A comparative calculation of the wind turbines capacities on the basis of the L–σ criterion |
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Authors: | Jean-Luc Menet Laurent-Charles Valds Bruno Mnart |
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Affiliation: | Groupe de Recherche Energies et Environnement, Université de Valenciennes et du Hainaut-Cambrésis, Le Mont Houy-F-59313 Valenciennes Cedex 9, France |
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Abstract: | Usually, wind sites are equipped with fast-running Horizontal Axis Wind Turbines of the airscrew type, which has a high efficiency. In this article, the argument is put forward that the choice of a wind turbine must not be based only on high efficiency. We propose a comparative criterion adapted to the comparison of a horizontal axis wind turbine with a vertical axis wind turbine: the L–σ criterion. This criterion consists in comparing wind turbines which intercept the same front width of wind, by allocating them a same reference value of the maximal mechanical stress on the blades or the paddles. On the basis of this criterion, a quantitative comparison points to a clear advantage of the Savonius rotors, because of their lower angular velocity, and provides some elements for the improvement of their rotor. |
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