Showing papers on "Savonius wind turbine published in 2017"
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TL;DR: In this paper, a CFD study is conducted in order to characterize the dynamic behavior of a Savonius vertical axis wind turbine, which is executed using the open source code, OpenFOAM.
114 citations
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TL;DR: In this paper, the Savonius rotor was used to improve the performance of a wind turbine by optimizing the effects of different geometric parameters and by developing new design, which achieved an improvement in the coefficient of performance of 27.3% compared to the conventional rotor.
83 citations
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TL;DR: In this paper, a Savonius-style vertical axis wind turbine with direct discharge flow capability in order to ventilate buildings was designed and validated using available experimental results in literature, and two design modifications, variations in cross-section with respect to the height of rotor and conical shaft in the middle of wind rotor are proposed.
62 citations
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TL;DR: In this paper, a parametric modeling and optimization method for wind turbines was proposed to obtain the highest power output, in which a quadratic polynomial curve was bent to describe a blade.
Abstract: Under the inspiration of polar coordinates, a novel parametric modeling and optimization method for Savonius wind turbines was proposed to obtain the highest power output, in which a quadratic polynomial curve was bent to describe a blade. Only two design parameters are needed for the shape-complicated blade. Therefore, this novel method reduces sampling scale. A series of transient simulations was run to get the optimal performance coefficient (power coefficient C p) for different modified turbines based on computational fluid dynamics (CFD) method. Then, a global response surface model and a more precise local response surface model were created according to Kriging Method. These models defined the relationship between optimization objective Cp and design parameters. Particle swarm optimization (PSO) algorithm was applied to find the optimal design based on these response surface models. Finally, the optimal Savonius blade shaped like a “hook” was obtained. Cm (torque coefficient), Cp and flow structure were compared for the optimal design and the classical design. The results demonstrate that the optimal Savonius turbine has excellent comprehensive performance. The power coefficient Cp is significantly increased from 0.247 to 0.262 (6% higher). The weight of the optimal blade is reduced by 17.9%.
49 citations
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TL;DR: In this paper, the Savonius turbine numerical modeling and mutual turbine interaction in a linear array farm was carried out using the OpenFOAM solver, and the results showed a performance increase as the distance between the turbines reduces, higher efficiency for small wind incidence angles, and a larger number of turbines.
41 citations
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TL;DR: In this article, the authors described the behavior of a vertical axis Savonius wind turbine (SWT) in four-way lane highways during South-West and North-East monsoons.
28 citations
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TL;DR: In this paper, a new hybrid power system has been proposed combining the conventional Savonius wind turbine and split channel mechanisms, and a simulation method for predicting their aerodynamic performance using control volume based CFD package of ANSYS CFX.
26 citations
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12 Mar 2017TL;DR: Results show that the new rotor has no negative torque in one complete revolution and that the 3-bladed rotor has the best aerodynamic performance, in a manner that, it reaches a maximum power coefficient of 0.21 at TSR = 0.5.
Abstract: Savonius turbines have been the subject of various wind energy projects due to their good starting characteristics, easy installation, and independency of wind direction. However, the Savonius roto...
14 citations
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TL;DR: In this article, the authors presented a study, design and manufacturing of a small residential renewable energy conversion system mainly based on a local manufactured Savonius-rotor type Vertical Axis Wind Turbine, equipped with Photovoltaic Panel and a Storage System (Battery).
14 citations
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TL;DR: In this article, three-dimensional numerical simulations of combined Darrieus-Savonius wind turbine D-SWT for applications in urban and isolated areas for lighting, pumping water, etc.
