![]() ![]() Sample calculations for an NACA 63/sub 2/-015 airfoil showed an annual energy output increase of 17 to 27% depending upon rotor solidity, compared to an NACA 0015 airfoil. ![]() Furthermore, the power coefficient-tip speed ratio curves were broader and flatter for the 6-series airfoils. Performance calculations indicated that the NACA 6-series airfoils yield peak power coefficients at least as great as the NACA four-digit airfoils which have historically been chosen more ยป for Darrieus turbines. Ten different airfoils, having thickness to chord ratios of twelve, fifteen and eighteen percent, were investigated. Analysis was limited to machines using two blades of infinite aspect ratio, having rotor solidites from seven to twenty-one percent, and operating at maximum Reynolds numbers of approximately three million. The purpose of this study was to determine what aerodynamic performance improvement, if any, could be achieved by judiciously choosing the airfoil sections for Darrieus wind turbine blades. ![]()
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