Effect of geometrical parameters on the performance of conventional Savonius VAWT: A review

• Published in: Renewable & sustainable energy reviews 2022-06, Vol.161, p.112314, Article 112314
• Main Authors: Cuevas-Carvajal, N., Cortes-Ramirez, J.S., Norato, Julian A., Hernandez, C., Montoya-Vallejo, M.F.
• Format: Article
• Language: English
• Subjects: Geometric parameters; Renewable energy; Savonius-type wind turbine; Small vertical axis wind turbine
• ISSN: 1364-0321; 1879-0690
• DOI: 10.1016/j.rser.2022.112314

Wind power is one of the main sources of renewable energy. New applications of this technology are currently under development through small vertical axis wind turbines, allowing energy production in small spaces even at low wind speeds. Therefore, creating an effective turbine design methodology tailored to these operating conditions has been the subject of extensive research. The Savonius-type vertical axis wind turbine is one of the most widely used due to its low cost and easy manufacturing. Several works have examined the effect of various geometric parameters on the performance of the Savonius-type wind turbine. However, there are no published overarching conclusions about these works. Thus, this paper aims to review and discuss in a concise way experiments and simulations carried out by several authors evaluating the effect of some geometric parameters on the maximum power and torque coefficient of Savonius vertical axis wind turbines. The paper also discusses additional experiments that should be performed in future work. •The effect of geometrical parameters of Savonius-type vertical axis wind turbine rotor on its efficiency is reviewed.•Power and torque coefficients response to variation of four geometrical parameters are discussed.•Geometrical parameters as aspect ratio, twist angle, overlap ratio, number of blades, and number of stages are explored.•Diverse experimental and numerical researches are explored and maximum power and torque coefficients found are graphically presented as function of each geometrical parameter.