The effect of inner blade position on the performance of the Savonius rotor

Al-Ghriybah, Mohanad; Zulkafli, Mohd Fadhli; Didane, Djamal Hissein; Mohd, Saidatulakmal

doi:10.1016/j.seta.2019.100534

Cited by 26 publications

(19 citation statements)

References 36 publications

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“…ANSYS Fluent is utilized in order to solve these equations with a second-order numerical model. The K-ε/realizable turbulence model was adopted depending on the previous studies in the same area [24].…”

Section: Methodsmentioning

confidence: 99%

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Performance of the Savonius Wind Rotor with Two Inner Blades at Low Tip Speed Ratio

Al-Ghriybah¹,

Zulkafli²,

Didane³

et al. 2020

CFDL

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The Savonius wind turbine is considered as one of the solutions for harvesting the kinetic energy from the wind in the urban areas, due to magnificent features such as, low construction cost, high starting torque, and self-starting ability especially at low wind speed. However, the conventional rotor suffers from low efficiency. Thus, modifying the configuration of the rotor may be an effective solution for providing electricity to the communities with no access to the power grid. Thus, this investigation aims to study numerically the effect of adding two inner blades on the performance of the Savonius wind rotor at low tip speed ratios (TSRs). The simulations are carried out using the two-dimensional simulation with the assist of ANSYS software. For turbulence modelling, the K-ε/realizable model was adopted in this study. Power coefficient (C p ) and torque coefficient (C t ) at various TSRs for the rotor are determined under a constant external overlap of 0.018 m. Furthermore, the effect of space between the inner blades was also investigated using three values of spacing. The simulation results show that the rotor with two inner blades performs better than the same rotor without inner blades at all tested TSRs expect at low considered values of 0.2 and 0.25. The heights Cp was 0.188 with 17.1% performance improvement at TSR = 0.4. Furthermore, the numerical results show that C p values decrease with the decrease of the space between the blades.

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Section: Methodsmentioning

confidence: 99%

“…They reported that the extracted power was three times more than the rotor without a nozzle. Al-Ghriybah et al, [24] studied the effect of inner blade position on the performance of the conventional rotor. They found that the maximum Cp can be generated when the inner blade tip is parallel with rotor tip.…”

Section: Introductionmentioning

confidence: 99%

Performance of the Savonius Wind Rotor with Two Inner Blades at Low Tip Speed Ratio

Al-Ghriybah¹,

Zulkafli²,

Didane³

et al. 2020

CFDL

Self Cite

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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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“…Moreover, Khalfallah and Koliub [11] studied the effects of dust particle roughness on wind turbine power production in a desert site. Further examples of the latest research pointing out the importance of this issue can be found in references [12,13].…”

Section: Introductionmentioning

confidence: 99%

Performance assessment and optimization of a helical Savonius wind turbine by modifying the Bach’s section

et al. 2021

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In this paper, we attempted to measure the effect of Bach’s section, which presents a high-power coefficient in the standard Savonius model, on the performance of the helical Savonius wind turbine, by observing the parameters affecting turbine performance. Assessment methods based on the tip speed ratio, torque variation, flow field characterizations, and the power coefficient are performed. The present issue was stimulated using the turbulence model SST (k- ω) at 6, 8, and 10 m/s wind flow velocities via COMSOL software. Numerical simulation was validated employing previous articles. Outputs demonstrate that Bach-primary and Bach-developed wind turbine models have less flow separation at the spoke-end than the simple helical Savonius model, ultimately improving wind turbines’ total performance and reducing spoke-dynamic loads. Compared with the basic model, the Bach-developed model shows an 18.3% performance improvement in the maximum power coefficient. Bach’s primary model also offers a 12.4% increase in power production than the initial model’s best performance. Furthermore, the results indicate that changing the geometric parameters of the Bach model at high velocities (in turbulent flows) does not significantly affect improving performance.

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The effect of inner blade position on the performance of the Savonius rotor

Cited by 26 publications

References 36 publications

Performance of the Savonius Wind Rotor with Two Inner Blades at Low Tip Speed Ratio

Performance of the Savonius Wind Rotor with Two Inner Blades at Low Tip Speed Ratio

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

Performance assessment and optimization of a helical Savonius wind turbine by modifying the Bach’s section

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