Design and Power Coefficient Investigation of Small Scale Horizontal Axis Wind Turbine Blade with Three Different Airfoils
DOI:
https://doi.org/10.36602/ijeit.v14i2.611Keywords:
Horizontal Axis Wind Turbine, Small Scale, Airfoils (S821, S819, S820), Blade Design, BEM, Power Coefficient.Abstract
This work is based on the design study of a small-scale horizontal axis wind turbine blade combined with three airfoils using Blade Element Momentum Theory (BEM). In this study, the aerodynamic characteristics of three different airfoils selected and distributed along the blade length were analyzed to obtain optimum design parameters for the wind turbine blade. The BEM theory was implemented for wind turbine blade design and computed the power coefficient. The paper presents the design of a blade that is 6 m in length, which is combined with three airfoil types: S821, S819, and S820, distributed along the blade regions-root, primary, and tip, respectively. In the blade design, techniques were used to linearize the chord length and twist angle for blade optimization. The power coefficient was computed at an angle of attack of 5 degrees through axial and angular induction factors calculations for the blade sections, and the result obtained for the power coefficient is 44.42%. This value does not include the generator efficiency, so this result agrees with the estimated power coefficient for the blade design of 38.25%. This study presents a good power coefficient prediction to motivate continuous research in the wind energy sector.
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