Study of the influence of the internal recovery on the performance of a Savonius wind rotor

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.