For the improvement of the performance of drag-type windmills with vertical-axis, the experimental study proposed the windmill system using the wake behind a bluff body. The model windmill has two Savonius rotors that were set in parallel behind the circular cylinder. Through the wind tunnel experiment the revolution of the rotor of the windmill system was compared with that of the single rotor. The revolution of the windmill system was found higher than that of the single rotor. Also the optimal configuration of the Savonius rotors was found. From the experiment for three types of the devices for power augmentation; guide-vane, circular are plate and splitter plate, the power augmentation system was found to decrease the revolution of rotor in all conditions.
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