Numerical Investigation of the Savonius Vertical Axis Wind Turbine and Evaluation of the Effect of the Overlap Parameter in Both Horizontal and Vertical Directions on Its Performance
Exploiting wind energy, which is a complex process in urban areas, requires turbines suitable for unfavorable weather conditions, in order to trap the wind from different directions; Savonius turbines are suitable for these conditions. In this paper, the effect of overlap ratios and the position of...
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| Veröffentlicht in: | Symmetry (Basel) 2019-06, Vol.11 (6), p.821 |
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| creator | Ebrahimpour, Mohammad Shafaghat, Rouzbeh Alamian, Rezvan Safdari Shadloo, Mostafa |
| description | Exploiting wind energy, which is a complex process in urban areas, requires turbines suitable for unfavorable weather conditions, in order to trap the wind from different directions; Savonius turbines are suitable for these conditions. In this paper, the effect of overlap ratios and the position of blades on a vertical axis wind turbine is comprehensively investigated and analyzed. For this purpose, two positive and negative overlap situations are first defined along the X-axis and examined at the different tip speed ratios of the blade, while maintaining the size of the external diameter of the rotor, to find the optimum point; then, the same procedure is done along the Y-axis. The finite volume method is used to solve the computational fluid dynamics. Two-dimensional numerical simulations are performed using URANS equations and the sliding mesh method. The turbulence model employed is a realizable K-ε model. According to the values of the dynamic torque and power coefficient, while investigating horizontal and vertical overlaps along the X- and Y-axis, the blades with overlap ratios of HOLR = +0.15 and VOLR = +0.1 show better performances when compared to other corresponding overlaps. Accordingly, the average Cm and Cp improvements are 16% and 7.5%, respectively, compared to the base with a zero overlap ratio. |
| doi_str_mv | 10.3390/sym11060821 |
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In this paper, the effect of overlap ratios and the position of blades on a vertical axis wind turbine is comprehensively investigated and analyzed. For this purpose, two positive and negative overlap situations are first defined along the X-axis and examined at the different tip speed ratios of the blade, while maintaining the size of the external diameter of the rotor, to find the optimum point; then, the same procedure is done along the Y-axis. The finite volume method is used to solve the computational fluid dynamics. Two-dimensional numerical simulations are performed using URANS equations and the sliding mesh method. The turbulence model employed is a realizable K-ε model. According to the values of the dynamic torque and power coefficient, while investigating horizontal and vertical overlaps along the X- and Y-axis, the blades with overlap ratios of HOLR = +0.15 and VOLR = +0.1 show better performances when compared to other corresponding overlaps. Accordingly, the average Cm and Cp improvements are 16% and 7.5%, respectively, compared to the base with a zero overlap ratio.</description><identifier>ISSN: 2073-8994</identifier><identifier>EISSN: 2073-8994</identifier><identifier>DOI: 10.3390/sym11060821</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Alternative energy sources ; Automobiles ; Computational fluid dynamics ; Diameters ; Efficiency ; Energy industry ; Energy resources ; Engineering Sciences ; Finite element method ; Finite volume method ; Fluid flow ; Fluids mechanics ; Investigations ; Mechanics ; Numerical analysis ; Performance evaluation ; Renewable resources ; Simulation ; Tip speed ; Turbine blades ; Turbines ; Turbulence models ; Urban areas ; Velocity ; Vertical axis wind turbines ; Weather ; Wind power</subject><ispartof>Symmetry (Basel), 2019-06, Vol.11 (6), p.821</ispartof><rights>2019 by the authors. Licensee MDPI, Basel, Switzerland. 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| subjects | Alternative energy sources Automobiles Computational fluid dynamics Diameters Efficiency Energy industry Energy resources Engineering Sciences Finite element method Finite volume method Fluid flow Fluids mechanics Investigations Mechanics Numerical analysis Performance evaluation Renewable resources Simulation Tip speed Turbine blades Turbines Turbulence models Urban areas Velocity Vertical axis wind turbines Weather Wind power |
| title | Numerical Investigation of the Savonius Vertical Axis Wind Turbine and Evaluation of the Effect of the Overlap Parameter in Both Horizontal and Vertical Directions on Its Performance |
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