Abstract: Modeling and simulation of mechanical structures in development phase are fundamental to optimize and improve the stability and reliability of the final product as well as to reduce the cost of prototyping and testing Wind turbines are subject to critical loading to the centrifugal force due to wind speed and gravitational force The present study discusses three-dimensional numerical simulations of combined Darrieus-Savonius wind turbine D-SWT for applications in urban and isolated areas for lighting, pumping water, etc The Darrieus turbine is used to produce wind power and the Savonius rotor to start the system Finite Element Analysis (FEA) using SolidWorks 2015 is employed to generate the geometry of the structure and SolidWorks Simulation to investigate the stability and reliability static on the structure of the D-WST built by two types of material of the blade Galvanized Steel (GS) and Aluminum alloys 1060-H18 (ALU) Mechanical parameter of the structure are calculated for critical loading conditions, including the gravity and wind pressure loading due to the wind speed of 23m/s Simulations results indicate no structural failure is predicted for all components of the D-SWT for both materials used according to Von Mises criterion stresses and the factors of safety of the most fragile material are greater than (the unity) 1 The maximum displacements found (384 & 681mm), occurred at the tip blades (free ends levels) These displacements are accepted relatively to the structure size
12 citations
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TL;DR: In this article, a two-dimensional parametric analysis of a modified Savonius wind turbine using computational fluid dynamics is presented, showing the effects of three independent parameters of the rotor.
Abstract: This article aims to present a two-dimensional parametric analysis of a modified Savonius wind turbine using computational fluid dynamics The effects of three independent parameters of the rotor,
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TL;DR: In this paper, the effect of the number and diameter of the Savonius blade wind turbine with an additional concentrator was evaluated at lower wind speeds of 2-5 m/s.
Abstract: Savonius turbine is a type of vertical-axis wind turbines. The turbine has a potential to be developed as it has a simple construction and is suitable for low wind speeds. However, the turbine is still rarely used because of the low efficiency of the turbine compared to other turbines. The low efficiency of the turbine is due to the negative moment. Some efforts have been done to reduce the negative moment such as by adding a wind concentrator. The wind concentrator can steer the incoming wind toward the turbine blades that generate positive moments, consequently, the generated power increases. The aim of this research is to determine the effect of the number and diameter of the Savonius blade wind turbine with an additional concentrator. The concentrator had a concentration ratio of 6:1 and it was tested at the lower wind speeds of 2-5 m/s. The result shows that adding a wind concentrator can increase the rotational speed of the rotor, power coefficient, and the turbine power. The Savonius turbine with two blades has the best performance compared to the three and four blades. The Savonius blade wind turbine with the rotor diameter of 12 cm is the best Savonius turbine for the concentration ratio of 6:1.
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01 Apr 2017TL;DR: In this article, the authors explored the idea of telescopic Savonius wind turbine with emphasis on the flow characteristics and associated drag on the buckets due to its geometric difference, and a three-dimensional numerical study has been carried out by Star CCM+ to predict the drag coefficient variation in relation to the rotor angles.
Abstract: Savonius wind turbines holds a vital place in small wind turbine arena, for its unique features such as simplicity, omni directionality and low maintenance, despite its lower efficiency than its counterparts. Several experimental and numerical studies focused on improving the efficiency and optimization of geometrical parameters, yet a reliable technique to reduce the thrust load at high wind is still lacking. The current study explores the novel idea of telescopic Savonius wind turbine with emphasis on the flow characteristics and associated drag on the buckets due to its geometric difference. A three-dimensional numerical study has been carried out by Star CCM+ to predict the drag coefficient variation in relation to the rotor angles. An analytical model is developed in conjunction to compute the overall performance of the turbine.
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01 Apr 2017TL;DR: In this paper, the authors investigated numerically the performance of a helical Savonius wind rotor with a twist angle of 45°, where the twist is performed on a modified profile of the rotor blade.
Abstract: This study aims to investigate numerically the performance of a helical Savonius wind rotor with a twist angle of 45°. The twist is performed on a modified profile of the rotor blade. The power coefficient (Cp), the torque coefficient (CT), and the static torque coefficient (CTS) are computed under a constant aspect ratio of 1.0 and overlap ratio of 0.15. The numerical results presented in this paper are obtained using the three-dimensional incompressible unsteady Reynolds-Averaged Navier-Stokes equations along with the RNG k-e turbulence model. A comparison between the present helical Savonius wind turbine of modified rotor and the helical Savonius wind turbine of conventional rotor shows better performance for the present modification. The maximum power coefficient and the maximum torque coefficient for the present helical modified rotor are 0.22 and 0.41, respectively.
