科研之友
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摘要
Taking wind turbine airfoil DU93-W-210 as the research object, a wind tunnel experiment was carried out to investigate the influence of sweep angle on aerodynamic characteristics of the airfoil. Experimental results reveal that the aerodynamic characteristics of the swept-back airfoil differ significantly in spanwise direction. With the increase of the angle of attack, the swept-back airfoil models undergo three stages of uniform attached flow, mixed separated flow and fully separated flow. Additionally, the slope of the CL curve reduces and the CLmax of the upstream section rises with the increase of the sweep angle. Meanwhile, the sweep has a delay effect on light stall, but causes full stall to occur in advance. Moreover, a swept correction model based on decomposing the inflow velocity in the uniform attached flow region is proposed and validated by the experimental measurements. The correction model can provide a reference for the aerodynamic design of the swept-back blade.
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