Performance enhancement of twisted-bladed Savonius vertical axis wind turbines

Saad, Ahmed S.; El-Sharkawy, Ibrahim I.; Ookawara, Shinichi; Ahmed, Mahmoud

doi:10.1016/j.enconman.2020.112673

Cited by 99 publications

(46 citation statements)

References 43 publications

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“…Additionally, it can be recognized that the minimum values of static moment coefficients are from 20 • to 80 • and 330 • to 380 • , respectively. With this said, it was found that the optimized design can start by itself since its moment coefficients remain positive while the SWT with a semi-cylindrical shape has negative moment coefficients which hinder its ability to self-start [39]. Therefore, the new SWT has a relatively superior self-starting capability compared to the traditional SWT.…”

Section: Static Condition Analysismentioning

confidence: 99%

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Ubando

San

Cruz

2022

Wind

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Wind energy is an alternative source of clean energy to address the growing energy demand and provide pollution-free electricity. With the rapid development of urban areas, high wind energy resources such as high-rise building rooftops are excellent locations for urban wind turbine installation. One of the practical and simple urban wind turbines is the Savonius design. It has a simple design, easy to maintain, and is very affordable. This work focuses on the design evaluation of a Savonius wind turbine (SWT) by varying the rotor diameter, rotor height, and twist angle for urban applications. A transient computational fluid dynamics (CFD) approach is applied to assess the various design treatments using a space-filling design of experiments. To address the spaces in the hypercube statistical design, a sphere packing design method was adopted which suited the evaluation of computational simulations results such as that of the CFD. The Gaussian stochastic process model was applied to establish the trend of the parametric performance of the optimized SWT design through the model fitting. The results have shown that optimized SWT performs well with its self-starting capability compared to the traditional Savonius design. In addition, the optimized SWT has shown a better peak power coefficient compared with the results of previous works on the design of SWT.

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Section: Static Condition Analysismentioning

confidence: 99%

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Ubando

San

Cruz

2022

Wind

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“…24 This modified configuration achieved an increase in the power coefficient by 11:34%. Saad et al 25 investigates the effect of twist angle, overlapping ratio and end plate size ratio and achieved a power coefficient of 0.232 at wind speed of 6 m/s and 45 deg twist angle and overlapping ratio of zero and endplate size ratio of 1.1. The turbulences models for CFD simulations in wind rotor are extremely important parameters to be consider.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of Savonius wind turbine by blade shape and twisted angle modifications

Elmekawy

Saeed

Kassab

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Three-dimensional CFD simulations are carried out to study the increase of power generated from Savonius vertical axis wind turbines by modifying the blade shape and blade angel of twist. Twisting angle of the classical blade are varied and several proposed novel blade shapes are introduced to enhance the performance of the wind turbine. CFD simulations have been performed using sliding mesh technique of ANSYS software. Four turbulence models; realizable k -[Formula: see text], standard k - [Formula: see text], SST transition and SST k -[Formula: see text] are utilized in the simulations. The blade twisting angle has been modified for the proposed dimensions and wind speed. The introduced novel blade increased the power generated compared to the classical shapes. The two proposed novel blades achieved better power coefficients. One of the proposed models achieved an increase of 31% and the other one achieved 32.2% when compared to the classical rotor shape. The optimum twist angel for the two proposed models achieved 5.66% and 5.69% when compared with zero angle of twist.

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“…Different attempts were made to investigate ways to enhance the power generated by Savonius rotor and consequently improve its performance. This was achieved either by adjusting turbine blade configurations such as twisting rotor blade and/or modifying blade profiles [3][4][5][6][7][8][9][10][11][12], by incorporating fixed shielding plates or deflectors [13][14][15][16][17][18][19][20] in the upstream side of the turbine rotor, by providing wind boosters or curtains to maximize wind strength around the entrance of the wind turbine [21][22][23][24], or by altering the number of rotor blades, blade layers and/or the number of stages (multistacking) [1,[25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Study of a Modified Savonius Rotor Blade by Universal Consideration of Blade Shape Factor Concept

Mahrous

2021

ARFMTS

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This work aims to investigate computationally the performance of Savonius vertical axis wind turbine having a new design feature for its blade geometry. The proposed design is based on a universal consideration of blade shape factor concept for the Savonius rotor blade. A blade shape factor ranges from zero to infinity, or vice versa, is considered in a single blade of the modified Savonius rotor. This means that each point in the two-dimensional blade profile of the suggested blade design has a single value of blade shape factor that is defined based on the dimensions of conventional semi-circular blade. The computational results of the proposed blade shape design, having blade shape factor varying from infinity to zero, showed an improvement in turbine performance as compared to conventional blade shape design. Moreover, increasing the operating range of Savonius wind turbine is expected.

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Performance enhancement of twisted-bladed Savonius vertical axis wind turbines

Cited by 99 publications

References 43 publications

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Performance enhancement of Savonius wind turbine by blade shape and twisted angle modifications

Computational Fluid Dynamics Study of a Modified Savonius Rotor Blade by Universal Consideration of Blade Shape Factor Concept

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