New Airfoils for Small Horizontal Axis Wind Turbines

Department of Aeronautical and Astronautical Engineering. University of Illinois at Urbana-Champaign. 306 Talbot Laboratory. 104 S. Wright Street. Urbana. IL 61801-2935 In a continuing effort to enhance the performance of small wind energy systems, one root airfoil and three primary airfoils were specifically designed for small horizontal axis wind turbines. These airfoils are intended primarily for 1-5 kW variable-speed wind turbines for both conventional (tapered/twisted) or pultruded blades. The four airfoils were wind-tunnel tested at Reynolds numbers between 100,000 and 500,?0~. Tests with simulated leading-edge roughness were also conducted. The results zndlcate that small variable-speed wind turbines should benefit from the use of the new airfoils which provide enhanced lift-to-drag ratio performance as compared with previously existing airfoils.