Optimisation of vertical axis wind turbine: CFD simulations and experimental measurements

2011 ◽  
Vol 90 (5) ◽  
pp. 1186-1201 ◽  
Author(s):  
Swapnil V. Ghatage ◽  
Jyeshtharaj B. Joshi
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Experimental Measurements ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations

Study on aerodynamic performance of a straight-bladed Vertical Axis Wind Turbine by CFD simulations

2017 ◽  
Vol 2017 (0) ◽  
pp. J0540301
Author(s):  
Takuji KASUYA ◽  
Takao MAEDA ◽  
Yasunari KAMADA ◽  
Keiichiro KAWAI ◽  
Yuhei HOSHINO
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Aerodynamic Performance ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations

scholarly journals CFD simulations of power coefficients for an innovative Darrieus style vertical axis wind turbine with auxiliary straight blades

2017 ◽  
Vol 923 ◽  
pp. 012036 ◽  
Author(s):  
F Arpino ◽  
G Cortellessa ◽  
M Dell’Isola ◽  
M Scungio ◽  
V Focanti ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations

scholarly journals Effect of solidity on the dynamic behaviour of the Darrieus turbine with leading-edge protuberance

2021 ◽  
Vol 850 (1) ◽  
pp. 012038
Author(s):  
U Lokesh ◽  
N Kirthika ◽  
K Madhu Madhan ◽  
C B Maheswaran ◽  
S Ramaswami ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Dynamic Behaviour ◽  
Leading Edge ◽  
Vertical Axis ◽  
Speed Ratio ◽  
Experimental Measurements ◽  
Vertical Axis Wind Turbine ◽  
Tip Speed Ratio ◽  
Vortex Induced Vibrations

Abstract The dynamic behaviour of the straight–type Darrieus turbine with leading-edge protuberance (LEP) was analysed under various solidity ratios at several tip speed ratios through experiments. The Darrieus turbine is a type of Vertical Axis Wind Turbine (VAWT) which uses wind energy to generate electricity. This type of turbine was subjected to vortex-induced and buffeting types of vibrations. These vibrations were more sensitive to the number of blades and tip speed ratios. Based on the experimental measurements, the results revealed that, at a low tip speed ratio, the four-bladed turbine exhibits lesser vortex-induced vibrations than those of the three and five-bladed turbines. However, at a high tip speed ratio, the three-bladed configuration operates well against the vortex-induced vibrations. In the case of buffeting, a three-bladed turbine diminishes the dynamic oscillations at both low and high tip speed ratios, whereas the four and five-bladed turbines induce dynamic oscillations at slightly higher amplitudes. However, the amplitude of buffeting is smaller than those of vortex-induced vibrations.

scholarly journals The influence of the number of rotor blades on the performance of orthopter wind turbine

2018 ◽  
Vol 197 ◽  
pp. 08008
Author(s):  
Rachmat Firdaus ◽  
Takahiro Kiwata ◽  
Koji Nagao ◽  
Takaaki Kono
Keyword(s):  
Numerical Simulation ◽  
Wind Turbine ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Two Dimensional ◽  
Main Rotor ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
A Chain ◽  
Good Agreement

This paper describes the influence of the number of rotor blades the performance of the orthopter wind turbine. The orthopter wind turbine is combination between a drag-type and a lift-type vertical axis wind turbine which each blade combines a rotating movement around its own axis and a rotating movement around turbine's axis. In this case, the pitch of the blades was controlled by using a chain and sprockets arrangement to ensure that the blades rotated around their own axis by 360 degrees during the each two full revolution of the main rotor. To improve the performance of this wind turbine, the number of blades, was investigated by wind tunnel. By conducting two-dimensional unsteady CFD simulations, the power and torque of the vertical axis wind turbine and the flow around blades were also analyzed. The numerical simulation by using turbulence model predicted good agreement of the performance with experiment qualitatively.

scholarly journals A Numerical Study on a Vertical-Axis Wind Turbine with Inclined Arms

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Agostino De Marco ◽  
Domenico P. Coiro ◽  
Domenico Cucco ◽  
Fabrizio Nicolosi
Keyword(s):  
Wind Turbine ◽  
Cross Sections ◽  
Numerical Study ◽  
Vertical Axis ◽  
Analytical Models ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Power Extraction ◽  
Role Of Principal

