“Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge”

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dc.contributor.author Attie, Carla
dc.date.accessioned 2022-11-01T13:05:53Z
dc.date.available 2022-11-01T13:05:53Z
dc.date.copyright 2022 en_US
dc.date.issued 2022-07-20
dc.identifier.uri http://hdl.handle.net/10725/14189
dc.description.abstract Vertical axis wind turbines (VAWTs) exhibit dynamic stall under operational conditions which causes boundary layer separation from the surface of the blade. This hinders the turbine’s overall performance in which the turbine displays low efficiency, aerodynamic losses, and vibration and noise generation. The aim of this study is to optimize the performance of an H-type Darrieus VAWT by employing a single-slotted deflective flap at the trailing edge of the blade. To optimize the turbine’s performance, Computational Fluid Dynamics (CFD) and Design Of Experiments (DOE) methods are utilized simultaneously for time-saving purposes. The design parameters optimized for the NACA 0018 airfoil are the overlap (Δx), flap’s gap (Δy), and deflection angle (δf). The influence of each parameter on the performance of the VAWT are determined by DOE, which yields the optimum combination of design parameters for this H-rotor VAWT as Δx = 2 mm, Δy = 0.5 mm, and δf = 90 at TSR 3 where two-dimensional (2D) and three-dimensional (3D) CFD simulations yield turbine power increments of 27 % and 19 %, respectively. The flow characteristics of the 2D and 3D turbine models with slotted blades, developed using ANSYS Fluent R2020, demonstrated a delay in boundary layer separation and a reduction in vortices shedding due to the high-pressure flow through the slot, which in return reenergizes the boundary layer. The results from this study indicate an improved design of an H-rotor VAWT. en_US
dc.language.iso en en_US
dc.subject Vertical axis wind turbines -- Aerodynamics en_US
dc.subject Wind turbines -- Aerodynamics en_US
dc.subject Wind power -- Mathematical models en_US
dc.subject Lebanese American University -- Dissertations en_US
dc.subject Dissertations, Academic en_US
dc.title “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” en_US
dc.type Thesis en_US
dc.term.submitted Summer en_US
dc.author.degree Doctor of Pharmacy en_US
dc.author.school SOE en_US
dc.author.idnumber 201401809 en_US
dc.author.commembers Khoury, Michel
dc.author.commembers Issa, Jimmy
dc.author.department Industrial And Mechanical Engineering en_US
dc.description.physdesc 1 online resource (xii, 43 leaves): col. ill. en_US
dc.author.advisor El Cheikh, Amne
dc.keywords Vertical Axis Wind Turbine en_US
dc.keywords H Rotor en_US
dc.keywords Slotted Deflective Flap en_US
dc.keywords Computational Fluid Dynamics en_US
dc.keywords Design of Experiments en_US
dc.keywords Aerodynamic Performance en_US
dc.description.bibliographiccitations Includes bibliographical references (leaves 40-43) en_US
dc.identifier.doi https://doi.org/10.26756/th.2022.495
dc.author.email carla.attie@lau.edu en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php en_US
dc.publisher.institution Lebanese American University en_US
dc.author.affiliation Lebanese American University en_US

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