Flow Control Devices for Wind Turbines

Aramendia, Iñigo; Fernandez-Gamiz, Unai; Ramos-Hernanz, José Antonio; Sancho, Javier Antón; López-Guede, José Manuel; Zulueta, Ekaitz

doi:10.1007/978-3-319-49875-1_21

Cited by 48 publications

(37 citation statements)

References 23 publications

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“…According to Aramendia et al [3,4] and Fernandez-Gamiz et al [5], either the use of passive controllers (vortex generators (VGs), microtabs, spoilers, etc.) or active controllers (trailing-edge flaps, synthetic jets and air jet vortex generators) can be introduced.…”

Section: Introductionmentioning

confidence: 99%

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

et al. 2018

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Vortex generators (VGs) are increasingly used in the wind turbine manufacture industry as flow control devices to improve rotor blade aerodynamic performance. Nevertheless, VGs may produce excess residual drag in some applications. The so-called sub-boundary layer VGs can provide an effective flow-separation control with lower drag than the conventional VGs. The main objective of this study is to investigate how well the simulations can reproduce the physics of the flow of the primary vortex generated by rectangular sub-boundary layer VGs mounted on a flat plate with a negligible pressure gradient with an angle of attack of the vane to the oncoming flow of β = 18 • . Three devices with aspect ratio values of 2, 2.5 and 3 are qualitatively and quantitatively compared. To that end, computational simulations have been carried out using the RANS (Reynolds averaged Navier-Stokes) method and at Reynolds number Re = 2600 based on the boundary layer momentum thickness θ at the VG position. The computational results show good agreement with the experimental data provided by the Advanced Aerodynamic Tools of Large Rotors (AVATAR) European project for the development and validation of aerodynamic models. Finally, the results indicate that the highest VG seems to be more suitable for separation control applications.

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Section: Introductionmentioning

confidence: 99%

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

et al. 2018

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“…They are also used to control the boundary layer separation and transition characteristics Bons et al [86] and Gul et al [87]. Aramendia et al [88,89] provided a comprehensive overview about available knowledge, references and investigations on the active and passive flow control devices, initially developed for aeronautic industry which are currently being investigated and used in wind turbine industry. Passive techniques allow improving the performance of the wind turbines without external energy expenditure whereas active techniques require external energy for their activation.…”

Section: Experimental Approach To Blade Design and Analysismentioning

confidence: 99%

“…Passive techniques allow improving the performance of the wind turbines without external energy expenditure whereas active techniques require external energy for their activation. There are many such devices and some of the most important (Vortex Generators, Microtabs, Spoilers, Fences, Serrated trailing edge) and actives devices (Trailing edge flaps, Air Jet Vortex Generators, Synthetic Jets) have been compiled in this review, Aramendia et al [88,89].…”

Section: Experimental Approach To Blade Design and Analysismentioning

confidence: 99%

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

et al. 2018

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Among renewable sources of energy, wind is the most widely used resource due to its commercial acceptance, low cost and ease of operation and maintenance, relatively much less time for its realization from concept till operation, creation of new jobs, and least adverse effect on the environment. The fast technological development in the wind industry and availability of multi megawatt sized horizontal axis wind turbines has further led the promotion of wind power utilization globally. It is a well-known fact that the wind speed increases with height and hence the energy output. However, one cannot go above a certain height due to structural and other issues. Hence other attempts need to be made to increase the efficiency of the wind turbines, maintaining the hub heights to acceptable and controllable limits. The efficiency of the wind turbines or the energy output can be increased by reducing the cut-in-speed and/or the rated-speed by modifying and redesigning the blades. The problem is tackled by identifying the optimization parameters such as annual energy yield, power coefficient, energy cost, blade mass, and blade design constraints such as physical, geometric, and aerodynamic. The present paper provides an overview of the commonly used models, techniques, tools and experimental approaches applied to increase the efficiency of the wind turbines. In the present review work, particular emphasis is made on approaches used to design wind turbine blades both experimental and numerical, methodologies used to study the performance of wind turbines both experimentally and analytically, active and passive techniques used to enhance the power output from wind turbines, reduction in cut-in-speed for improved wind turbine performance, and lastly the research and development work related to new and efficient materials for the wind turbines.

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“…Flow control devices can be categorized as active or passive; this classification depends on their operating principle, see Aramendia et al [2,3] and Barlas et al [4]. Passive control techniques would represent an improvement in turbine efficiency and load reduction without external energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Computational Characterization of a Rectangular Vortex Generator on a Flat Plate for Different Vane Heights and Angles

et al. 2019

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Vortex generators (VG) are passive flow control devices used for avoiding or delaying the separation of the boundary layer by bringing momentum from the higher layers of the fluid towards the surface. The Vortex generator usually has the same height as the local boundary layer thickness, and these Vortex generators can produce overload drag in some cases. The aim of the present study was to analyze the characteristics and path of the primary vortex produced by a single rectangular vortex generator on a flat plate for the incident angles of β = 10 • , 15 • , 18 • and 20 • . A parametric study of the induced vortex was performed for six VG heights using Reynolds average Navier-Stokes equations at Reynodls number Re = 27,000 based on the local boundary layer thickness, using computational fluid dynamics techniques with OpenFOAM open-source code. In order to determine the vortex size, the so-called half-life radius was computed and compared with experimental data. The results showed a similar trend for all the studied vortex generator heights and incident angles with small variations for the vertical and the lateral paths. Additionally, 0.4H and 0.6H VG heights at incident angles of β = 18 • and β = 20 • showed the best performance in terms of vortex strength and generation of wall shear stress.

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Flow Control Devices for Wind Turbines

Cited by 48 publications

References 23 publications

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

Computational Characterization of a Rectangular Vortex Generator on a Flat Plate for Different Vane Heights and Angles

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