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Comparison of Aerodynamic Loads for Horizontal Axis Wind Turbine (II): with and without Vertical Wind Shear Effect
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 Title & Authors
Comparison of Aerodynamic Loads for Horizontal Axis Wind Turbine (II): with and without Vertical Wind Shear Effect
Kim, Jin; Kang, Seung-Hee; Ryu, Ki-Wahn;
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The large scale wind turbine blades usually experience periodic change of inflow speed due to blade rotation inside the ground shear flow region. Because of the vertical wind shear, the inflow velocity in the boundary layer region is maximum at uppermost position and minimum at lowermost position. These spatial distribution of wind speeds can lead to the periodic oscillation of the 6-component loads at hub and low speed shaft of the wind turbine rotor. In this study we compare the aerodynamic loads between two inflow conditions, i.e, uniform flow (no vertical wind shear effect) and normal wind profile. From the computed results all of the relative errors for oscillating amplitudes increased due to the ground shear flow effect. Especially bending moment and thrust at hub, and bending moments at LSS increased enormously. It turns out that the aerodynamic analysis including the ground shear flow effect must be considered for fatigue analysis.
Horizontal Axis Wind Turbine;Uniform Flow;Normal Wind Profile;Low-Speed Shaft(LSS);
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