sing Laser Doppler Velocimetry to Study the Effect of Aerodynamic Factors for Horizontal Axis Wind Turbine Blade in Spanwise Direction
Keywords:
Horizontal axis wind turbine, Angle of attack, Circulation, AerodynamicAbstract
This research aimed to study aerodynamic factors for wind turbine blade in spanwise direction. This research focused on the angle of attack and circulation on the horizontal axis of the wind turbine (HAWT) near the blade surface during rotating condition. The horizontal axle wind turbine has a rotor diameter of 2.4 meters with 3 blades. Each blade comprises four airfoils (DU91-W2-250, DU93-W-210, NACA63-618, and NACA63-215). Detail measurements of velocity on the blade surface were measured in a wind tunnel by Laser Doppler Velocimetry (LDV). The detail measurements of velocity can be used to find the angle of attack and the circulation on the wind turbine blade surface. The results showed that the low tip speed ratio has a high angle of attack more than the optimum tip speed ratio. When comparing with BEM theory, the results show agreement from midspan to outboard, but the inboard is noticeably different. It corresponds to complicated flow at the inboard which BEM theory cannot be the calculation. The circulation increases when approaching outboard, but the circulation decreases rapidly at the tip of the blade. It corresponds to the effect of tip vortex.
References
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