Abstract
The paper presents a method of desingning blade geometry of a horizontal-axis medium-speed windmill using blade element theory and an inversion technique which is simplified by defining a local speed ratio at annular blade elements. This approach eliminates iterative computation, and a unique relationship between the local speed ratio and the inflow angle of resultant fluid velocity is established for optimum power coefficient of any blade element. The theoretical design method and the experimental results obtained in a wind tunnel with windmill models of 1 m diameter having different number of blades, twist angle of blade, angle of incidence, tip speed ratio and blade profiles are presented and discussed. Two simple methods of construction of the windmill blades are described briefly and the performance of these blades is presented.
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