Patent ID: 7780411

Claim:
A method for adjusting an angle-of-attack (δ) of blades in a lift-type vertical axis turbine comprising setting the angle of attack (δ) according to the following formula: δ=β−α, wherein δ is the angle of attack; β is an azimuth angle; α is a rotating angle for blades; and δ, β, and α are as listed below: Azi- 10° 20° 30° 40° 50° 60° 70° 80° 90° muth angle β Angle 20° 20° 30° 40° 40° 50° 60° 60° 30° of to to to to to to to to to attack δ 0° 0° 0° 10° 10° 20° 30° 30° 10° Blade −10° 0° 0° 0° 10° 10° 10° 20° 60° rotating to to to to to to to to to angle α 10° 20° 30° 30° 40° 40° 40° 50° 80° Azi- 100° 110° 120° 130° 140° 150° 160° 170° 180° muth angle β Angle 60° 80° 100° 110° 120° 140° 150° 160° 190° of to to to to to to to to to attack δ 30° 50° 70° 80° 100° 120° 130° 140° 170° Blade 40° 30° 20° 20° 20° 10° 10° 10° −10° rotating to to to to to to to to to angle α 70° 60° 50° 50° 40° 30° 30° 30° 10° Azi- 190° 200° 210° 220° 230° 240° 250° 260° 270° muth angle β Angle 190° 200° 220° 240° 250° 270° 280° 280° 290° of to to to to to to to to to attack δ 220° 230° 240° 260° 270° 290° 300° 300° 310° Blade 0° 0° −10° −20° −20° −30° −30° −20° −20° rotating to to to to to to to to to angle α −30° −30° −30° −40° −40° −50° −50° −40° −40° Azi- 280° 290° 300° 310° 320° 330° 340° 350° 360° muth angle β Angle 300° 300° 310° 320° 320° 330° 340° 360° 370° of attack δ 320° 320° 330° 340° 350° 350° 360° 350° 360° Blade −20° −10° −10° −10° 0° 0° 0° −10° −10° rotating to to to to to to to to to angle α −40° −30° −30° −30° −30° −20° −20° 0° 0°.