![]() ![]() The best operating point will be between these two angles. When the angle is slightly less than the maximum lift angle, the blade will reach its maximum lift/drag ratio. But at very high angles of attack, the drag will increase dramatically. If the airfoil shape is good, the lift force is much bigger than the drag. This force is parallel to the wind flow, and also increases with angle of attack. When it comes to generating the maximum lift, there is an optimum angle of attack.Īnother force also exists. At large angles of attack the blade stalls and the lift decreases again. The lift force increases as the blade is turned to present itself at a greater angle to the wind. Lift and Drag Vectors from WE Handbook- 2- Aerodynamics and Loads ![]() The net result is a lift force perpendicular to the direction of flow of the air. The more curved side generates low air pressures while high pressure air pushes on the other side of the airfoil. Wind turbine blades work by generating lift with their shape. Higher velocity leads to a lower pressure between the sheets. The speed of the air is higher between the two pieces of paper than outside the papers.
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