Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Driss, Zied

doi:10.11648/j.ijfmts.20150101.13

Cited by 5 publications

(5 citation statements)

References 10 publications

(17 reference statements)

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“…The 2-D simulation results showed a good agreement with the published experimental results by Driess et al, [28]. Figure 4 shows the results in terms of Cp at three tested TSRs.…”

Section: Resultssupporting

confidence: 84%

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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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“…The 2-D simulation results showed a good agreement with the published experimental results by Driess et al, [28]. Figure 4 shows the results in terms of Cp at three tested TSRs.…”

Section: Resultssupporting

confidence: 84%

“…A validation study was also conducted to the experimental study proposed by Driss et al, [28] in order to validate the numerical simulation procedure.…”

Section: Methodsmentioning

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

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show abstract

“…Savonius rotor with an internal overlap ratio between their blades shows a better performance in their starting [15]. On the other hand, studies such as Driss et al [34] have determined that the external overlap between the blades decreases the performance of the conventional rotor. Thus, the current study aims to increase the performance of the rotor with an external overlap.…”

Section: Geometry Configurationmentioning

confidence: 99%

Numerical Investigation of Inner Blade Effects on the Conventional Savonius Rotor with External Overlap

Al-Ghriybah¹,

Zulkafli²,

Didane³

2020

J. sustain. dev. energy water environ. syst.

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The Savonius wind turbine is considered as one of the best vertical axis wind turbines for harvesting the kinetic energy from the wind in the urban areas, due to magnificent features such as high starting torque, low construction and maintenance costs, simple design, and self-starting ability especially at low wind speed. However, the conventional style of the Savonius rotor suffers from low efficiency. Consequently, modifying the configuration of the rotor may be an appropriate solution for providing electricity to the communities with no access to the power grid. Thus, this study aims to enhance the performance of the conventional Savonius rotor with an external overlap by adding an inner blade to the rotor configuration. Hence, a comparison study between five new arrangements against the conventional rotor in terms of power coefficient (Cp) and torque coefficient (Ct) is performed through a two-dimensional simulation by using ANSYS Fluent 19.2. The k-ε/Realizable turbulence model is employed in the simulation. Results conclude that inner blade with an angle of 120° increases the power coefficient by 41%, 39%, and 7% at tip speed ratio (TSR) = 0.7, 0.6, and 0.5, respectively.

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“…By increasing the Reynolds number, the power coefficient increases. Zied Driss et al [3] investigated the effect of external overlap ratios in the performance of the Savonius turbine in order to fabricate with overlaps ratios equals to 0, 0.1, 0.2 and 0.3. The models were tested in an open-jet-type wind tunnel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Radial and Axial Clearance on the Performance of a Specially Designed Savonius Vertical Axiswind Turbine

EL-Samanoudy

A.E

Fawy

2019

Journal of Al-Azhar University Engineering Sector

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Savonius wind turbine (SWT) has a simple construction and can produce electricity in any wind direction. Although Savonius wind rotor has many advantages, but it has a low power coefficient when compared with other horizontal and vertical axis wind rotors. In this paper; an experimental study is carried out to investigate the effect of geometrical parameters (radial and axial clearances) on the performance of SWT in terms of torque coefficient and power coefficient. For this reason, analysis is carried out to optimize and improve the operation of such turbines. Two buckets' Savonius rotor model was selected, designed and manufactured with a diameter of ٨0 cm and height of 80 cm; without having a shaft between the end plates. The designed model was fabricated and tested in a low speed wind tunnel under an open type test section.The results of the present study show that, a maximum power coefficient was obtained at a clearance (ea) = 0.14d in axial direction. the Cp/Cp.max value for clearance (ea) = 0.14d in axial direction is compared with other investigation and founded that The Cp/Cp.max value of the present SVWT is higher than the other investigation at different value of the tip speed ratio (λ).

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Evaluation of the Savonius Wind Rotor Performance for Different External Overlap Ratios

Cited by 5 publications

References 10 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

Numerical Investigation of Inner Blade Effects on the Conventional Savonius Rotor with External Overlap

Effect of Radial and Axial Clearance on the Performance of a Specially Designed Savonius Vertical Axiswind Turbine

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