Wind-Tunnel Test of the S814 Thick-Root Airfoil

    Research output: NRELTechnical Report


    The objective of this wind-tunnel test was to verify the predictions of the Eppler Airfoil Design and Analysis Code for a very thick airfoil having a high maximum lift coefficient designed to be largely insensitive to leading edge roughness effects. The 24-percent-thick S814 airfoil was designed with these characteristics to accommodate aerodynamic and structural considerations for the rootregion of a wind-turbine blade. In addition, the airfoil's maximum lift-to-drag ratio was designed to occur at a high lift coefficient. To accomplish the objective, a two-dimensional wind-tunnel test of the S814 thick root airfoil was conducted in January 1994 in the low-turbulence wind tunnel of the Delft University of Technology Low Speed Laboratory.
    Original languageAmerican English
    Number of pages7
    StatePublished - 1995

    NREL Publication Number

    • NREL/TP-442-7388


    • blades
    • Eppler airfoil design and analysis code
    • wind tunnels
    • wind turbines


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