Numerical investigation of conventional and modified Savonius wind turbines

Kacprzak, Konrad; Liśkiewicz, Grzegorz; Sobczak, Krzysztof

doi:10.1016/j.renene.2013.06.009

Cited by 221 publications

(90 citation statements)

References 20 publications

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“…Though two-dimensional simulations fail to consider the three-dimensional effect, previous studies have shown that two-dimensional simulations give acceptable results for Savonius [1,6,14,16,18,19]. Therefore the three-dimensional effects are ignored and two-dimensional transient simulations are carried out to reduce the time cost in this study.…”

Section: Methodsmentioning

confidence: 99%

“…McTavish et al [16] proposed a modified blade shape and carried out both steady and transient CFD simulations. Kamoji et al [17] and Kacprzak et al [18] studied the performance of modified turbines with spline-type and Bach-type blades, with an increase in efficiency 16% found in the case of using spline-type blades. Tian et al [19] carried out CFD simulations of Savonius with elliptical blades.…”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

et al. 2015

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Abstract:The Savonius wind turbine is a type of vertical axis wind turbine (VAWTs) that is simply composed of two or three arc-type blades which can generate power even under poor wind conditions. A modified Savonius wind turbine with novel blade shapes is introduced with the aim of increasing the power coefficient of the turbine. The effect of blade fullness, which is a main shape parameter of the blade, on the power production of a two-bladed Savonius wind turbine is investigated using transient computational fluid dynamics (CFD). Simulations are based on the Reynolds Averaged Navier-Stokes (RANS) equations with a renormalization group turbulent model. This numerical method is validated with existing experimental data and then utilized to quantify the performance of design variants. Results quantify the relationship between blade fullness and turbine performance with a blade fullness of 1 resulting in the highest coefficient of power, 0.2573. This power coefficient is 10.98% higher than a conventional Savonius turbine.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

et al. 2015

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“…Wahyudi et al and Kumar et al [6,7] used obstacle plates or deflectors to optimize the design of Savonius blade turbine. Classical and improved Savonius wind turbines have been studied by Kacprzak et al [8]. The slot position, which affects the starting torque for a Savonius wind turbine, was analyzed by Alaimo et al [9].…”

Section: Introductionmentioning

confidence: 99%

“…Al-Faruk et al suggested power coefficients increase with the increase of blade arc angle up to a certain optimal value of 195 • . Kacprzak et al [8] suggested the optimum blade was composed of a segment of circular arc and a short straight line segment. However, this optimum blade was still built based on a segment of circular arc.…”

Section: Introductionmentioning

confidence: 99%

A Novel Parametric Modeling Method and Optimal Design for Savonius Wind Turbines

et al. 2017

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Abstract:Under the inspiration of polar coordinates, a novel parametric modeling and optimization method for Savonius wind turbines was proposed to obtain the highest power output, in which a quadratic polynomial curve was bent to describe a blade. Only two design parameters are needed for the shape-complicated blade. Therefore, this novel method reduces sampling scale. A series of transient simulations was run to get the optimal performance coefficient (power coefficient C p ) for different modified turbines based on computational fluid dynamics (CFD) method. Then, a global response surface model and a more precise local response surface model were created according to Kriging Method. These models defined the relationship between optimization objective C p and design parameters. Particle swarm optimization (PSO) algorithm was applied to find the optimal design based on these response surface models. Finally, the optimal Savonius blade shaped like a "hook" was obtained. C m (torque coefficient), C p and flow structure were compared for the optimal design and the classical design. The results demonstrate that the optimal Savonius turbine has excellent comprehensive performance. The power coefficient C p is significantly increased from 0.247 to 0.262 (6% higher). The weight of the optimal blade is reduced by 17.9%.

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“…Golecha et al placed a guide vane in front of the turbine to deflect flow for the returning blade [21]. Kacprzak et al studied the performance of modified turbines with spline-type and Bach-type blades, and an increment of 16% in the efficiency was found in the case of using spline-type blades [22]. Tian et al studied the performance of the Savonius turbine with new blades, including elliptical blades [23], and blades derived from the Myring Equation [24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of a VAWT in the Wake of a Moving Car

Tian

Mao

2017

Energies

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Abstract:Wind energy generated from the wake of moving cars has a large energy potential that has not yet been utilized. In this study, a vertical axis wind turbine (VAWT) was used to recover energy from the wakes of moving cars. The turbine was designed to be planted by the side of the car lane and driven by the wake produced by the car. Transient computational fluid dynamics (CFD) simulations were performed to evaluate the performance of the VAWT. The influence of two main factors on the performance of the VAWT, the velocity of the car and the gap between the car and the rotor, were studied. The simulations confirmed the feasibility of this plan, and in the tested cases, the VAWT was able to generate a maximum energy output of 100.49 J from the wake of a car. The results also showed that the performance of the VAWT decreased with the velocity of the car, and the increased gap between the car and the VAWT.

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Numerical investigation of conventional and modified Savonius wind turbines

Cited by 221 publications

References 20 publications

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

A Novel Parametric Modeling Method and Optimal Design for Savonius Wind Turbines

Numerical Simulations of a VAWT in the Wake of a Moving Car

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