Optimization of a Flanged DAWT Using a CFD Actuator Disc Method

Ranjbar, Mohammad Hassan; Nasrazadani, Seyyed Abolfazl; Gharali, Kobra

doi:10.1007/978-3-319-99719-3_20

Cited by 6 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For solving full-elliptic Navier-Stokes equations, k-ε and k-ω models were used. According to the previous studies [18,19,34], these two models can provide reliable results for flows around a rotor located in a duct. Two models were tested, and the k-ω model was selected [35].…”

Section: Geometry and Numerical Approach Of Duct Studymentioning

confidence: 85%

“…In the study by Rochman et al [17], only the geometry of the flange of the duct was examined, which showed that adding a flat flange at the end of the duct causes an increase of 29% of wind speed in the throat region of the duct in comparison to the case without a flange. The studies of Ranjbar et al [18] and Al-Zahabi et al [19] focused only on the angle of a flange. Al-Zahabi et al showed that, for their selected geometry, by setting the angle of the flange at 15 degrees, the power coefficient can be increased up to 5%.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct

et al. 2021

Self Cite

View full text Add to dashboard Cite

Efforts to increase the power output of wind turbines include Diffuser Augmented Wind Turbines (DAWT) or a shroud for the rotor of a wind turbine. The selected duct has three main components: a nozzle, a diffuser, and a flange. The combined effect of these components results in enriched upstream velocity for the rotor installed in the throat of the duct. To obtain the maximum velocity in the throat of the duct, the optimum angles of the three parts have been analyzed. A code was developed to allow all the numerical steps including changing the geometries, generating the meshes, and setting up the numerical solver simultaneously. Finally, the optimum geometry of the duct has been established that allows a doubling of the flow velocity. The flow characteristics inside the duct have also been analyzed in detail. An H-Darrieus Vertical Axis Wind Turbine (VAWT) has been simulated inside the optimized duct. The results show that the power coefficient of the DAWT can be enhanced up to 2.9 times. Deep dynamic stall phenomena are captured perfectly. The duct advances the leading-edge vortex generation and delays the vortex separation.

show abstract

Section: Geometry and Numerical Approach Of Duct Studymentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…This technique has been widely applied and validated in different studies focused on the design of new models of ducted wind turbines [65][66][67][68][69]. With this aim, the Reynolds-Averaged Navier-Stokes (RANS) equations along with the k-ε turbulence model were solved by applying the finite-volume method [70][71][72]. Enhanced wall functions were used to model the airflow behaviour in the air region close to the solid surfaces.…”

Section: B Numerical Analysis Of the Patented Device Using Femmentioning

confidence: 99%

New System for the Acceleration of the Airflow in Wind Turbines

Alonso-Estébanez

Pascual-Muñoz

Rabanal

et al. 2019

MENG

View full text Add to dashboard Cite

Background: This patent is based on the wind industry technology called Diffuser Augmented Wind Turbines (DAWTs). This technology consists of a horizontal axis wind turbine, which is housed inside a duct with diverging section in the direction of the free air stream. In this paper, a review of preceding patents related to this technology is carried out. Objective: This paper presents an innovative patent to improve the performance of horizontal axis wind turbines. In particular, this system is aimed at improving the performance of those turbines that otherwise might not be installed due to the low wind resource existing at certain locations. Methods: The most innovative elements of this patent are: (1) the semi-spherical grooves, which are mechanized on the surface of the two diffusers in order to guarantee a more energetic boundary layer; (2) the coaxial diffuser, which is located downwind following the first diffuser in order to increase the suction effect on the air mass close to the inlet; (3) the coaxial rings located around the first diffuser outlet, which are used to deflect the external airflow toward the turbine wake; and (4), the selforientating system to orientate the system by the prevailing wind direction. Results: An application of the patent for increasing the power generated by a horizontal axis wind turbine with three blades is presented. The patent is designed and its performance is evaluated by using a Computational Fluid Dynamics code. The numerical results show that this system rises the airflow going through the rotor of the turbine. Conclusion: The patented device is an original contribution aimed at enabling a more profitable installation of wind turbines in places where the wind resource is insufficient because of the wind shear caused both by the proximity of the earth and the obstacles on the earth surface.

show abstract

“…20 A flange added at the end of the shroud leads to an increase in the low back pressure of the shrouded turbine structure due to the formation of a strong vortex. 21,22 Also, as the last part of a shroud, a flange moves the maximum power coefficient toward large TSRs. 20,23 The length and angle of shrouds have been studied in other works.…”

Section: Introductionmentioning

confidence: 99%

Optimized configuration with economic evaluation for shrouded vertical axis wind turbines applicable for urban structures

Rafiei,

Gharali,

Soltani

2023

Energy Science & Engineering

Self Cite

View full text Add to dashboard Cite

In recent urban buildings, there is an interest in using wind turbines inside the buildings. Thus, the rotors of wind turbines are shrouded by the walls of the buildings. A design for using wind turbines in urban areas is to use shrouded turbines on the roof of a building. Since vertical axis wind turbines (VAWTs) with low environmental impacts are recommended for energy supply in urban areas, here, the interaction of two shrouded VAWTs has been studied numerically. Based on the effects of different shroud parts, the diffuser‐shrouded turbines are selected. The arrangement of diffuser‐shrouded VAWTs has been optimized using the response surface method optimization with the Kriging model. The optimization samples are chosen by the design of experiment method to reduce the number of simulations and increase optimization accuracy. The total power coefficient of the optimized cluster is 46.2% higher than the sum of the same individual diffuser‐shrouded turbines and 149.6% higher than the sum of individual bare VAWTs. The economic assessment shows that the levelized cost of energy of the optimized cluster of two diffuser‐shrouded VAWTs is reduced by about 40% compared to two bare VAWTs.

show abstract

Optimization of a Flanged DAWT Using a CFD Actuator Disc Method

Cited by 6 publications

References 12 publications

Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct

Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct

New System for the Acceleration of the Airflow in Wind Turbines

Optimized configuration with economic evaluation for shrouded vertical axis wind turbines applicable for urban structures

Contact Info

Product

Resources

About