Experimental Study on Improvement The Performance of Savonius Windmill with Ventilated Blade

rudi hariyanto, Sudjito Soeparman, Denny Widhiyanuriyawan, Mega Nur Sasongko


This study aims to determine how much influence the use of fixed ventilation on the blade towards improvements in performance Savonius windmill. Ventilation is made in the form of a reflection on the letter C. The ventilation open into the concave side of the blade. There are one model of the conventional Savonius windmill and six models of the ventilated Savonius windmill that tested in the wind tunnels. Experimental variables are variations in the clearence width of the ventilation, variations in wind speed and variations in rotor rotation. Further more, rotor Savonius turn mini-dynamo (magneto) to get current and voltage. The ventilated Savonius windmill have the average useful power and the power coefficient higher than the conventional Savonius windmill. Especially for the clearance width of ventilation is 0.05 to 0.10 of the diameter of the blade.

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