A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability
This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (C<sub>p</sub>) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimic...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-04-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/8/1446 |
| _version_ | 1811263119407710208 |
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| author | Elie Antar Amne El Cheikh Michel Elkhoury |
| author_facet | Elie Antar Amne El Cheikh Michel Elkhoury |
| author_sort | Elie Antar |
| collection | DOAJ |
| description | This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (C<sub>p</sub>) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed. |
| first_indexed | 2024-04-12T19:38:57Z |
| format | Article |
| id | doaj.art-9be764f3bdfc4ec79ed7d13e836e0a59 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-12T19:38:57Z |
| publishDate | 2019-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9be764f3bdfc4ec79ed7d13e836e0a592022-12-22T03:19:08ZengMDPI AGEnergies1996-10732019-04-01128144610.3390/en12081446en12081446A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning CapabilityElie Antar0Amne El Cheikh1Michel Elkhoury2School of Engineering, Lebanese American University, P.O. Box 36, Byblos 1102, LebanonSchool of Engineering, Lebanese American University, P.O. Box 36, Byblos 1102, LebanonSchool of Engineering, Lebanese American University, P.O. Box 36, Byblos 1102, LebanonThis work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (C<sub>p</sub>) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed.https://www.mdpi.com/1996-1073/12/8/1446dynamic rotorvertical-axis wind turbineSavonius–Darrieus variable configuration |
| spellingShingle | Elie Antar Amne El Cheikh Michel Elkhoury A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability Energies dynamic rotor vertical-axis wind turbine Savonius–Darrieus variable configuration |
| title | A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability |
| title_full | A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability |
| title_fullStr | A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability |
| title_full_unstemmed | A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability |
| title_short | A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability |
| title_sort | dynamic rotor vertical axis wind turbine with a blade transitioning capability |
| topic | dynamic rotor vertical-axis wind turbine Savonius–Darrieus variable configuration |
| url | https://www.mdpi.com/1996-1073/12/8/1446 |
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