Experimental Study on the Performance of a Savonius-Darrius Counter-Rotating Vertical Axis Wind Turbine

Didane, Djamal Hissein; Maksud, Siti Masyafikah; Zulkafli, Mohd Fadhli; Rosly, Nurhayati; Shamsudin, Syariful Syafiq; Khalid, Amir

doi:10.1088/1755-1315/268/1/012060

Cited by 15 publications

(15 citation statements)

References 10 publications

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“…Nevertheless, researchers have shown interest in wind energy that new alternative turbine technologies are being researched especially vertical axis wind turbines (VAWT) for building augmented (roof installation) for the urban environment. Vertical-axis wind turbines are known for their insensitivity to yaw angle, very low noise due to low tip speed ratios, and their mechanical and electrical heavy parts are ground positioned [6][7][8].…”

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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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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“…Wind energy is one of the potentials used. It is a type of solar energy that its harnessing does not pollute the environment as much as fossil fuels, coal and nuclear power plants [4,5]. It is abundant, renewable, widely distributed, clean, and produces no greenhouse gas emissions during operation as an alternative to fossil fuels.…”

Section: Introductionmentioning

confidence: 99%

“…As the number of blades increases, changes in a Savonius rotor's dynamics and static moment decrease along with the advancing bucket's angular positions. As both designs of VAWTs suffers from inherent low inefficiencies, many efforts have been exerted over the years to enhance their performances [18,19]. Among the renowned technique is the dual-stage design of the wind turbine which can be applied to overcome this inefficiency while working efficiently under low wind speed conditions [20].…”

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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“…On the other hand, the other type of operating mechanism of a wind turbine is the concept of counter-rotating wind turbine (CRWT). It is found in both HAWT and VAWT, although it has just been introduced to VAWTs recently [13][14][15][16]. It is a system of dual rotors which rotate in opposite directions to one another.…”

Section: Introductionmentioning

confidence: 99%

“…In the last few years, the investigation of the CRWT has been thoroughly approached both numerically and experimentally. It was indicated that the performance of a single-rotor wind turbine (SRWT) had improved significantly with the efficiency of about 43% and 40% in terms of torque and power, respectively [13][14][15]. However, the only drawback was that the system was not able to operate at wind speeds below 5 m/s.…”

Section: Introductionmentioning

confidence: 99%

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

Didane¹,

Anuar²,

Batcha³

et al. 2020

CFDL

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Wind power is an energy source that is becoming an alternative to burning fossil fuels that may harm the environment during operations due to the emission of harmful gases. In this study, simulation and performance investigations of a counter-rotating vertical axis wind turbine (VAWT) based on the Savonius S-type rotor have been analysed through a computational simulation approach. The foremost motive of this study is to widen the operating wind speed range of the counter-rotating concept in a VAWT while enhancing the conversion efficiency of a single-rotor VAWT system. The 3D simulations were performed based on the K-omega shear stress transport (SST) turbulence model. The results have shown that the counter-rotating model possesses better performance characteristics in terms of torque, power and their corresponding coefficients compared to a single-rotor design of a wind turbine. A maximum output of more than two times was obtained from the new CRWT system compared to that of a single-rotor wind turbine (SRWT). Moreover, the output of the top rotor was higher than the bottom rotor due to the increased higher rotational speed of the top rotor.

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Experimental Study on the Performance of a Savonius-Darrius Counter-Rotating Vertical Axis Wind Turbine

Cited by 15 publications

References 10 publications

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

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

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

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