AIRFOIL TYPES EFFECT ON GEOMETRY AND PERFORMANCE OF A SMALL-SCALE WIND TURBINE BLADE DESing
Many airfoils could be used to form a wind turbine blade. Different airfoil would result in an altered blade planform and its performance characteristics. Airfoil identification that should be included in the design then becomes an important task. Utilizing Blade Element Momentum Theory computation procedures, eleven types of airfoils were applied in blade geometries of rotors of 2.4 m in diameters. The changes in the distribution of chord lengths, twists, solidity ratio, and Reynolds numbers of the blades were compared as geometry parameters. The designed and off designed powers and thrusts were calculated, and the characteristics of the performance of the rotor were represented by the coefficient of power and coefficient of thrust. The calculated geometries showed that distinct airfoils resulted in different segments sizes of the blades and different performance characteristics of the rotors.The use of an airfoil that has a high lift coefficient and a high glide ratio in the design of a blade will produce a narrow blade and a small solidity ratio. The design will also have a high power coefficient at the tip speed ratio design. However, the blade power coefficient may be sensitive to changes in rotational speed.
The authors acknowledge LPDP, Ministry of Finance of the Republic of Indonesia, for the fund support of the present work (No. PRJ-4863/LPDP.3/2016).
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