Today, the most common design of wind turbine, and the type which is the primary focus of this book, is the horizontal axis wind turbine (HAWT). That is, the axis of rotation is parallel to the ground. HAWT rotors are usually classified according to the rotor orientation (upwind or downwind of the tower), hub design (rigid or teetering), rotor control (pitch vs. stall), number of blades (usually two or three blades), and how they are aligned with the wind (free yaw or active yaw). Figure shows the upwind and downwind configurations.


Source: James. F. Manwell, J. G. McGowan, A. L. Rogers. “Wind Energy Explained: Theory, Design and Application”. John Wiley and Sons Ltd., 2009.

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