Performance investigation of a small 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:10.1002/er.4874

Cited by 31 publications

(25 citation statements)

References 22 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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“…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

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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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“…In the effort to improve the performance of conventional HAWTs and VAWTs, there have been numerous designs introduced by researchers and inventors which consists of improving the blade design, the generator and even including an additional rotor for maximizing the power output of the turbine which are known today as counter-rotating wind turbines (CRWT) [12][13][14][15][16][17][18][19] . The CRWT is a wind turbine with a coaxial dual-rotor system in which each one of the rotors spins in the opposite direction from the other on a similar rotational axis.…”

Section: Introductionmentioning

confidence: 99%

Technical Feasibility Analysis of Wind Energy Potentials in two sites of East Malaysia: Santubong and Kudat

Rudien¹,

Didane²,

Batcha³

et al. 2021

Evergreen

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This study presents an analysis of wind power potentials for two meteorological stations in the eastern part of Malaysia using the statistical Weibull distribution method over a period of ten years stretching from 2010 to 2019. As the estimation of the resource potentials is crucial towards the planning of a wind energy project, the primary objective of this study is to reveal the characteristics and potentials of the two selected sites. The results show that the highest annual average wind speed was 3.4 m/s at Kudat station and 2.3 m/s at Santubong station. The maximum shape and scale parameters were respectively 1.68 and 2.88 m/s and both appeared at Kudat station. The wind power density ranged between 9.45 W/m 2 and 24.24 W/m 2 . The maximum energy density at Kudat was 207.60 kWh/m 2 /year and 106.01 kWh/m 2 /year at Santubong. The most probable wind speeds and wind carrying maximum energy were predicted at 1.68 m/s and 4.59 m/s and both speeds were observed at Kudat in 2019. The maximum deviation between observed frequencies and Weibull frequency distributions was around 27%. While the wind power at each site differs considerably, both of these two stations fall outside of the category of pacific northwest national laboratory (PNNL) classifications due to their low mean wind speeds. Nevertheless, it can be categorized for a smaller scale of wind power generation at a wind turbine elevation of more than 10 m.

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Performance investigation of a small Savonius‐Darrius counter‐rotating vertical‐axis wind turbine

Cited by 31 publications

References 22 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

Technical Feasibility Analysis of Wind Energy Potentials in two sites of East Malaysia: Santubong and Kudat

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