Flow control for the vertical axis wind turbine by means of flapping flexible foils

Bouzaher, Mohamed Taher; Hadid, Mohamed; Derfouf, Semcheddine

doi:10.1007/s40430-016-0618-3

Cited by 22 publications

(6 citation statements)

References 19 publications

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“…The present paper proposes an actively deformable flexible blade to improve the vertical axis tidal turbine efficiency. To the best of the authors' knowledge, the major difference between the present work and our relevant works [4][5] is the blade deformation mode. The effects of flexible trailing edge and flexible leading edge are exposed in the previous works where the present work is devoted to highlight the camber deformation effects.…”

Section: Introductionmentioning

confidence: 77%

Impact of flexible blades on the vertical axis tidal turbine performances

Drias¹,

Bouzaher²,

lalmi³

et al. 2018

MMC_B

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Previous research on the vertical axis turbines efficiency has used blades with a typical static camber to improve the turbines efficiency. Typically, the static camber increases the drag force, which affects negatively the optimal harvesting of energy. The present study proposes deformable blades that change their shape relative to their angular position. The new blade shape is achieved by deforming the airfoil camber line via a sinusoidal rounded arc. The computed results show that the present type of deformation involves two typical flow control mechanisms. Firstly, a leading edge control that alters the flow angle of attacks and therefore the leading edge vortex (LEV) time of growth. Secondly, this type of deformation comprises a trailing edge control that affects the physical size and strength of the LEV. The lift force can be effectively increased. As a main result, the turbine power coefficient appears to be higher by about 20% for the optimal operating conditions.

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Section: Introductionmentioning

confidence: 77%

Impact of flexible blades on the vertical axis tidal turbine performances

Drias¹,

Bouzaher²,

lalmi³

et al. 2018

MMC_B

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“…HAWTs generate the bulk of the electricity (Kumar et al 2018) due to their higher efficiency compared to VAWTs. Upscaling, maintenance, and installation of VAWT are nevertheless less challenging than those of HAWT (Abdalrahman et al 2017;Bouzaher et al 2017;V. Kumar et al 2018;Rezaeiha et al 2017;Wang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Electric vehicle battery charging framework using artificial intelligence modeling of a small wind turbine based on experimental characterization

Aboelezz

Makeen

Ghali

et al. 2022

Clean Techn Environ Policy

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The objective of this paper is to develop a generic electric vehicle battery charging framework using wind energy as the direct energy source. A robust model for a small vertical axis wind turbine based on an artificial neural network algorithm is used for predicting its performance over a wide range of operating conditions. The proposed framework can be implemented at any location worldwide where full prediction of the wind signature is perfectly obtained. In this paper, a small vertical axis wind turbine has been experimentally characterized at different operating conditions, where measured data, output power, and torque have been used to build the model. Once the model has been developed, the model is inserted into the MATLAB/Simulink software tool to predict the charging performance of a battery for an electric vehicle. An rpm controller has been used to achieve the maximum generated power from the wind turbine across the day with various wind speeds. Hence, the generated power is fed to the EV battery charger to implement the constant current constant voltage charging protocol. The charging current reached the desired value in a settling time of 4.5 s, whatever the intermittency of the wind energy. The proposed application of wind energy to EV provides sufficient constant power supported by the utility grid. Graphical Abstract

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“…Although several active flow control techniques have been explored over the past decades [14][15][16][17], trailing-edge flaps (TEFs) are still one of the most promising devices in the aerial applications or wind turbine industry due to its cost-effectiveness and viability [18,19]. The application of a TEF as an active control technique in unsteady aerodynamics is inspired by the conventional application of the rigid and discrete flaps installed at the trailing edge of aircraft wings or helicopter blades.…”

Section: Introductionmentioning

confidence: 99%

The influence of oscillating trailing-edge flap on the dynamic stall control of a pitching wind turbine airfoil

Seyednia

Masdari

Vakilipour

2019

J Braz. Soc. Mech. Sci. Eng.

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Unsteady operating environment of a horizontal axis wind turbine can induce excessive loads on the blades, originating from rapid variations in angle of attack and consequently dynamic stall (DS) occurrence. Therefore, it is of utmost importance to control the flow around a blade by which fatigue damage is likely to happen. Using two-dimensional incompressible unsteady Reynolds-averaged Navier-Stokes equations in OpenFOAM package, a series of simulations are carried out to assess the viability of an oscillating deformable trailing-edge flap (DTEF) in load and DS control on a pitching wind turbine airfoil which experiences deep DS at Re = 420,000. Results reveal whether or not the airfoil is equipped with an oscillating DTEF, DS vortex forms at high angles of attack. The size, strength and traveling of the DS vortex, however, can be influenced by out-of-phase deflection of the DTEF. More effectively, the change in the airfoil camber line during flap oscillation can remarkably affect the pressure distribution around the airfoil, and hence, significant load alleviation and mean lift enhancement are achievable, all of which help the wind turbine performance and enhance the life span of the components. Moreover, a parametric study on flap size and amplitude of deflection together with a comparison between a discrete flap and a DTEF suggests an out-of-phase oscillation of a large gently curved DTEF, up to 30% of the total chord, with similar amplitude and frequency with respect to the airfoil is the best condition under which fatigue load control as well as enhancement in resultant load for a blade rotation can take place.

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Flow control for the vertical axis wind turbine by means of flapping flexible foils

Cited by 22 publications

References 19 publications

Impact of flexible blades on the vertical axis tidal turbine performances

Impact of flexible blades on the vertical axis tidal turbine performances

Electric vehicle battery charging framework using artificial intelligence modeling of a small wind turbine based on experimental characterization

The influence of oscillating trailing-edge flap on the dynamic stall control of a pitching wind turbine airfoil

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