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01.12.2014 | Original Research | Ausgabe 4/2014 Open Access

International Journal of Energy and Environmental Engineering 4/2014

Design of a vertical-axis wind turbine: how the aspect ratio affects the turbine’s performance

Zeitschrift:
International Journal of Energy and Environmental Engineering > Ausgabe 4/2014
Autoren:
S. Brusca, R. Lanzafame, M. Messina

Abstract

This work analyses the link between the aspect ratio of a vertical-axis straight-bladed (H-Rotor) wind turbine and its performance (power coefficient). The aspect ratio of this particular wind turbine is defined as the ratio between blade length and rotor radius. Since the aspect ratio variations of a vertical-axis wind turbine cause Reynolds number variations, any changes in the power coefficient can also be studied to derive how aspect ratio variations affect turbine performance. Using a calculation code based on the Multiple Stream Tube Model, symmetrical straight-bladed wind turbine performance was evaluated as aspect ratio varied. This numerical analysis highlighted how turbine performance is strongly influenced by the Reynolds number of the rotor blade. From a geometrical point of view, as aspect ratio falls, the Reynolds number rises which improves wind turbine performance.
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