scholarly journals Benefits of collocating vertical-axis and horizontal-axis wind turbines in large wind farms

Wind Energy ◽  
2016 ◽  
Vol 20 (1) ◽  
pp. 45-62 ◽  
Author(s):  
Shengbai Xie ◽  
Cristina L. Archer ◽  
Niranjan Ghaisas ◽  
Charles Meneveau
Keyword(s):  
Wind Turbines ◽  
Wind Farms ◽  
Vertical Axis ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbines ◽  
Large Wind

Development and Application of a Simulation Tool for Vertical and Horizontal Axis Wind Turbines

2013 ◽  
Author(s):  
David Marten ◽  
Juliane Wendler ◽  
Georgios Pechlivanoglou ◽  
Christian Navid Nayeri ◽  
Christian Oliver Paschereit
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Vertical Axis ◽  
Turbine Rotor ◽  
Horizontal Axis ◽  
Vertical Axis Wind Turbine ◽  
First Case ◽  
Horizontal Axis Wind Turbines ◽  
Lift And Drag ◽  
The Impact

A double-multiple-streamtube vertical axis wind turbine simulation and design module has been integrated within the open-source wind turbine simulator QBlade. QBlade also contains the XFOIL airfoil analysis functionalities, which makes the software a single tool that comprises all functionality needed for the design and simulation of vertical or horizontal axis wind turbines. The functionality includes two dimensional airfoil design and analysis, lift and drag polar extrapolation, rotor blade design and wind turbine performance simulation. The QBlade software also inherits a generator module, pitch and rotational speed controllers, geometry export functionality and the simulation of rotor characteristics maps. Besides that, QBlade serves as a tool to compare different blade designs and their performance and to thoroughly investigate the distribution of all relevant variables along the rotor in an included post processor. The benefits of this code will be illustrated with two different case studies. The first case deals with the effect of stall delaying vortex generators on a vertical axis wind turbine rotor. The second case outlines the impact of helical blades and blade number on the time varying loads of a vertical axis wind turbine.

scholarly journals Modified Design of Savonius Wind Turbine Blade for Performance Improvement

2019 ◽  
Vol 9 (1) ◽  
pp. 1432-1437
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
New Technologies ◽  
Vertical Axis ◽  
Horizontal Axis ◽  
Wind Speeds ◽  
Wind Potential ◽  
Horizontal Axis Wind Turbines ◽  
Savonius Wind Turbine ◽  
Low Performance

In the context of worldwide energetic transition, wind energy shows up as one of the most prominent renewable energy to provide an alternative for the conventional energy source. Therefore, new technologies of a wind turbine are developed, horizontal axis wind turbines have been extensively investigated and evolved. However, the development of vertical axis wind turbines is still an open and area of research, The main objective is to develop a more efficient type of wind turbines able to operate at low wind speeds to take hold maximum wind potential, The Savonius rotor goes with such conditions, however, it faces critical drawbacks, in particular, the low performance in comparison with horizontal axis wind turbines, as well, the blade in return of savonius wind turbine generates a negative torque leading to a decrement of turbine performance. The present work aims to investigate a modified model of the conventional Savonius rotors with a focus on improving the coefficient of power, transient computational fluid dynamics (CFD) simulations are carried out in an effort to perform a validation of numerical results according to experimental data, also to conduct a comparative analysis of both savonius models

STATE OF THE ART OF SMALL WIND ENERGY ANALYSING DIFFERENT CONTROLS

10.6036/10376 ◽  
2022 ◽  
Vol 97 (1) ◽  
pp. 11-11
Author(s):  
MARLON GALLO TORRES ◽  
ENEKO MOLA SANZ ◽  
IGNACIO MUGURUZA FERNANDEZ DE VALDERRAMA ◽  
AITZOL UGARTEMENDIA ITURRIZAR ◽  
GONZALO ABAD BIAIN ◽  
...  
Keyword(s):  
Wind Turbines ◽  
State Of The Art ◽  
Vertical Axis ◽  
Energy Conversion Efficiency ◽  
Horizontal Axis ◽  
Prevailing Wind ◽  
Vertical Axis Wind Turbines ◽  
Axis Of Rotation ◽  
Horizontal Axis Wind Turbines ◽  
Installation Cost

There are two wind turbine topologies according to the axis of rotation: horizontal axis, "Horizontal Axis Wind Turbines" (HAWT) and vertical axis, "Vertical Axis Wind Turbines" (VAWT) [2]. HAWT turbines are used for high power generation as they have a higher energy conversion efficiency [2]. However, VAWTs are used in mini wind applications because they do not need to be oriented to the prevailing wind and have lower installation cost.

scholarly journals ANALYSIS OF THE COMPETITIVENESS INCREASE OF ENERGY-EFFICIENT DESIGNS OF WIND TURBINES OF VARIOUS TYPES

2017 ◽  
pp. 42-50 ◽  
Author(s):  
Roman Albertovich Ilyin ◽  
Nickolai Dmitrievich Shishkin
Keyword(s):  
Wind Turbines ◽  
Power Supply ◽  
Wind Farms ◽  
Vertical Axis ◽  
Payback Period ◽  
Capital Investments ◽  
Horizontal Axis Wind Turbines ◽  
The Cost ◽  
Supply Systems ◽  
Specific Capital

