Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine

Sahim, Kaprawi; Santoso, Dyos; Puspitasari, Dewi

doi:10.1155/2018/3568542

Cited by 36 publications

(17 citation statements)

References 24 publications

(24 reference statements)

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“…The C p attains its highest value of the tip speed ratio TSR = 4.96 for radius equal to 0.7 m and it decreases significantly with the increase of the radius. We find the same result found by Sahim et al [46], and the numerical results show the interest of a variable radius rotor, whereby when we increase the rotor radius, obviously, the C p decreases. In contrast, the power generated by the rotor increases when the rotor radius increases, as shown in Figure 13b.…”

Section: Rotor Radiussupporting

confidence: 91%

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

et al. 2020

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Growing energy demand is causing a significant decrease in the world’s hydrocarbon stock in addition to the pollution of our ecosystem. Based on this observation, the search for alternative sorts of energy to fossil fuels is being increasingly explored and exploited. Wind energy is experiencing a very important development, and it offers a very profitable opportunity for exploitation since the wind is always available and inexhaustible. Several technical solutions exist to exploit wind energy, such as floating vertical axis wind turbines (F-VAWTs), which provide an attractive and cost-effective solution for exploiting higher resources of offshore wind in deep water areas. Recently, the use of the Darrieus vertical axis wind turbine (VAWT) offshore has attracted increased interest because it offers significant advantages over horizontal axis wind turbines (HAWTs). In this context, this article presents a new concept of floating Darrieus-type straight-bladed turbine with three-stage rotors. A double-multiple stream tube (DMST) model is used for aerodynamic simulations to examine several critical parameters, including, solidity turbine, number of blades, rotor radius, aspect ratio, wind velocity, and rotor height. This study also allows to identify a low solidity turbine (σ = 0.3), offering the best aerodynamic performance, while a two-bladed design is recommended. Moreover, the results also indicate the interest of a variable radius rotor, as well as the variation of the height as a function of the wind speed on the aerodynamic efficiency.

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Section: Rotor Radiussupporting

confidence: 91%

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

et al. 2020

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“…Due to the main feature of the Savonius rotor, self-starting, studies have been conducted on the Savonius rotor as a starter for the other types of the VAWTs which suffered from low starting performance. Sahim et al [8] have suggested the combine between Savonius and Darrieus rotors which will give better performance at low wind speeds. Torque coefficient (Ct) was evaluated for various Tip Speed Ratio (TSR) with different values of turbine diameter.…”

Section: Introductionmentioning

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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“…In a combined or hybrid Darrieus-Savonius turbine, the radius heights of Savonius blade influence the performance characteristics of the combined rotor. There is a limit value for the radius ratio so that the combined turbine works optimally [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

Puspitasari¹,

Sahim²

2019

JMES

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A vertical hybrid turbine commonly consists of a Darrieus and Savonius rotor where the Savonius is inside Darrieus turbine. This paper describes the experimental study of hybrid Darrieus-Savonius wind turbines by variation in Savonius blade height. In this case, the effect of the blade height of the Savonius blade was studied experimentally in a subsonic wind tunnel. The effect of the height of a Savonius blade relative to that of Darrieus called blade height ratios δ was investigated to know the hybrid turbine performance. The performance is represented by power and torque coefficient. The result shows that the hybrid turbine with height ratio greater than unity δ = 1.4 gives the highest power CP = 0.20 and torque coefficient CT = 0.129. It is investigated that the torque and the power coefficient have a higher value than that of Darrieus turbine, in which the increase in power and torque coefficient are 48% and 29%, respectively. This hybrid wind turbine with a blade height ratio greater than unity can be considered as an important variable in the wind turbine construction.

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Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine

Cited by 36 publications

References 24 publications

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors

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

Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine

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