Device and method for adjusting angle-of-attack of wind blades in lift-type vertical axis wind turbine
View Patent ↗A device for adjusting an angle-of-attack (δ) of blades in a lift-type vertical axis turbine comprising a vertical rotating axis, a rotatable cantilever support wing fixed on the vertical rotating axis, a wind rotor comprising a plurality of blades mounted on the cantilever support wing, at least one cam disposed along an axial direction of the vertical rotating axis, the axial direction of the cam being parallel to the rotating axis, and for any point in a contour line of the cam, the angle of attack δ being set 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 preset values.
1. 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°.
2. A device for adjusting an angle-of-attack (δ) of blades in a lift-type vertical axis turbine comprising a vertical rotating axis, a rotatable cantilever support wing fixed on said vertical rotating axis, a wind rotor comprising a plurality of blades mounted on said cantilever support wing, at least one cam disposed along an axial direction of said vertical rotating axis, the axial direction of the cam being parallel to the rotating axis, and for any point in a contour line of said cam, the angle of attack δ being set 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:
Azimuth angle β
10°
20°
30°
40°
50°
60°
70°
80°
90°
Angle of attack δ
20° to 0°
20° to 0°
30° to 0°
40° to 10°
40° to 10°
50° to 20°
60° to 30°
60° to 30°
30° to 10°
Blade rotating
−10° to 10°
0° to 20°
0° to 30°
0° to 30°
10° to 40°
10° to 40°
10° to 40°
20° to 50°
60° to 80°
angle α
Azimuth angle β
100°
110°
120°
130°
140°
150°
160°
170°
180°
Angle of attack δ
60° to 30°
80° to 50°
100° to 70°
110° to 80°
120° to 100°
140° to 120°
150° to 130°
160° to 140°
190° to 170°
Blade rotating
40° to 70°
30° to 60°
20° to 50°
20° to 50°
20° to 40°
10° to 30°
10° to 30°
10° to 30°
−10° to 10°
angle α
Azimuth angle β
190°
200°
210°
220°
230°
240°
250°
260°
270°
Angle of attack δ
190° to 220°
200° to 230°
220° to 240°
240° to 260°
250° to 270°
270° to 290°
280° to 300°
280° to 300°
290° to 310°
Blade rotating
0° to −30°
0° to −30°
−10° to −30°
−20° to −40°
−20° to −40°
−30° to −50°
−30° to −50°
−20° to −40°
−20° to −40°
angle α
Azimuth angle β
280°
290°
300°
310°
320°
330°
340°
350°
360°
Angle of attack δ
300° to 320°
300° to 320°
310° to 330°
320° to 340°
320° to 350°
330° to 350°
340° to 360°
360° to 350°
370° to 360°
Blade rotating
−20° to −40°
−10° to −30°
−10° to −30°
−10° to−30°
0° to −30°
0° to −20°
0° to −20°
−10° to 0°
−10° to 0°
angle α
3. The device of claim 2 , wherein the rotating axis of each blade is rotatable horizontally relative to the connected cantilever support wing.
4. The device of claim 2 , wherein an optimum range of the blade rotating angle α is ±60 degrees.