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05 Apr 2017
TL;DR: In this article, the authors presented a wind turbine with a gap control device capable of improving operation efficiency of the whole by controlling a gap between blades by each driving section when the wind turbine operates.
Abstract: The present invention provides a savonius wind turbine having a gap control device, capable of improving operation efficiency of the whole by controlling a gap between blades by each driving section when the wind turbine operates According to the present invention, the savonius wind turbine includes: a blade unit having a first blade and a second blade adjacent to the first blade; an upper plate connected to the upper surface of the blade unit; a lower plate connected to the lower surface of the blade unit; and the gap control device controlling the gap between the first blade and the second blade while moving the first blade and the second blade in the horizontal direction at the same time The gap control device includes: a motor-gear assembly; a first moving unit connected to the motor-gear assembly and horizontally moving the first blade; and a second moving unit horizontally moving the second blade The motor-gear assembly includes: a motor; a main gear shaft rotating in accordance with the rotation of the motor; and a main gear installed on one end of the main gear shaft
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23 Nov 2017
TL;DR: In this paper, a new model of Savonius wind turbine has been designed to increase the low performance of the wind rotor, and the effect of wind speed on the static rotor performance has been analyzed numerically using solid-work flow simulation (SWFS).
Abstract: In the present study, a new model of Savonius wind turbine has been designed to increase the low performance of the Savonius wind rotor, a type of vertical-axis wind rotor, and the effect of wind speed on the static rotor performance has been analyzed numerically using solid-work flow simulation (SWFS). SWFS is based on the Reynolds Averaged Navier-Stokes (RANS) equations with the standard k-e turbulence model. These equations were solved by a finite volume discretization method. Further, the effects of rotor geometries and end plate on static torque are also discussed. In order to clarify the new designed of the rotor, static torque was measured with various blade sizes and end plate shape. From the study, found that the use of both upper and lower end plats significantly increase the torque by 40% compared with no end plates. Additionally, it was also observed that the torque of rotors increases proportionally to blade size and end plate shapes. Moreover, the results showed that model 2 has produced more torque compared to other models.
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01 Aug 2017
TL;DR: This paper focuses on the implementation of a small-scale Savonius wind turbine as an auxiliary supply to charge the battery of the sensor node and demonstrates the increase in the efficiency of the generator through the use of WED.
Abstract: In smart-grid systems, sensor nodes are deployed on transmission structures to detect different forms of natural and malicious physical events that can adversely affect the performance of the grid. The operation of the sensor node is limited to its battery life. Usually solar, vibrational and thermal are used to power up these devices, but few only consider wind for this application. This paper focuses on the implementation of a small-scale Savonius wind turbine as an auxiliary supply to charge the battery of the sensor node. A wind enhancement device (WED) is designed and introduced to be able to utilize lower wind speeds for continuous operation. Its design was based on a typical open-circuit wind tunnel, and an optimum flange height for the diffuser section has been characterized using SOLIDWORKS Flow Simulation Software to further improve the wind speed inside the WED. The performance of the Savonius wind turbine was compared with and without the WED to determine its effect on the speed of the turbine, and output voltage, current and power of the generator. The results demonstrate the increase in the efficiency of the generator through the use of WED.
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01 Apr 2017TL;DR: In this article, a three-bladed savonius wind turbine that can be easily manufactured at low cost and which is effective in turbulent air condition is proposed for this purpose and the pressure distribution over the turbines blades and the revolutions per minute (RPM) of the turbine are estimated/calculated by using a wind tunnel.
Abstract: Airports require constant power supply throughout the year. As a solution to this growing demand, power requirement of airports can be supported from renewable energy sources such as wind and solar. Wind energy can be harvested near airports by using a series of wind turbines of small sizes. Such small turbine can be placed around airports without violating aviation regulations. In this work, a three-bladed savonius wind turbine that can be easily manufactured at low cost and which is effective in turbulent air condition is proposed for this purpose. The pressure distribution over the turbines blades and the revolutions per minute (RPM) of the turbine are estimated/calculated by using a wind tunnel. In this investigation, it was observed that the savonius turbine designed for airport installation has the desirable characteristic of low cut-in speed. The flow around the turbine is visualized using a water flow channel and colorants. The visualization technique aids in understanding the performance of turbine against smooth as well as turbulent wind conditions.
