Abstract
Separating region of a flow over Savonius-rotor blades with and without rotation are studied by smoke-wire visualization combined with smoke injection technique and by calculating the separation points with the measured wall-pressure distributions. Both of the results are in agreement and indicate a large reduction of the separating region in the rotating rotor in comparison with the still one. This phenomenon can be explained by the moving wall effect of the rotor blades and by the low-pressure effect produced by central circulation.
