Patent ID: 9657714
Date: 2017-05-23
CPC Classifications: F01D,F03D,F04D,F05B,Y02E,Y10T

Claim:
1. A wind turbine rotor having a blade or blades configured to rotate about an axis of rotation, wherein when considered in a plane normal to the axis of rotation and passing through the blade or each of the blades, the blade or each blade has a respective section bounded by a profile defining an airfoil, the blade or blades consisting of a number N of blades wherein N≧ 1 ; the profile being symmetrical about a chord being a first straight line of length C between first and second points defining respectively a leading edge and a trailing edge of the profile; the respective section having a maximum thickness T transverse to the chord between opposite maximum thickness points P the rotor having a radius of length R in the plane of the profile between the axis of rotation and the center point P the profile having an angle of attack defined as an angle between the chord and a third straight line normal to the radius and passing through the center point P and wherein a fourth straight line normal to the chord and passing through the leading edge intersects a fifth straight line parallel with the chord and passing through a respective one of the maximum thickness points P a sixth straight line between the center point P and a seventh straight line between the leading edge and the respective one of the maximum thickness points P the profile having, between the leading edge and each maximum thickness point P wherein the section defines on each side of the chord a concavity between the respective maximum thickness point P the profile has a trailing edge angle A of between 0° and 5° between the chord and a tangent of a respective one of the concavely curved portions of the profile at its rearward extremity; the center point P the leading edge curvature ratio D and the profile has a ratio of maximum thickness to chord length T/C=0.16 plus or minus an optional thickness deviation, wherein the thickness deviation is from −0.04 to +0.03.