09 Sep 2017
TL;DR: In this paper, the authors analyzed the influence of adding fin on blade of a wind turbine type L with variation of wind speed and found that the additioning fin affects the cut in speed with the number of fin in the blade.
Abstract: This research aims to analyze the influence of additioning fin on blade of the cut in speed by a savonius wind turbine type L with variation of wind speed. This research used a savonius wind turbine type L with a rotor diameter of 1.1 m and a rotor height of 1.4 m. The method used is the experimental method by varying the addition of the fin on blade and the wind speed. Variables taken in this research are wind speed, variation of additioning fin, and cut in speed by wind turbine. Variations of additioning fin are without fin, 1 fin, 2 fin, 3 fin, 4 fin. Testing tools using anemometer. The results of the research was found that the additioning fin affect the cut in speed with the number of fin in the blade is linearly result in increasing ot the cut in speed. The lowest cut in speed is 2 m/s achieved the addition of 4 fin on the blade.
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TL;DR: In this article, the performance of the Helical Savonius VAWT rotor was evaluated with and without using a wind concentrator, and the results indicated that the blade produced its best performance when tested using wind concentrators at concave-blade position in terms of angular speed ( ω ), tip speed ratio ( TSR ), and generated electrical power (P E ).
Abstract: The air streams from the outlet of an air compressor can be used to generate electricity. For instance, if a micro-sized Vertical-Axis Wind-Turbine (VAWT) is installed towards the airflow, some amount of electricity can be generated before being stored in a battery bank. The research’s objectives are to design, fabricate and analyze the performance of Helical Savonius VAWT blade rotors, which is tested with and without using a wind concentrator. The Helical Savonius VAWT is tested at 0 cm without the concentrator, whereas the blade rotor is tested at concave-blade position when using the concentrator. The blade and the wind concentrator designs were based on the dimensions and the constant airflow of the air compressor. The findings suggested that the blade produced its best performance when tested using wind concentrator at concave-blade position in terms of angular speed ( ω ), tip speed ratio ( TSR ) and the generated electrical power ( P E ). The findings concluded that the addition of wind concentrator increases the airflow which then provided better performances on the blades.
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03 Jan 2017
TL;DR: In this article, the influence of ODGV on the flow pattern characteristic around a Savonius wind turbine was studied. But the authors only used the Navier-Stokes equations with the standard k-e turbulent model.
Abstract: Standart Savonius wind turbine have a low performance such as low coefficient of power and low coefficient of torque compared with another type of wind turbine. This phenomenon occurs because the wind stream can cause the negative pressure at the returning rotor. To solve this problem, standard Savonius combined with Omni Directional Guide Vane (ODGV) proposed. The aim of this research is to study the influence of ODGV on the flow pattern characteristic around of Savonius wind turbine. The numerical model is based on the Navier-Stokes equations with the standard k-e turbulent model. This equation solved by a finite volume discretization method. This case was analyzed by commercial computational fluid dynamics solver such as SolidWorks Flow Simulations. Simulations were performed at the different wind directions; there are 0°, 30°,60° at 4 m/s wind speed. The numerical method validated with the past experimental data. The result indicated that the ODGV able to augment air flow to advancing rotor and decrea...
31 May 2017
TL;DR: In this article, a small-scale electrical energy plant was constructed by utilizing a Savonius wind turbine U three blades to generate electricity by using a generator and as a storage current battery, and the location for this experiment is at the area of gunung panggilun, precisely in building E on 5th floor the Faculty of Industrial Technology, Bung Hatta University.
