In this article, we investigate the influence of the Reynolds number on the flow around a Savonius wind rotor. In particular, we have studied various regimes defined by different Reynolds numbers. Four different Reynolds number, values equal to Re = 98000, Re = 111000, Re = 124000 and Re = 137000 were considered in this study. To do this, we have used an open wind tunnel to evaluate the global characteristics of the wind turbine. The overall performance evaluation of the rotor was focused on the power, the dynamic and the static torque coefficient evolution.