Abstract
The present wind turbine is a small one which can be used on roofs or in gardens. This turbine has a vertical axis. Each turbine blade combines a rotating movement around its own axis and around the main rotor axis. Due to this combination of movements, flow around this turbine is highly unsteady and needs to be modelled by unsteady calculation. The present work is an extended study starting in 2009. The benefits of combined rotating blades have been shown. The performance coefficient of this kind of turbine is very good for some blade stagger angles. Spectral analysis of unsteady results on specific points in the domain and temporal forces on blades was already presented for elliptic blades. The main aim here is to compare two kinds of blades in case of the best performances.
Highlights
All wind turbines can be classified in two great families ([8]) (i) horizontal-axis wind turbine (HAWTs) and (ii) vertical-axis wind turbine (VAWTs)
A lot of works was published on VAWTs like Savonius or Darrieus rotors ([7], [10]...) but few works were published on VAWTs with relative rotating blades ([1] to [6], [12])
Some inventors discovered this kind of turbine in the same time on different places (Cooper and Dieudonné for example) and made studies these last ten years on this kind of VAWTs
Summary
All wind turbines can be classified in two great families ([8]) (i) horizontal-axis wind turbine (HAWTs) and (ii) vertical-axis wind turbine (VAWTs). In previous studies ([1, 2]) the benefit of rotating elliptic and straight blades was shown: the performance of this kind of turbine was very good and better than those of classical VAWTs for some specific initial blade stagger angles between 0 and 15 degrees. A significant influence of sketch of blades, of blade speed ratios and of initial blade stagger angles (figure 3) was demonstrated.
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