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An upper size of vertical axis wind turbines

Authors

  • F. Ottermo,

    Corresponding author
    1. Division for Electricity, Department of Engineering Sciences, Uppsala University, SE-751 21 Uppsala, Sweden
    2. School of Business and Engineering, Halmstad University
    • Correspondence: F. Ottermo, Division for Electricity, Department of Engineering Sciences, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden.

      E-mail: fredric.ottermo@hh.se

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  • H. Bernhoff

    1. Division for Electricity, Department of Engineering Sciences, Uppsala University, SE-751 21 Uppsala, Sweden
    2. Swedish Centre for Renewable Electric Energy Conversion
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ABSTRACT

The scaling behaviour of a straight-bladed vertical axis wind turbine is considered. A scaling scheme is described that, in the presence of a wind shear profile, aims at leaving the material stresses of the scaled construction unchanged. On the basis of a recent 200 kW three-bladed H-rotor design, a structural upper size of the turbine is proposed, this size being the scale at which the gravitational force starts to become important. As gravity has a much worse scaling behaviour than the aerodynamic and centrifugal forces, the construction work will become increasingly more difficult above this scale. The upper size is estimated to be around 30 MW. Copyright © 2013 John Wiley & Sons, Ltd.

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