Abstract
To improve Savonius rotor performance, flow suction from the upper end plate by the flow over rotor is suggested. Increase in power coefficient by the end plate hole has already been confirmed. This paper deals with the influence of the hole by measuring the pressure distribution on the bucket surface and flow visualization in the rotor with stationary Svonius rotor. Stagnation area near the rotation axis was sucked out in the advancing bucket and also the flow over the rotor flowed into the rotor at the returning bucket were observed. Finally, rotation speed promotion system was confirmed.
