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All Journal Jurnal Media Elektro : Journal of Electrical Power, Informatics, Telecommunication, Electronics, Computer and Control System
Nur Afni
Nusa Cendana University
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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STUDY OF BLADE OVERLAP VARIATION ON THE POWER COEFFICIENT, TORQUE, AND TSR OF A SAVONIUS TURBINE FOR THE LOW-WIND-SPEED REGION OF NTT Nur Afni; Sudirman Syam; Sri Kurniati
Jurnal Media Elektro Vol 15 No 2 (2026): Oktober 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jme.v0i0.30198

Abstract

The utilization of wind energy in East Nusa Tenggara (NTT), which has low wind speeds (2–7 m/s), requires a turbine capable of operating under low-flow conditions. The Savonius turbine is a suitable solution because of its good self-starting capability and simple construction. This study aims to analyze the effect of blade overlap air-gap variations on the performance of a U-type Savonius turbine, including torque, power coefficient (Cp), and tip speed ratio (TSR). An experimental method was conducted using a wind tunnel and blower as an artificial wind source. Three overlap gap variations tested were 5 mm, 10 mm, and 15 mm, with wind speeds ranging from 4 m/s to 12 m/s under mechanical loading. Data collection was repeated three times for each test condition. The results show that the overlap gap variation significantly affects turbine performance. The 5 mm overlap configuration consistently produced the best performance with a maximum torque of 0.0027 N·m at 12 m/s wind speed, the highest power coefficient of 0.046 at 9 m/s, and the highest TSR of 0.190 at 10 m/s. The 5 mm overlap configuration is recommended for application in regions with low to moderate wind speeds (4–8 m/s) such as NTT.
Co-Authors Sri Kurniati Sudirman Syam