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Experimental investigations are carried out to study the influence of the internal recovery on the performance of a Savonius rotor at different Reynolds number. Four different internal recoveries equal to r pi =0, r pi =0.1, r pi =0.2 and r pi =0.3 are attempted in this study. Results conclude that the internal recovery value has an effect on the presentation of the global characteristics. Particularly, we have observed that the power and the torque coefficients reach the most important values for the internal recovery value equal to r pi =0. With the increase of the internal recovery values, a progressive decrease of the power values is observed at the same specific speed λ.

In this paper, a study of the effect of Reynolds number on the aerodynamic characteristics of a horizontal axis wind turbine equipped by three adjustable blades of the Göttingen 188 airfoil has been developed. Particularly, different aerodynamic regimes defined by Reynolds numbers were investigated. To achieve this, an open wind tunnel has been used to determine the global characteristics of the wind turbine. The obtained results consist of the recovered power, the exerted torque on the rotor in static and in dynamic modes as well as power coefficient and torque coefficient. This work has been developed at Laboratory of Electro-Mechanic Systems (LASEM) of the National School of Engineers of Sfax (ENIS).

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