The twisted blade means that the aerodynamic profile and installation angle of the blade are different along the entire length of the blade and gradually decrease from the blade root to the blade tip.
The optimal angle of attack can be achieved anywhere on the blade, to achieve the best lift and higher wind energy reception efficiency.
Since the rotational speed of the blade increases with blade length, the angle toward the wind continually changes as the blade extends.
Therefore, in order to maintain the optimal angle of attack in the upwind area of the blades, the blades of large wind turbines must be designed in a twisted shape.