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This paper studies the flow over Savonius wind turbine at the angle of turbine blade of 0°, 30°, 60°, 90°, 120° and 150°. The study was using the commercial Computational Fluid Dynamics (CFD) program, OpenFOAM, and conducted in a 2D domain. The numerical and experimental results were compared for validation at the Reynolds number of 4.32× 105. The propose is to numerically simulate the behavior of airflow though turbine blade including pressure contour and velocity streamline. Moreover, the present study is to show the effect of the Savonius wind turbine with curved guide vanes on the performance. The results show that the turbine with the curved guide vanes has a higher torque coefficient compared to conventional rotors at the 0°, 30°, 60°, 120° and 150° positions except 90°. Those obtained results will be used as parameters to design for improvement the performance of Savonius wind turbine.
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