scholarly journals Variable Size Twin-Rotor Wind Turbine

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2543 ◽  
Author(s):  
Piotr Doerffer ◽  
Krzysztof Doerffer ◽  
Tomasz Ochrymiuk ◽  
Janusz Telega
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Efficient Operation ◽  
Turbine Efficiency ◽  
Small Wind Turbines ◽  
Strong Winds ◽  
New Feature ◽  
The Cost ◽  
Twin Rotor

The paper presents a new concept of a vertical axis wind turbine. The idea is focused on small wind turbines, and therefore, the dominating quality is safety. Another important necessary feature is efficient operation at small winds. This implies an application of the drag driven solution such as the Savonius rotor. The presented concept is aimed at reducing the rotor size and the cost of implementation. A new wind turbine solution, its efficiency, and functionality are described. The results of numerical simulations being a proof of the concept are reported. The simulations were followed by wind tunnel tests. Finally several prototypes were built and investigated for a longer period of time. The new wind turbine concept has undergone various testing and implementation efforts, making this idea matured, well proven and documented. A new feature, namely, the wind turbine size reduction at strong winds, or in other words, an increase in the wind turbine size at low winds is the reason why it is difficult to compare this turbine with other turbines on the market. The power output depends not only on the turbine efficiency but also on its varying size.

scholarly journals A numerical study of Vertical Axis Wind Turbine performances in twin-rotor configurations

2020 ◽  
Vol 1618 ◽  
pp. 052012
Author(s):  
M Guilbot ◽  
S Barre ◽  
G Balarac ◽  
C Bonamy ◽  
N Guillaud
Keyword(s):  
Wind Turbine ◽  
Numerical Study ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Twin Rotor

The Vertical Axis Wind Turbine Efficiency Evaluation by Using the CFD Methods

2015 ◽  
Vol 772 ◽  
pp. 90-95 ◽  
Author(s):  
Ion Mălăel ◽  
Valeriu Drăgan ◽  
Georgel Vizitiu
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Simple Type ◽  
Vertical Axis Wind Turbine ◽  
Turbine Efficiency ◽  
Numerical Studies ◽  
Rans Models ◽  
Unsteady Rans ◽  
Urans Cfd ◽  
Cfd Method

In this paper, numerical studies have been conducted in order to evaluate the efficiency of a vertical axis wind turbine by using CFD methods. For these studies, it has been used SIMPLE type pressure-based coupled solver. The complexity and the unsteadiness character of the flow in such a machine, requires the use of unsteady RANS models. To determine the accuracy of the solution obtained by URANS models, this paper makes a comparative analysis with the same case and LES modeling. Analyses were performed with a 2D grid consisting of two regions, a rotor and a stator. The airfoil of the VAWT is a classic NACA0018. Results indicate that the poor accuracy of the URANS CFD method is mainly due to its limitation in the vortex modeling. In general the LES modeling have a better agreement with the experimental results from the wind tunnel.

Computational Investigation of a Shrouded Vertical Axis Wind Turbine

2016 ◽  
Author(s):  
K. Vafiadis ◽  
H. Fintikakis ◽  
I. Zaproudis ◽  
A. Tourlidakis
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Urban Areas ◽  
Numerical Study ◽  
Flow Analysis ◽  
Vertical Axis ◽  
Green Energy ◽  
Vertical Axis Wind Turbine ◽  
Wide Range ◽  
Small Wind Turbines

In urban areas, it is preferable to use small wind turbines which may be integrated to a building in order to supply the local grid with green energy. The main drawback of using wind turbines in urban areas is that the air flow is affected by the existence of nearby buildings, which in conjunction with the variation of wind speed, wind direction and turbulence may adversely affect wind energy extraction. Moreover, the efficiency of a wind turbine is limited by the Betz limit. One of the methods developed to increase the efficiency of small wind turbines and to overcome the Betz limit is the introduction of a converging – diverging shroud around the turbine. Several researchers have studied the effect of shrouds on Horizontal Axis Wind Turbines, but relatively little research has been carried out on shroud augmented Vertical Axis Wind Turbines. This paper presents the numerical study of a shrouded Vertical Axis Wind Turbine. A wide range of test cases, were examined in order to predict the flow characteristics around the rotor, through the shroud and through the rotor – shroud arrangement using 3D Computational Fluid Dynamics simulations. The power output of the shrouded rotor has been improved by a factor greater than 2.0. The detailed flow analysis results showed that there is a significant improvement in the performance of the wind turbine.

