“Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge”
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 genera...
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| Format: | masterThesis |
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2022
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| Online Access: | http://hdl.handle.net/10725/14189 https://doi.org/10.26756/th.2022.495 http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php |
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| _version_ | 1864513468746432512 |
|---|---|
| author | Attie, Carla |
| author_facet | Attie, Carla |
| author_role | author |
| dc.creator.none.fl_str_mv | Attie, Carla |
| dc.date.none.fl_str_mv | 2022-11-01T13:05:53Z 2022-11-01T13:05:53Z 2022 2022-07-20 |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10725/14189 https://doi.org/10.26756/th.2022.495 http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php |
| dc.language.none.fl_str_mv | en |
| dc.publisher.none.fl_str_mv | Lebanese American University |
| dc.rights.*.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Vertical axis wind turbines -- Aerodynamics Wind turbines -- Aerodynamics Wind power -- Mathematical models Lebanese American University -- Dissertations Dissertations, Academic |
| dc.title.none.fl_str_mv | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| dc.type.none.fl_str_mv | Thesis info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/masterThesis |
| description | 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. |
| eu_rights_str_mv | openAccess |
| format | masterThesis |
| id | LAURepo_4e5bcd046b1178457ba41c8bac701c5b |
| language_invalid_str_mv | en |
| network_acronym_str | LAURepo |
| network_name_str | Lebanese American University repository |
| oai_identifier_str | oai:laur.lau.edu.lb:10725/14189 |
| publishDate | 2022 |
| publisher.none.fl_str_mv | Lebanese American University |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge”Attie, CarlaVertical axis wind turbines -- AerodynamicsWind turbines -- AerodynamicsWind power -- Mathematical modelsLebanese American University -- DissertationsDissertations, AcademicVertical 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.1 online resource (xii, 43 leaves): col. ill.Includes bibliographical references (leaves 40-43)Lebanese American University2022-11-01T13:05:53Z2022-11-01T13:05:53Z20222022-07-20Thesisinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesishttp://hdl.handle.net/10725/14189https://doi.org/10.26756/th.2022.495http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.phpeninfo:eu-repo/semantics/openAccessoai:laur.lau.edu.lb:10725/141892022-11-01T13:06:22Z |
| spellingShingle | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” Attie, Carla Vertical axis wind turbines -- Aerodynamics Wind turbines -- Aerodynamics Wind power -- Mathematical models Lebanese American University -- Dissertations Dissertations, Academic |
| status_str | publishedVersion |
| title | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| title_full | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| title_fullStr | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| title_full_unstemmed | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| title_short | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| title_sort | “Performance Enhancement of a Vertical Axis Wind Turbine using a Slotted Deflective Flap at the Trailing Edge” |
| topic | Vertical axis wind turbines -- Aerodynamics Wind turbines -- Aerodynamics Wind power -- Mathematical models Lebanese American University -- Dissertations Dissertations, Academic |
| url | http://hdl.handle.net/10725/14189 https://doi.org/10.26756/th.2022.495 http://libraries.lau.edu.lb/research/laur/terms-of-use/thesis.php |