Abstract
This paper investigates the unsteady aerodynamic performance due to oscillatory motion. The wind flows velocity is constant across the wind turbine rotor is applied, therefore, the attached flow on a 2-D airfoil and the aerodynamic critical damping of the large-scale horizontal axis wind turbine (LS-HAWT) blade structure are considered. The blade element momentum (BEM) theory is developed to estimate the aerodynamic forces acting on the blade. From this study, it has been observed that the flow conditions on airfoil profile oscillation in plunge motion at some frequency, which is similar to the eigen-frequency for the LS-HAWT blade. Here, the aerodynamic damping for its eigen-modes is estimated. Finally, it found that the wind turbine blade has an oscillatory frequency is close to the blade frequency. However, the computational fluid dynamics (CFD) has relatively too extensive computational time compared to the BEM code and it may computationally speed up the computational process.
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