Noura Nait Bouda’s scientific contributions

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Publications (2)


Numerical Analysis of the Kline and Fogleman Airfoil's Effect on the Operation of Straight Darrieus Wind Turbine
  • Article
  • Full-text available

May 2024

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125 Reads

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1 Citation

Journal of Applied Fluid Mechanics

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Noura Nait Bouda

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The blade profile selection is paramount for the efficient operation of straight Darrieus wind turbines in terms of torque and power generation. In this work, we have used the Kline-Fogleman Airfoil (KFA) design for the wind turbine blades. The concept of KFA design aims to cause flow separation, vortex formation, and reattachment establishment before the trailing edge. Thus, geometric tests on have been performed on the baseline airfoil NACA0015 as one of the best profiles for operating a straight Darrius wind turbine. A two-dimensional Computational Fluid Dynamic (CFD) model using the two-equation Shear Stress Transport k-ω (SST k-ω) turbulent model was developed in ANSYS/FLUENT software to assess the aerodynamic efficiency of the modified airfoil. Two designs (KFA-2 and KFA-4) were tested initially in the static case. The effects of the opening step angle and its curvature diameter were studied for an angle of attack’s range of -20° to +20°. The rounded KFA-4 design with an opening step angle of 93.6° led to a significant improvement in the lift-to-drag ratio thus, aerodynamic efficiency. Finally, the straight KFA-4 design with the opening step angle of 93.6° revealed a the most advantageous effects on the operation of a straight Darrieus wind turbine for a Tip Speed Ratio less than 1.6 (TSR<1.6). It allowed a noticeable reduction of the dead zone and TSR corresponding to the nominal power, thus consequently improving the starting torque and delaying torque stall.

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Computational Fluid Dynamics Study on the efficiency of straight-bladed vertical axis wind turbine

April 2024

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88 Reads

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4 Citations

International Journal of Thermofluids

The present study treats numerically the performance of a straight-bladed, vertical axis, Darieus wind turbine. A two-dimensional (2D), Unsteady Reynolds-averaged Navier–Stokes (URANS) simulations were performed out by the solver ANSYS/FLUENT using the sliding mesh method. Four turbulence models, namely the one-equation Spalart– Almaras (SA) model, the two-equation Shear Stress Transport (SST) k-ω, the Transitional Shear Stress Transport (TSST), and the realizable k-ϵ models, with low Reynolds number capabilities, were tested. The dependency of the power curve upon the torque coefficient and the Tip Speed Ratio (TSR) was evaluated under identical conditions to previously published experimental studies. The results suggest that the realizable k- ϵ model outperformed other turbulence models and matched better with the experimental data. Further nu- merical investigations were performed to determine the conditions for an optimal performance of the VAWT in question.

Citations (2)


... Furthermore, this configuration proved effective in improving both the torque and self-starting capability within the azimuth angle range of 0 • to 150 • . One such method involves utilizing the Kline and Fogleman approach to design the rotor blades, which introduces steps on the blade, thereby sacrificing some efficiency for the better control of rotational and dynamic stall phenomena [31]. Another practical method for enhancing the aerodynamic performance of Darrieus VAWTs involves utilizing Doubled-Row configurations. ...

Reference:

Self-Starting Improvement and Performance Enhancement in Darrieus VAWTs Using Auxiliary Blades and Deflectors
Numerical Analysis of the Kline and Fogleman Airfoil's Effect on the Operation of Straight Darrieus Wind Turbine

Journal of Applied Fluid Mechanics

... In the studies by various authors, the aerodynamic and hydrodynamic performance of VAWTs and other renewable energy systems were comprehensively analyzed using advanced numerical simulations. To begin with, the aerodynamic performance of a straight-bladed Darrieus wind turbine was numerically investigated by Iddou et al. [24] using 2D URANS simulations with ANSYS/FLUENT. Four turbulence models, namely Spalart-Allmaras, SST k-ω, TSST, and realizable k-ε, were evaluated. ...

Computational Fluid Dynamics Study on the efficiency of straight-bladed vertical axis wind turbine

International Journal of Thermofluids