The structural analysis of wind turbines (WT) shows that along with horizontal-axis wind turbines (HAWT) there are now widely used vertical-axis wind turbines (VAWT). Significant advantages of the combined type VAWT on the basis of wind turbines of Darrieus and Savonius make them most promising for further improvement and wide application. Power of the wind turbine depends on the angle of the vector of the wind flow to the axis of rotation of the wind motor. The presence of control systems makes the wind turbines HAWT "slow" because of long reaction. As a result, the utilization of wind energy of the powerful HAWT can be reduced to 0.15-0.25 and become lower than that of VAWT, amounting to 0.20-0.40. Calculations show that the payback period of wind turbines increases from 2 to 50 years, with the increase of specific capital investments in wind turbines from 25 000 RUB/kW to 150 000 RUB/kW (from 417 up to 2500 $/kW), reducing the cost of the displaced electricity from 2.0 RUB/kW·h to 5.0 RUB/kW·h. Specific capital investments in wind turbines with a payback period of 7.0 years should not exceed 53 000 RUB/kW (884 $/kW). It seems quite reasonable to use HAWT and VAWT of the big capacity to create wind farms connected to a centralized grid. HAWT and VAWT with capacity up to 30 kW can be used for autonomous power supply of objects remoted from the centralized power supply systems.

scholarly journals An Aerodynamic Method for the Analysis of Isolated Horizontal-Axis Wind Turbines

1997 ◽  
Vol 3 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Christian Masson ◽  
Idriss Ammara ◽  
Ion Paraschivoiu
Keyword(s):  
Wind Turbines ◽  
Wind Farm ◽  
Stokes Equations ◽  
Control Volume ◽  
Wind Farms ◽  
Horizontal Axis ◽  
Research Activities ◽  
Performance Predictions ◽  
Strip Theory ◽  
Horizontal Axis Wind Turbines

The aerodynamic analysis of a wind turbine represents a very complex task since it involves an unsteady three-dimensional viscous flow. In most existing performance-analysis methods, wind turbines are considered isolated so that interference effects caused by other rotors or by the site topology are neglected. Studying these effects in order to optimize the arrangement and the positioning of Horizontal-Axis Wind Turbines (HAWTs) on a wind farm is one of the research activities of the Bombardier Aeronautical Chair. As a preliminary step in the progress of this project, a method that includes some of the essential ingredients for the analysis of wind farms has been developed and is presented in the paper. In this proposed method, the flow field around isolated HAWTs is predicted by solving the steady-state, incompressible, two-dimensional axisymmetric Navier-Stokes equations. The turbine is represented by a distribution of momentum sources. The resulting governing equations are solved using a Control-Volume Finite Element Method (CVFEM). This axisymmetric implementation efficiently illustrates the applicability and viability of the proposed methodology, by using a formulation that necessitates a minimum of computer resources. The axisymmetric method produces performance predictions for isolated machines with the same level of accuracy than the well-known momentum-strip theory. It can therefore be considered to be a useful tool for the design of HAWTs. Its main advantage, however, is its capacity to predict the flow in the wake which constitutes one of the essential features needed for the performance predictions of wind farms of dense cluster arrangements.

Aerodynamics of horizontal axis wind turbines and wind farms

2019 ◽  
pp. 431-461
Author(s):  
Dan Zhao ◽  
Nuomin Han ◽  
Ernest Goh ◽  
John Cater ◽  
Arne Reinecke
Keyword(s):  
Wind Turbines ◽  
Wind Farms ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbines

Predictions of Low-Frequency and Impulsive Sound Radiation From Horizontal-Axis Wind Turbines

1982 ◽  
Vol 104 (2) ◽  
pp. 124-130 ◽  
Author(s):  
R. Martinez ◽  
S. E. Widnall ◽  
W. L. Harris
Keyword(s):  
Wind Turbines ◽  
Low Frequency ◽  
Theoretical Models ◽  
Horizontal Axis ◽  
Time Signals ◽  
Horizontal Axis Wind Turbines ◽  
Acoustic Output ◽  
Blade Loads ◽  
Large Wind ◽  
Good Agreement

This paper develops theoretical models to predict the radiation of low-frequency and impulsive sound from horizontal-axis wind turbines due to three sources: (i) steady blade loads, (ii) unsteady blade loads due to operation in a ground shear, (iii) unsteady loads felt by the blades as they cross the tower wake. These models are then used to predict the acoustic output of MOD-I, the large wind turbine operated near Boone, N. C. Predicted acoustic time signals are compared to those actually measured near MOD-I; good agreement is obtained.

scholarly journals Flow Characteristics of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6281
Author(s):  
Jia Guo ◽  
Liping Lei
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Wind Farm ◽  
Flow Characteristics ◽  
Wind Farms ◽  
Vertical Axis ◽  
Incline Angle ◽  
Vertical Axis Wind Turbine ◽  
Unsteady Wake ◽  
Horizontal Axis Wind Turbines

Currently, vertical axis wind turbines (VAWT) are considered as an alternative technology to horizontal axis wind turbines in specific wind conditions, such as offshore farms. However, complex unsteady wake structures of VAWTs exert a significant influence on performance of wind turbines and wind farms. In the present study, instantaneous flow fields around and downstream of an innovative VAWT with inclined pitch axes are simulated by an actuator line model. Unsteady flow characteristics around the wind turbine with variations of azimuthal angles are discussed. Several fluid parameters are then evaluated on horizontal and vertical planes under conditions of various fold angles and incline angles. Results show that the total estimated wind energy in the shadow of the wind turbine with an incline angle of 30° and 150° is 4.6% higher than that with an incline angle of 90°. In this way, appropriate arrangements of wind turbines with various incline angles have the potential to obtain more power output in a wind farm.

Sign in / Sign up

Export Citation Format

Share Document