind power turbines are largely divided into vertical axis type wind power turbines and propeller type (horizontal axis type) wind power turbines. The present invention discloses a vertical axis type wind power turbine. The airfoil of blades in this vertical axis type wind power turbine is formed in such manner that, denoting a proper position on the airfoil chord line as a camber reversing position, a camber having a downward convex curvature is given between said position and a leading edge and a camber having an upward convex curvature is given between said position and a trailing edge so asmore » to be a mean line and a rational thickness distribution is given to this mean line. This vertical axis type wind power turbine is formed by keeping the spanwise direction of the above mentioned blade parallel with a vertical rotary axis and fitting a plurality of blades at regular intervals at a distance to the vertical rotary axis through respective supporting arms.« less
  • A vertical axis wind turbine is provided based on the co-pending application ser. No. 890,998, filed Mar. 28, 1978, now U.S. Pat. No. 4,204,805. In this improved system the centrifugal forces of rotation produce no bending moments in the air foil spars. Also, the center of mass, the center of useful aerodynamic pressure and the center of main bearing supported are located at the same point to the support structure.