The 12-m Wind Turbine Blade Manufactured by Vølund A/S and O.L. Boats, Denmark

H. Petersen

    Research output: Contribution to journalJournal articleResearchpeer-review


    A 12 m long glass fiber blade has been developed for use as outer wing panels in the two Danish Nibe windmills. The outer wing is composed of a glass-fiber-reinforced plastic, in the form of a NACA 4412 section at the tip and a NACA 4420 section at the root and with chord and section thickness varying linearly along the wing. In bending tests of a 4-m portion of the blade, a compression stress of 137.5 MN/sq m was found to cause failure, and a flapwise bending moment was calculated. Natural frequencies of combined flapwise and chordwise bending have been calculated for the blade fixed at the root face and 1 m from the root face and have been verified experimentally. Aerodynamic calculations have also been performed of the power coefficient as a function of tip speed ratio for various tip chord angles for blades used in a 3-bladed and a 2-bladed rotor configuration with a diameter of 26 m.
    Original languageEnglish
    JournalWind Engineering
    Issue number3
    Pages (from-to)142-154
    Publication statusPublished - 1980

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