Aerodynamic performance analysis of slotted airfoils for application to wind turbine blades

Belamadi, Riyadh; Djemili, Abdelouaheb; Ilinca, Adrian; Mdouki, Ramzi

doi:10.1016/j.jweia.2016.01.011

Cited by 100 publications

(48 citation statements)

References 18 publications

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“…However, at larger attack angles the lift force increases and the drag force decreases significantly. Belamadi et al (2016) have also found that, the passive control system using VG improves aerodynamic performance only over a specific range of attack angles. studied the flow control using a new vortex generators shape with counter-rotating vortices, obtained by modifying a configuration already investigated.…”

Section: Introductionmentioning

confidence: 88%

Aerodynamic performances improvement of NACA 4415 profile by passive flow control using vortex generators

Hares¹,

Mébarki²,

Brioua³

et al. 2019

JSSCM

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Improvement of the airfoil NACA 4415 aerodynamic performances by flow control using a passive technique was achieved in this study. Gothic-shaped vortex generators were added at the profile upper surface. Vortex Generators (VG) were used to avoid boundary layer separation at the profile trailing edge, thus reducing the drag force and improving aerodynamic performances. A numerical simulation with fluent code was performed. A parametric study was carried out to determine optimal disposition and dimensions of the VG. Six VG parameters were tested; thickness (E), height (H), length (L), aspect ratio (r), incidence angle (α) and the VG position relative to the chord of the profile (XVG). The results show an increase in the lift coefficient for the profile with vortex generators in the range of high attack angles. Optimal dimensions and positions of the VG were obtained.

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Section: Introductionmentioning

confidence: 88%

Aerodynamic performances improvement of NACA 4415 profile by passive flow control using vortex generators

Hares¹,

Mébarki²,

Brioua³

et al. 2019

JSSCM

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“…Rib-let partially covering the wind turbine blade, Chamorro et al [169]. Another passive flow control technique using slotted airfoils, as shown in Figure 17, has been studied by Belamadi et al [170]. A 2D CFD analysis was carried out to study the effect of location width and slope of the slot on the separation.…”

Section: Passive Flow Control Techniquesmentioning

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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“…Therefore, the application of suitable control technique to mitigate or delete the LSBs and avoid their noxious effect is necessary. The passive control technique via slots applied by the author on both compressor blades and wind turbine airfoils in works [2], [3] is proposed in the current study with a novel form and is aimed for the control of LSB developed on the suction side of the thick symmetric NACA0021 airfoil.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Long Separation Bubble on Slotted Thick Airfoil

Mdouki

2018

Proc Appl Math and Mech

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Larbi Tebessi, Route de constantine 12002 TebessaThis work is aimed to examine the potential of two types of slots to control the long laminar separation bubble LoSB developed on the suction side of the thick symmetric NACA0021 airfoil. Two dimensional simulations are carried out under steady state and incompressible regime with the correlation-based intermittency turbulent model in order to predict the boundary layer transition aspect. Two slots are included separately in the airfoil and are proposed as a passive tool to manipulate the LoSB under the effect of pressure gradient between both high and low pressurized zones. The results without control are confronted with experimental data and give a good validation. Concerning the controlled configurations, the transversal slot fails to manipulate the LoSB, while the longitudinal slot reveals its positive potential to control the LoSB and therefore enhancing the lift coefficient of the airfoil and the length of the SB, however, the drag coefficient was increased.

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Aerodynamic performance analysis of slotted airfoils for application to wind turbine blades

Cited by 100 publications

References 18 publications

Aerodynamic performances improvement of NACA 4415 profile by passive flow control using vortex generators

Aerodynamic performances improvement of NACA 4415 profile by passive flow control using vortex generators

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

Numerical Study of Long Separation Bubble on Slotted Thick Airfoil

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