[01] Jaber Hosseinzadeh Gervi, Department of Mechanical Engineering Babol Noshirvani, University of Technology, Babol, Iran. [02] Mojtaba Aghajani Delavar, Department of Mechanical Engineering Babol Noshirvani, University of Technology, Babol, Iran. [03] Korosh Sedighi, Department of Mechanical Engineering Babol Noshirvani, University of Technology, Babol, Iran.

Generating energy from wind as a renewable energy resource has always been a growing field of study. This article analyzes the aerodynamics of Savonius wind turbine with vertical axis. Blades with multi stacks can give rise to blade efficiency. For this purpose, different models of blades were suggested and the impact of blade intervals on the torque output has been studied. Moreover, the flow of fluid around the turbine rotor has been calculated with the CFD method and the standard k-ε turbulence model is used. The simulations were performed at four different wind velocities of 3, 4, 5, and 6 m/s. The rotor torque is analyzed with different rotor angles from 0 to 360 degrees with 30° pitches. The results clearly show that the torque output increases as the intervals between the blade stacks decrease. Also this paper, for the first time, shows that as the thickness of the outer blade’s slot increases, the torque will decrease.

Savonius Rotor, Computational Fluid Dynamics, Double Stacks Blade, Torque

[01] Sukanta Roy, Ujjwal K. Saha, " Review on the numerical investigations into the design and development of Savonius wind rotors", Renewable and Sustainable Energy Reviews, VOL.24, pp. 73-81, 2013 [02] S.J. Savonius. The S-rotor and its applications. J. Mech. Engg. 53, 333- (1931338). [03] Khandakar Niaz Morshed, Mosfequr Rahman, Gustavo Molina, Mahbub Ahmed. Wind tunnel testing and numerical simulation on aerodynamic performance of a three-bladed Savonius wind turbine. International Journal of Energy and Environmental Engineering. 2013, 4:18 [04] Mohommed Hadi Ali . Experimental Comparison Study for Savonius Wind Turbine of Two & Three Blades At Low Wind Speed. International Journal of Modern Engineering Research (IJMER) .Vol. 3, Issue. 5, Sep - Oct. 2013 pp-2978-2986 [05] M.H. Nasef, W.A.El-Askary, A.A.AbdEL-hamid, H.E.Gad. Evaluation of Savonius rotor performance: Static and dynamic studies. J. Wind Eng.Ind.Aerodyn.123(2013)1–11 [06] Pinku Debnath, Rajat Gupta. Flow Physics Analysis of Three-Bucket Helical Savonius Rotor at 90 ᵒTwist Angle Using CFD. International Journal of Modern Engineering Research (IJMER). Vol.3, Issue.2, March-April. 2013, pp-739-746 [07] Bachu Deb and, Rajat Gupta. Fluid Flow Analysis of Savonius Rotor at Different Rotor Angle Using CFD. ISESCO JOURNAL of Science and Technology, Vol .8 - No2012 ( 35-42) [08] S. McTavish, D. Feszty, T. Sankar. Steady and rotating computational fluid dynamics simulations of a novel vertical axis wind turbine for small-scale power generation. Renewable Energy. 41. (2012). 171-179 [09] M.H. Nasef, W.A. El-Askary, A.A. AbdEL-hamid, H.E. Gad, "Evaluation of Savonius rotor performance:Static and dynamic studies", Journal of Wind Engineering and Industrial Aerodynamics, pp.1-11, 2013 [10] Fluent Inc Products, FLUENT® Ver. 6.3.26