Performance evaluation of a novel vertical axis wind turbine with coaxial contra-rotating concept

Didane, Djamal Hissein; Rosly, Nurhayati; Zulkafli, Mohd Fadhli; Shamsudin, Syariful Syafiq

doi:10.1016/j.renene.2017.08.070

Cited by 58 publications

(45 citation statements)

References 19 publications

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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%

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

Didane¹,

Anuar²,

Batcha³

et al. 2020

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Didane¹,

Anuar²,

Batcha³

et al. 2020

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“…Generally, the main drawback of the VAWT is the low efficiency compared to the HAWT, which requires more research on its aerodynamics in order to improve its performance characteristics [10]. This type of wind machines can be categorized into two main configurations i.e.…”

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

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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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“…It has shown to work effectively and has the ability to improve the conversion efficiency of a wind turbine significantly in both wind turbine design with the vertical axis 17,18 and horizontal axis.. [19][20][21][22][23] Although the counter-rotation concept is widespread in HAWTs, only limited literature is recently starting to appear in VAWT applications. A recent experimental study performed by Didane et al 17 indicated that an improvement of up to 43% and 40% of torque coefficient and power coefficient was, respectively, attainable using the counter-rotating technique in VAWT. A similar outcome was also achieved by Didane et al 18 using a numerical simulation approach.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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This paper describes the study of a small vertical-axis wind turbine (VAWT) with a combined design of Darrius and Savonius counter-rotating rotors. The main purpose of this study is to improve the extraction capabilities of a single-rotor VAWT by using two distinct rotor designs while adopting the counter-rotating technique. Given that the conversion capabilities and operational speed of the existing wind turbines are still limited, the current technique is used to enhance the efficiency and expand the operating wind speed range of the VAWT. The Darrius and Savonius counter-rotating rotors were exposed to a similar upstream wind speed using a centrifugal blower. It was found that the Savonius-Darrius counter-rotating rotor was able to operate effectively, particularly at the low-speed wind. By looking at the individual performance of the rotors, it was observed that the conversion efficiency of the H-type rotor increases as the wind speed increases. However, in the case of the S-type rotor, it is higher at lower wind speed and tends to decrease as the operating speed increases. Thus, the maximum efficiency of the S-type rotor was achieved at low speed, whereas the H-type rotor has achieved its maximum efficiency at the highest operating wind speed. The average efficiency of the present Savonius-Darrius counter-rotating rotor has been improved to reach almost 42% and 30% more efficiency in terms of torque and power, respectively. Highlights • The effectiveness of combining S type and H type on a counter-rotating VAWT has been studied. • The new combined design was able to enhance the performance of the system significantly and was able to operate in a low-speed wind condition. • An average power coefficient and torque coefficient of up to 30% and 42% were, respectively, achieved using this technique.

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Performance evaluation of a novel vertical axis wind turbine with coaxial contra-rotating concept

Cited by 58 publications

References 19 publications

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

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

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

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

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