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Savonius wind turbine

About: Savonius wind turbine is a research topic. Over the lifetime, 333 publications have been published within this topic receiving 6521 citations.


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Book ChapterDOI
01 Jan 2015
TL;DR: The primary aim of this work is to provide a simple methodology for the robust optimal design of the Savonius wind turbine using the traditional Taguchi method and dynamic computational fluid dynamics models of the design sets.
Abstract: The Savonius wind turbine, a class of vertical axis wind turbine (VAWT), is simple and provides a better cost-benefit ratio. It works on the principle of differential drag and is effective in rooftop and ground mounting. Despite the advantages of Savonius wind rotors, they are not preferred due to their low aerodynamic performance levels. In order to address this, several experimental and numerical studies have been carried out in recent years. The primary aim of this work is to provide a simple methodology for the robust optimal design of the Savonius wind turbine. In the parameter design stage, the performance of the turbine is maximized using the traditional Taguchi method. An L27 orthogonal array is used considering five factors of three levels each, which affect C p . Wind speed is considered to be the noise factor. Signal-noise ratio (SNR) metric is used to find the optimal settings for robust design. The aerodynamic performance of the turbine is investigated through dynamic computational fluid dynamics (CFD) models of the design sets. The numerical models used for the simulations are also discussed.

4 citations

09 Dec 2014
TL;DR: In this paper, the influence of blade overlap, blade arc angle and the diameter of the hot air inlet hole on the torque and power coefficient of a Savonius wind turbine was investigated.
Abstract: When compared with other wind turbines, drag driven vertical axis Savonius wind turbine offers lower power coefficient due to its slow turning speed. However, they have many advantages over others, such as simplicity of manufacturing, ability to operate in any wind direction, and having a good starting torque at low wind speed. They are well suited to be integrated in urban environment as small scale power generating wind mills. Waste heats or naturally available heat sources such as geothermal and solar energy can be utilized to produce swirling flow when there is a source of angular momentum. Previous computational work suggests that the performance of Savonius turbine can be improved by providing a hot swirling flow inside the turbine chamber. The swirling flow can be induced by a design similar to that of split channels, which includes one or a few vertical slits, and is currently used to onset fire whirls in the laboratories. In the present experimental study, the influence of blade overlap, blade arc angle and the diameter of the hot air inlet hole on the torque and power coefficient have been investigated. The results indicate that the maximum power coefficient for a 258 mm diameter rotor occurs at 28 mm blade overlap, '195°' blade angle and 9 mm diameter of hot air inlet hole.

4 citations

Proceedings ArticleDOI
13 Jul 2018
TL;DR: In this paper, the authors focused on a hybrid wind turbine with Savonius rotor placed in the middle of the Darrieus-Savonius wind turbine (type-A).
Abstract: Renewable energy is an important thing to be concerned since the rapid decrease of natural energy. Wind power is one of renewable energy which can be used to be converted into electrical energy. Darrieus-Savonius wind turbine is a tool used to convert the wind power. The combination of Savonius rotor which has self-starting ability and Darrieus rotor which has high efficiency make this hybrid wind turbine often used in urban area. This numerical study focused on Darrieus-Savonius wind turbine with Savonius rotor placed in the middle of the Darrieus rotor (type-A) and Savonius rotor placed under Darrieus rotor (type-B) at 5 m/s, 10 m/s, and 15 m/s wind velocity. Flow interaction between Savonius rotor and Darrieus rotor occurred in the type-A configuration that caused performance reduction from each rotor. It is proved by the torque generated by type-A configuration is lower than the torque generated by type-B configuration. Generally, in the low tip speed ratio, coefficient of power of type-A wind turbine is higher than the type-B wind turbine. It is caused by the swept area of type-A wind turbine is smaller than the type-B wind turbine.Renewable energy is an important thing to be concerned since the rapid decrease of natural energy. Wind power is one of renewable energy which can be used to be converted into electrical energy. Darrieus-Savonius wind turbine is a tool used to convert the wind power. The combination of Savonius rotor which has self-starting ability and Darrieus rotor which has high efficiency make this hybrid wind turbine often used in urban area. This numerical study focused on Darrieus-Savonius wind turbine with Savonius rotor placed in the middle of the Darrieus rotor (type-A) and Savonius rotor placed under Darrieus rotor (type-B) at 5 m/s, 10 m/s, and 15 m/s wind velocity. Flow interaction between Savonius rotor and Darrieus rotor occurred in the type-A configuration that caused performance reduction from each rotor. It is proved by the torque generated by type-A configuration is lower than the torque generated by type-B configuration. Generally, in the low tip speed ratio, coefficient of power of type-A wind turbine...

4 citations

Journal ArticleDOI
TL;DR: In this paper, a two-dimensional unsteady simulation of a wind turbine with Bach-profile blades with a constant freestream velocity of 4 m/s was performed with a corresponding Reynolds number of 20,000.
Abstract: Savonius wind turbine with Bach-profile blades is considered in this study. Previous studies have shown that a rotor with the Bach-profile blade produces better performance than a standard Savonius turbine. This study focuses on the blade shape factor variations of the Bach-profile blade to give the best performance. Two-dimensional unsteady simulations are performed with moving mesh. The configuration being tested is the Savonius rotor with Bach-profile blades with an arc angle of 135◦ . The blade shape factor is varied 0.2, 0.3, 0.4 at a constant freestream velocity of 4 m/s, with a corresponding Reynolds number of 20,000. The k-ω Shear Stress Transport turbulence model was used, with secondorder discretization schemes for the pressure and momentum equations. The boundary conditions were set as velocity inlet for the inlet, outflow for the outlet, and walls for the blade surfaces. The top and bottom sides were set as symmetric. Results showed that the configuration with a shape factor of 0.4 gave the best performance among the others. This configuration gave a higher moment coefficient and power coefficient of about 6.8% and 7.3%, respectively. Results extracted from the simulation includes the flow structure, and the distribution of the pressure coefficients along the blade surface.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the static mechanical properties of the helical Savonius vertical axis wind turbine blade were analyzed by using finite element code ANSYS to perform the static structural analysis.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20222
202123
202056
201958
201828
201726