This work focuses on a particular type of vertical-axis wind turbine, in which a number of inclined arms with airfoil-shaped cross-sections are mounted to connect the principal blades to their hub. While the majority of the known studies on vertical-axis turbines is devoted to the role of principal blades, in most of the cases without taking into account other parts of the wind turbine, the objective of this work is to investigate the effect of uncommon arm geometries, such as the inclined arms. The inclined arms are known to have a potentially beneficial role in the power extraction from the wind current but, due to the complexity of the phenomena, the investigation on aerodynamics of this type of turbine is often impossible through analytical models, such as blade-element momentum theory. It turns out that adequate studies can only be carried out by wind tunnel experiments or CFD simulations. This work presents a methodical CFD study on how inclined arms can be used on a selected wind turbine configuration to harvest additional power from the wind. The turbine configuration, geometry, and some fundamental definitions are introduced first. Then an in-depth CFD analysis is presented and discussed.

scholarly journals Numerical Investigation on the Effects of Varying the Arc length of a Windshield on the Performance of a Highway Installed Banki Wind Turbine

Fluids ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 285
Author(s):  
Ian Jay T. Matias ◽  
Louis Angelo M. Danao ◽  
Binoe E. Abuan
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Navier Stokes ◽  
Arc Length ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Worst Case ◽  
Car Model ◽  
Negative Effect ◽  
Computational Fluid Dynamics Cfd

Two-dimensional computational fluid dynamics (CFD) simulations are employed to investigate the effects of adding a circular-arc-shaped windshield on the performance of a Banki type vertical axis wind turbine (VAWT), particularly to the application where the VAWT is harnessing wind energy in highway caused by the passing vehicles. Unsteady Reynolds-Averaged Navier-Stokes (URANS) is the computational approach used to calculate the turbulent flow within the domain. Two sets of simulation cases based on two different vehicles (i.e., car and a bus) are performed with varying arc-length of the windshield. The results show that the windshield provides an increase in the energy captured by the VAWT by up to 16.14% compared to no windshield case when the car model is used. In contrast, windshield in all the simulation cases using a bus model gives a negative effect to VAWT performance where the worst case yields −64.77%.

scholarly journals CFD analysis on the influence of angle of attack on vertical axis wind turbine aerodynamics

2021 ◽  
Vol 850 (1) ◽  
pp. 012027
Author(s):  
Prateek Srivastava ◽  
Sachin Kansal ◽  
Ashish Talwalkar ◽  
R Harish
Keyword(s):  
Wind Turbine ◽  
Angle Of Attack ◽  
Vertical Axis ◽  
Cfd Analysis ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Wind Turbine Aerodynamics ◽  
Fluent Software ◽  
Overall Performance

Abstract The Angle of Attack (AOA) in a Vertical Axis Wind Turbine (VAWT) plays an important role in determining the forces and the power generated by the wind turbine. It is difficult to find the suitable AOA due to the complex and constantly changing wind flow patterns. In this paper, we have performed CFD simulations using Ansys Fluent software, based on the constantly changing AOA. The CFD simulations were conducted by selecting a suitable range of AOA and the velocity of the wind. The selected range of AOA varied from 5 degrees to 25 degrees with increments of 5 degrees and the range of the air velocities varied from 7m/s to 21m/s with increments of 7m/s. The tests were also performed using the X-Foil software. The results obtained from the CFD simulations, done by using the Ansys Fluent Software and from the X-Foil software, were then compared to give a more accurate and optimized AOA and velocity value. This optimization of the AOA could enhance the overall performance of the Vertical Axis Wind turbine.

Calculating the aerodynamics of vertical axis wind turbines

2012 ◽  
Vol 34 (3) ◽  
pp. 169-184 ◽  
Author(s):  
Hoang Thi Bich Ngoc
Keyword(s):  
Wind Turbine ◽  
Incidence Angle ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Velocity Triangle ◽  
Relationship Of ◽  
The Relationship

Vertical axis wind turbine technology has been applied last years, very long after horizontal axis wind turbine technology. Aerodynamic problems of vertical axis wind machines are discussible. An important problem is the determination of the incidence law in the interaction between wind and rotor blades. The focus of the work is to establish equations of the incidence depending on the blade azimuth, and to solve them. From these results, aerodynamic torques and power can be calculated. The incidence angle is a parameter of velocity triangle, and both the factors depend not only on the blade azimuth but also on the ratio of rotational speed and horizontal speed. The built computational program allows theoretically selecting the relationship of geometric parameters of wind turbine in accordance with requirements on power, wind speed and installation conditions.

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