Wind turbines usually operate with their axes directed along the wind or at right angles to it. In both the cases, the blade profile is always parallel to the wind direction. If the turbines are with axes inclined to the wind direction of other than zero or 90 degrees, efficiency will be lower. Employing horizontal axis turbines, with two or more blades or propellers we can minimize stresses impressed on supporting structures. Latest blades and propellers have a twist which is given to them which varies from hub to tip. V.Daniel Hunt, Director of the energy institute, made a classification of wind turbines based on their function. The categories included in Wind energy conversion systems (WECS) are Water-pumping wind mills and electricity producing WECS.
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