Analisis Pengaruh Variasi Overlap Ratio dan Kecepatan Angin Terhadap Koefisien Daya pada Turbin Angin Savonius Menggunakan Metode Computational Fluid Dynamics

Sadrina, Amajida (2025) Analisis Pengaruh Variasi Overlap Ratio dan Kecepatan Angin Terhadap Koefisien Daya pada Turbin Angin Savonius Menggunakan Metode Computational Fluid Dynamics. Undergraduate thesis, UPN "Veteran" Jawa Timur.

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Abstract

The Savonius wind turbine is a type of Vertical Axis Wind Turbine (VAWT) suitable for development in Indonesia due to its capability to operate at low wind speeds. However, its relatively low efficiency remains a challenge. This study aims to analyze the effect of overlap ratio variations and wind speed on the aerodynamic performance of the Savonius wind turbine, focusing on achieving the maximum Power Coefficient (Cp). The method employed is Computational Fluid Dynamics (CFD) using SolidWorks 2024 software on a Modified Bach type Savonius turbine with two blades and an arc angle of 110º. The tested parameters included six overlap ratio values (0.15, 0.2, 0.25, 0.4, 0.5, and 0.6) and wind speeds (2 m/s, 3 m/s, and 4 m/s). The analysis covered turbine power, Cp values, airflow patterns, and pressure distribution. The results indicate that an overlap ratio of 0.2 consistently yielded the highest Power Coefficient (Cp) across all tested wind speeds. The highest maximum Cp was achieved at an overlap ratio of 0.2 and a wind speed of 2 m/s, reaching 0.74 with an efficiency of 74%. The airflow pattern at an overlap ratio of 0.2 demonstrated optimal conditions, where the overlap gap allowed a portion of the airflow to pass to the returning blade, thereby reducing negative torque and maximizing the pressure difference driving rotation. Conversely, increasing the overlap ratio above 0.2 caused a significant decrease in Cp due to flow short-circuits and the formation of large vortices, which increased wake losses.

Item Type:

Thesis (Undergraduate)

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