Abstract: Indonesia is famous for its potential natural resource especially energy in the form of mining, water and air. Wind energy is a natural resource that can be obtained for free of charge among the most abundant and available continuously throughout the year. The issue of energy is one of the greatest challenges facing today's society in the world. The utilization of wind energy can be used in sloping areas, mountains, and the waterfront. The principle of conversion of wind energy into electrical energy is as follows: The wind through the blades of the wind turbine spinning pinwheel cause, round lead generator wind turbine spins that into electrical energy. More than 86% of the world's energy comes from fossil fuels, while the demand for energy worldwide continues to grow rapidly. We all know that the source of non-renewable nature of fossil energy if we only using fossil fuels as an energy source, a current source of energy will be depleted. Then the use of electrical energy derived from fossil also have an effect on the levels of emissions (CO2) in the air so called that the greenhouse effect. The application of wind energy in this study utilized as a small-scale electrical energy plant by utilizing a savonius wind turbine U three blades to generate electricity by using a generator and as a storage current battery. From design calculation results is obtained material on the blade is iron plate with a diameter of 0.6 m and blade’s high of 0.9 m. The location for this experiment is at the area of gunung panggilun, precisely in building E on 5th floor the Faculty of Industrial Technology, Bung Hatta University.
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19 Oct 2017
TL;DR: In this article, a wind turbine may be provided with two rotor assemblies having their curved turbine blades arranged so that the rotor assemblies are driven to rotate in opposing rotational directions in a Savonius wind turbine.
Abstract: A Savonius wind turbine includes a rotor assembly that rotates about a longitudinal axis. The rotor assembly includes at least two curved turbine blades extending parallel to the longitudinal axis and at least two support discs connected to the at least two curved turbine blades. At least one of the at least two support discs has at least one relief vent defined therein for allowing air to pass through the at least one support disc. The wind turbine may be provided with two rotor assemblies having their curved turbine blades arranged so that the rotor assemblies are driven to rotate in opposing rotational directions.
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19 Oct 2017
TL;DR: A Savonius wind turbine includes a rotor assembly that rotates about a longitudinal axis The rotor assembly includes at least two curved turbine blades extending parallel to the longitudinal axis.
Abstract: A Savonius wind turbine includes a rotor assembly that rotates about a longitudinal axis The rotor assembly includes at least two curved turbine blades extending parallel to the longitudinal axis and at least two support discs connected to the at least two curved turbine blades At least one of the at least two support discs has at least one relief vent defined therein for allowing air to pass through the at least one support disc The wind turbine may be provided with two rotor assemblies having their curved turbine blades arranged so that the rotor assemblies are driven to rotate in opposing rotational directions
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21 Jul 2017TL;DR: In this paper, a new wind turbine, called resistance type vertical axial wind turbine (VAWT) with soft blades, was introduced to improve the aerodynamic performances of traditional VAWT.
Abstract: This article introduces a new wind turbine, called resistance type vertical axial wind turbine (VAWT) with soft blades. The blades of the new turbine resist the wind and collect the power along the wind direction, while canceled the resistance against the wind direction. The new work mechanism was conceived to improve the aerodynamic performances of traditional VAWT. To prove the above supposing, two wind turbine models with soft blades were set up to find the static torque coefficients by numerical study. The simulation results of both models were compared with the experiment data of Savonius wind turbines models with the same sweeping area. The simulation results showed that: 1) The comparison between experiment data and CFD analysis on the same Savonius wind turbine has the reliability; 2) The soft bladed VAWT produces no negative static torque and it starts normally under low wind speed condition.
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TL;DR: In this paper, a wind accelerating and guiding rotor house (WAG-RH) was integrated with a solar heating system to enhance the efficiency of the vertical axis rotor of the wind generator.
Abstract: Rooftop, building integrated and building augmented micro wind systems have the potential for small scale power generation in the built environment. Nevertheless, the expansion of micro wind technology is very slow and its market is strongly affected by the low efficiency of conventional wind generators. WAG-RH (Wind Accelerating and Guiding Rotor House) which is a new technique introduced to enhance the efficiency of vertical axis rotor. The present study utilizes other green energy element by integrating the WAG-RH with a solar heating system. In this effort roof of the WAG-RH has been utilized to heat air through micro solar chimney for creating buoyancy effect in the air flow channel at rotor zone in the WAG-RH. The integration is capable of improving the performance of rotor setup in the WAG-RH as well as providing hot air with sufficient air mass flow rate for space heating. The WAG-RH had brought about 138% increase in the performance coefficient(Cp) of conventional three bladed Savonius rotor, whereas solar integrated WAG-RH has contributed 162% increase in the Cp of the same rotor.