Abstract
The blade airfoil significantly influences the performance of wind turbine. This study designs a new hybrid blade airfoil (abbreviated as HBA) based on the previous airfoils (S809 and NACA 63215). The surface-flow modes, wake-flow characteristics, and aerodynamic performance of HBA were tested using various Reynolds numbers and angles of attack. The experimental methods involved (1) the smoke-wire visualization at low wind speeds, (2) the surface-oil flow visualization at high wind speeds, (3) the hot-wire anemometry, and (4) the six force–moment balancer. At blade stall, the lift coefficient of 2.12 for HBA is approximately twice that of 1.07 for S809 and NACA63215. The maximum lift–drag ratio of 6.11 for HBA is approximately twice those (3.63 and 3.13) of S809 and NACA 63215. Moreover, the HBA has a higher stall angle than those of the other two blades. The (pitch) moment coefficient of HBA is also higher than those of S809 and NACA 63215.
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