Analysis of Power and Efficiency of a ThreeStage Four-Blade Savonius Wind Turbine with Variations in Load and Wind Speed

Pohan, Gerald Adityo and Sandiawan, Gerardus Dharma and Rahmadianto, Febi and Sutrisno, Tito Arif (2025) Analysis of Power and Efficiency of a ThreeStage Four-Blade Savonius Wind Turbine with Variations in Load and Wind Speed. ENERGY: JURNAL ILMIAH ILMU-ILMU TEKNIK, 15 (2). ISSN 2962-2565

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Abstract

Indonesia's wind potential typically features low wind speeds, ranging from 3 m/s to 7 m/s, making vertical-axis wind turbines particularly suitable for these conditions. Therefore, the concept of developing a device emerged—designing a laboratory-scale Savonius wind turbine utilizing a wind tunnel so that a multi-stage windmill can operate using a 3D printing method. The testing was carried out using the observational method, which involved directly observing the object under study—in this case, a four-blade Savonius wind turbine—to determine the power output at specific wind speeds and loads using a wind tunnel. The experiment used two load variations of 0.01 kg and 0.02 kg, which were intended to simulate mechanical loads at wind speeds of 6 m/s and 7 m/s. At wind speeds of 6 m/s and 7 m/s, the turbine produced shaft rotations of 427 rpm, 259 rpm, 359 rpm, and 305 rpm with loads of 0.01 kg and 0.02 kg. For the four-blade configuration, the wind speeds of 6 m/s and 7 m/s generated turbine power outputs of 10.033 W and 6.318 W with loads of 0.01 kg and 0.02 kg, respectively. At wind speeds of 6 m/s and 7 m/s with loads of 0.01 kg and 0.02 kg, the turbine efficiencies were 0.707%, 0.682%, 1.193%, and 1.611%. For the four-blade configuration at 6 m/s and 7 m/s with loads of 0.01 kg and 0.02 kg, the generator power outputs were 7.08 W, 0 W, 3.29 W, and 0 W, respectively. Based on the test results and data analysis—including wind turbine rotational speed, turbine power, generator power, and turbine efficiency—the findings show a directly proportional relationship. Therefore, the higher the number of blades, the greater the turbine’s rotational speed, turbine power, generator power, and efficiency.

Item Type:	Article
Uncontrolled Keywords:	Savonius Turbine; Turbine Power; Turbine Efficiency
Subjects:	Engineering > Mechanical Engineering
Divisions:	Fakultas Teknologi Industri > Teknik Mesin S1
Depositing User:	adit adit
Date Deposited:	21 Aug 2026 08:02
Last Modified:	21 Aug 2026 08:02
URI:	http://eprints.itn.ac.id/id/eprint/16449

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