Design and Experimental Results for the S809 Airfoil

    Research output: NRELSubcontract Report


    A 21% thick, laminar-flow airfoil, the S809, for horizontal-axis wind turbine applications, has been designed and analyzed theoretically and verified experimentally in the low-turbulence wind tunnel of Delft University of Technology Low Speed Laboratory, The Netherlands. The two primary objectives of restrained maximum lift, insensitive to roughness, and low profile drag have been achieved. Theairfoil also exhibits a docile stall. Comparisons of the theoretical and experimental results show good agreement. Comparisons with other airfoils illustrate the restrained maximum lift coefficient as well as the lower profile-drag coefficients, thus confirming the achievement of the primary objectives.
    Original languageAmerican English
    Number of pages103
    StatePublished - 1997

    Bibliographical note

    Work performed by Airfoils, Incorporated, State College, Pennsylvania

    NREL Publication Number

    • NREL/SR-440-6918


    • horizontal-axis wind-turbine airfoil


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