Optimum Operational Parameters for Yawed Wind Turbines

Figure 2

Airfoil for one blade element. 𝛼: angle of attack; 𝜙: angle between the relative wind and the plane of rotation; 𝜃: pitch angle; 𝐿: lift force normal to the wind direction; 𝐷: profile drag parallel to the wind direction; 𝑑𝐹₁: thrust force on the blade element normal to the plane of rotation; 𝑑𝐹₂: drag force on the blade element tangential to the circle swept by the rotor; 𝑊: relative wind speed; 𝑊_𝑃: component of 𝑊 normal to the plane of rotation; 𝑊_𝑇: component of 𝑊 tangential to the circle swept by the rotor; 𝑐: chord length; 𝑥: radial location of a blade element.