Effect of struts and central tower on aerodynamics and aeroacoustics of vertical axis wind turbines using mid-fidelity and high-fidelity methods
dc.contributor.author | Shubham, Shubham | |
dc.contributor.author | Avallone, Francesco | |
dc.contributor.author | Brandetti, Livia | |
dc.contributor.author | Wright, Nigel | |
dc.contributor.author | Ianakiev, Anton | |
dc.date.accessioned | 2024-06-06T10:37:17Z | |
dc.date.available | 2024-06-06T10:37:17Z | |
dc.date.issued | 2024-01-04 | |
dc.description.abstract | This study investigates the impact of struts and a central tower on the aerodynamics and aeroacoustics of Darrieus Vertical Axis Wind Turbines (VAWTs) at chord-based Reynolds numbers of 8.12e4. A 2-bladed H-Darrieus VAWT is used, featuring a 1.5m diameter, a solidity of 0.1 and a blade cross-section of symmetrical NACA 0021. The turbine design is kept simple and straight-bladed which is essential for isolating and analyzing the specific effects of struts and a tower. The high-fidelity Lattice Boltzmann Method (LBM) in PowerFLOW 6-2020 and the mid-fidelity Lifting Line Free Vortex Wake (LLFVW) method in QBlade 2.0 are employed, with the mid-fidelity method providing a faster analytical tool for insights into the turbine performance. Firstly, both the LLFVW (mid-fidelity) and LBM (high-fidelity) methods effectively capture the general trends observed in VAWT power performance. However, the former predicts mean thrust values that are approximately 10% higher, and mean torque values that are approximately 19% higher, in comparison to the latter. Subsequently, the former predicts lower streamwise wake velocities relative to those predicted by the latter. These differences increase in configurations that include struts and a tower (to 30% - 31%). Secondly, the presence of struts and a tower leads to a reduction in both mean power (by 15% to 55%) and thrust (by 3% to 3.6%), with a further small decrease observed when doubling the tower diameter (power and thrust both by 0.5% to 3%). The struts predominantly affect the spanwise distribution of blade loading, while the tower impacts the azimuthal variation of blade loading. Additionally, the addition of struts and a tower reduces low-frequency noise (50-200 Hz) while increasing high-frequency noise (> 300 Hz). The observed decrease in mean blade loading results in reduced low-frequency noise, while the increase in high-frequency noise is ascribed to the increased intensity of BWI/BVI leading to higher unsteady loading fluctuations on blades. | en_UK |
dc.description.sponsorship | This project has received funding from the European Union’s Horizon 2020 Marie Curie zEPHYR research and innovation programme under grant agreement No EC grant 860101 (https://www.h2020-zephyr.eu/). | en_UK |
dc.identifier.citation | Shubham S, Avallone F, Brandetti L, et al., (2024) Effect of struts and central tower on aerodynamics and aeroacoustics of vertical axis wind turbines using mid-fidelity and high-fidelity methods. In AIAA SCITECH 2024 Forum, 8-12 January 2024, Orlando, USA, Paper number AIAA 2024-1485 | en_UK |
dc.identifier.isbn | 978-1-62410-711-5 | |
dc.identifier.uri | https://doi.org/10.2514/6.2024-1485 | |
dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/21983 | |
dc.language.iso | en_UK | en_UK |
dc.publisher | AIAA | en_UK |
dc.rights | Attribution 4.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | * |
dc.subject | Aerodynamic Simulation | en_UK |
dc.subject | Struts | en_UK |
dc.subject | Overall Sound Pressure Level | en_UK |
dc.subject | Horizontal Axis Wind Turbine | en_UK |
dc.subject | Lattice Boltzmann Approach | en_UK |
dc.subject | Vortex Structure | en_UK |
dc.subject | Blade Loading | en_UK |
dc.subject | Blade Vortex Interaction | en_UK |
dc.subject | NACA airfoil | en_UK |
dc.subject | Aerodynamic Performance | en_UK |
dc.title | Effect of struts and central tower on aerodynamics and aeroacoustics of vertical axis wind turbines using mid-fidelity and high-fidelity methods | en_UK |
dc.type | Conference paper | en_UK |
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