Simulation Study on the Performance of a Counter-rotating Savonius Vertical Axis Wind Turbine

Didane, Djamal Hissein; Anuar, Muhammad Amir Zafran Saipul; Batcha, Mohd Faizal Mohideen; Abdullah, Kamil; Fawzi, Mas; Mohammed, Akmal Nizam

doi:10.37934/cfdl.12.4.111

Cited by 18 publications

(17 citation statements)

References 16 publications

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“…In the current study, the Transition Shear-Stress Transport TSST (4 equations) turbulence model, variant of SST k- model, with default quantities was used to estimate the turbulent quantities. The SST k- model variants showed their ability to give acceptable results close to experimental data [37][38][39][40][41]. The TSST k- model is primary based on the SST model transport equations but coupled with two additional transport equations, one for intermittency and the other for the momentum thickness Reynolds number.…”

Section: Conservation Of Mass (Continuity Equation)mentioning

confidence: 90%

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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Section: Conservation Of Mass (Continuity Equation)mentioning

confidence: 90%

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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“…Moreover, the vertical axis wind turbines (VAWTs) are known for their vertical axis of rotation from the ground and perpendicular to the direction of the wind. Thanks to this design, the VAWT can rotate from any wind direction without the need to install a yaw mechanism that was generally used in large horizontal axis wind turbine (HAWT) [9,10]. One of the significant advantages of VAWT that pushes this type of turbine above others (HAWT) is the positioning of the VAWT main component where the generator and gearbox can be positioned at ground level.…”

Section: Introductionmentioning

confidence: 99%

2D CFD Simulation Study on the Performance of Various NACA Airfoils

Loutun

Didane

Batcha

et al. 2021

CFDL

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The wind is an energy source that has the properties of a clean, free, and readily available energy source. However, the efficiency of the existing rotors used to harness wind power is still not satisfactory. Thus, in this current study, the development and aerodynamic performance investigation of ten NACA airfoils comprising of five symmetrical and five non-symmetrical airfoils have been analyzed through the computational fluids dynamic (CFD) simulation approach. The main motive of this study was to investigate the aerodynamic performance of NACA airfoils to be used on a vertical axis wind turbine (VAWT), which will assist in further understanding the physics of the interaction between airflow and the wind turbine blades. The simulation was performed using two-dimensional computational models based on an unsteady state K-omega Shear Stress Transport (SST) turbulence model. This study covers a parametric study based on the variations of tip-speed ratios and constant wind velocity. The aerodynamic performances are evaluated in terms of torque, torque coefficient, and also power coefficient. The performance of NACA0018 was found to be the best among the other airfoils with a power coefficient of 0.3. NACA0010 displayed the lowest power coefficient among the other airfoils but had a more extensive operating range compared to the other airfoils. However, for non-symmetrical NACA airfoils, NACA2421 scored the highest power coefficient, followed by NACA4412. It was also found that most of the non-symmetrical NACA airfoils can operate at a higher range of tip-speed ratios compared to the symmetrical NACA airfoils.

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“…The blades of a wind turbine turn at a constant or variable velocity between 13 and 20 revolutions per minute, depending on their technology. The velocity of the rotor varies with the wind's velocity to achieve greater efficiency [7]. This wind turbine extracts the wind energy into the electrical power and supplies it to the industrial and residential areas.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics (CFD) Study on the Effect of the Number of Blades on the Performance of Double-Stage Savonius Rotor

Halmy

Didane

Afolabi

et al. 2021

CFDL

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Wind energy is known as renewable energy with the properties of the free, abundant and readily available source of energy. Wind power has now been seen as an alternative way to generate electricity. However, the existing wind turbines to harness this energy, which is used to transform wind kinetic energy into electricity still suffer low conversion capabilities. This study is therefore set out to evaluate the performance of a double-stage Savonius-type rotor while aiming to examine the effectiveness of this technique in increasing the efficiency while overcoming the inherent low inefficiency of the Savonius rotor. The simulations involved the use of the K-omega SST as the turbulent viscosity model. Three simulation models based on a different number of blades on the double-stage model are tested in terms of torque, power, torque coefficient and power coefficient. It is concluded that the double-stage technique was capable of enhancing the performance of the Savonius rotor. It was observed that more blades on a double-stage rotor have a negative effect on the performance of the Savonius rotor in terms of both torque efficiency and power efficiency. Comparing the three models, it was found that the two-blade model of the double-stage produced more torque and power output compared to the other three-blade and four-blade models of the double-stage Savonius rotor. Furthermore, the highest conversion efficiency in terms of power among all models occurs at the TSR of 0.6 with a corresponding maximum power coefficient of 18.4%.

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Simulation Study on the Performance of a Counter-rotating Savonius Vertical Axis Wind Turbine

Cited by 18 publications

References 16 publications

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

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

2D CFD Simulation Study on the Performance of Various NACA Airfoils

Computational Fluid Dynamics (CFD) Study on the Effect of the Number of Blades on the Performance of Double-Stage Savonius Rotor

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