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All Journal JMES: The International Journal of Mechanical Engineering and Sciences
Dhia Fairuz Shabrina
Institut Teknologi Sepuluh Nopember
Energy Materials Science & Nanotechnology Mechanical Engineering

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Performance of a Savonius Turbine with Circular Cylinders Installed in Front of the Convex Blade and Next to the Concave Blade Dhia Fairuz Shabrina; Tri Yogi Yuwono
JMES: The International Journal of Mechanical Engineering and Sciences Vol 9 No 1 (2025)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v9i1.21959

Abstract

Energy demand is found to be increasing alongside population growth. With fossil energy resources depleting, the necessity for utilizing renewable energy sources, such as wind energy, is recognized. The Savonius wind turbine, characterized by simple construction and the ability to operate at low angular speeds, is noted for its poor efficiency. Circular cylinders were installed to evaluate their impact on turbine performance. Experiments were conducted using two configurations. In the first configuration, a circular cylinder was placed beside the concave blade. In the second configuration, circular cylinders were installed next to the concave blade and in front of the convex blade. Circular cylinders with a diameter of 0.5 times that of the turbine blade were utilized. Wind speeds were varied at 4, 5, 6, and 7 m/s. The coefficients of moment, power, and static torque were obtained. Analysis indicated that the addition of the cylinders in both configurations did not significantly enhance the coefficients of power and moment, but did improve the turbine's ability to self-start. For the turbine with the circular cylinder installed, increasing wind speed resulted in decreasing relative performance compared to the conventional turbine.
Analysis of Pressure Distribution and Flow Patterns in Francis Turbine Runners Resulting from Reverse Engineering Using CFD Mohammad Rizanto Juliarsyah; Irwanda Yuni Pungkiarto; Khoirul Anwar; Faradilla Fauziyah Risnawati; Dhia Fairuz Shabrina
JMES: The International Journal of Mechanical Engineering and Sciences Vol 10 No 2 (2026)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v10i2.10252

Abstract

The study tests how well a Francis turbine runner performs under hydraulic conditions by using reverse engineering methods together with steady-state computational fluid dynamics (CFD) testing. Researchers used 3D scanning to create runner geometry, which they turned into a digital model that they used for conducting numerical analysis. Six guide vane openings were tested using three different operating heads set at 60m, 100m, and 136m. The analysis studied different performance curves, hill-chart characteristics, pressure distribution patterns, and streamline flow patterns. The results showed that discharge and shaft power increased with guide vane opening for all operating heads, while efficiency increased only up to the best efficiency point and then decreased at larger openings. The tests showed that different guide vane openings produced different results because each head operated at its own peak efficiency zone. The hill chart identified a high-efficiency zone, while pressure contours and streamlines showed that medium guide vane openings produced more favorable flow behavior than larger openings. The plant data validation confirmed that the predicted power of 1076 kW matched the reference value of 1050 kW, which resulted in a 2.48% error.
Co-Authors Faradilla Fauziyah Risnawati Juliarsyah, Mohammad Rizanto Khoirul Anwar Tri Yogi Yuwono Yuni Pungkiarto, Irwanda