Design Cost and Scaling Model of Superconducting Wind Turbine Generator for Electricity Generation

2014 ◽  
Vol 564 ◽  
pp. 758-763
Author(s):  
N.A. Hamid ◽  
M.F. Suparin ◽  
T. Gokila ◽  
L.S. Ewe
Keyword(s):  
Wind Turbine ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Small Scale ◽  
Vertical Axis Wind Turbine ◽  
Turbine Generator ◽  
Wind Turbine Generator ◽  
Scaling Model ◽  
The Cost ◽  
Design Cost

This paper reports on the design cost and scaling model of a small scale superconducting wind turbine generator, where the levelized cost of energy (COE) was calculated. The proposed design of the wind turbine is based on the vertical axis wind turbine (VAWT) type that drives the superconducting generator. VAWT was chosen due to its ability to operate under low wind speed. Wind turbine using superconducting generator was proposed since it is able to enhance magnetic flux within the stator of the generator and consequently improve the performance of the generator. Once the design has been accomplished, all the cost of parts and components must be accounted and contributes to the overall cost of generating electrical energy from the superconducting wind turbine generator. The cost elements include the initial capital cost (ICC), balance of station (BOS), operation and maintenance (O&M), levelized replacement cost (LRC) and annual energy production (AEP). The calculated levelized COE shows that the cost of generating electricity using superconducting wind turbine generator is lower than generating electricity from conventional sources.

Vertical Axis Wind Turbine for Generation of Electricity through Highway Windmill

2015 ◽  
Vol 7 (02) ◽  
pp. 99-104 ◽  
Author(s):  
Shweta Singh ◽  
Sarita Singh
Keyword(s):  
Wind Turbine ◽  
Electromagnetic Induction ◽  
High Speed ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Night Time ◽  
Left Hand ◽  
The Cost ◽  
Very High

In this paper our effective approach is to harness electrical energy from the highway by using of vertical axis wind turbine. The smart windmill consists of a stationary shaft which is mounted on the ball bearing on the top and bottom end of the shaft The curvy darrieus blades are connected to the two ends of bearing which is able to rotate on its own axis. The dynamo is connected to the either upper part or lower part of the wind turbine which works on Fleming’s left hand rule of Electromagnetic induction. In highway both at day as well as at night time vehicles will be moving at very high speed. By this method the overall cost per unit of energy produces is less than the cost of new coal, natural gas and its installation. So the implementation can be made easier than any other methods.

scholarly journals A Review on the Evolution of Darrieus Vertical Axis Wind Turbine: Small Wind Turbines

2019 ◽  
Vol 07 (04) ◽  
pp. 27-44 ◽  
Author(s):  
Palanisamy Mohan Kumar ◽  
Krishnamoorthi Sivalingam ◽  
Srikanth Narasimalu ◽  
Teik-Cheng Lim ◽  
Seeram Ramakrishna ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Small Wind Turbines

scholarly journals Examination of Savonius VAWT Blade Made of Stainless Steel and Aluminum using Ansys

2020 ◽  
Vol 9 (3) ◽  
pp. 1370-1377
Keyword(s):  
Stainless Steel ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Modeling Software ◽  
Solid Works ◽  
The Cost ◽  
Aluminum Material ◽  
Ansys Workbench

This paper studies roof mounted savonius type Vertical Axis Wind Turbine systems with the goal of maximizing the efficiency and reducing the cost. The efficiency of the wind turbine depends on the material, shape and angle of the blade. So material plays an important role in the design of wind turbine. In this paper, Stainless Steel and Aluminum material are used to design savonius wind blades of 1 m height and 0.5 m chord length with 4 different arc radii. Modeling software Solid Works is used to model savonius wind blade and static structural and modal analysis of the Stainless Steel and Aluminum blades are done by using ANSYS Workbench software

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