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Study of the Hydrodynamic Behavior of Horizontal Axis Tidal Turbines Based on the Blade Element Momentum Theory and Numerical Simulations
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DOI: https://doi.org/10.15866/ireme.v12i6.14184
Abstract
The aim of this study is to predict the power output and the power coefficient for various tidal turbine rotors, with four different airfoils, in particular, the Eppler E603, the NACA 653-618, the NREL's S816 and the NREL's S831 airfoils. The first step of the study was the development of a user-friendly application, based on the Blade Element Momentum (BEM) theory, for the calculation of the above-mentioned quantities and the optimum chord and twist distributions of the blade for each case. Parameters such as the airfoil characteristics, the number of blades, the rotor diameter, the tidal current velocity and the tip speed ratio (TSR) were examined. From the results it was obvious that as the tidal current velocity and the rotor diameter increase, the power output increases. Furthermore, the power coefficients for all the examined airfoils were high enough, although the S831 airfoil was found to have the best performance. Because the BEM method can’t predict the three-dimensional phenomena that occur in the real flow, a commercial Computational Fluid Dynamics (CFD) code was used in order to obtain further knowledge of the flow field over the rotor with the S831 airfoil, which was found to have the highest performance.
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