VAWT in double-rotor configuration: the effect on airfoil design

D. De Tavernier, Célia Maria Dias Ferreira, Ang Li, Uwe Schmidt Paulsen, Helge Aagaard Madsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    This work presents a study to identify the effect of double-rotor configuration on the airfoil selection of vertical-axis wind turbines (VAWTs). Simulations are performed using an inviscid panel/vortex model for two different counter-rotating layouts (counter-up and counter-down) and various tip speed ratios, solidities and rotor spacings are considered. The double-rotor configuration relatively enhances the power production and the flow characteristics revealed that this is due to the wake contraction, flow acceleration, and favourable angle of attack in between the rotors. With a multi-objective optimisation scheme airfoils are designed by balancing the aerodynamic and structural needs. The optimised airfoils outperform the airfoils from the initial generation and show the importance of an appropriate airfoil selection. The angle of attack encountered by the turbine in double-rotor configuration is only effected noticeably in between the rotors and therefore it is concluded that the double-rotor configuration does not significantly influence the airfoil design.
    Original languageEnglish
    Title of host publicationProceedings of 2018 Wind Energy Symposium, AIAA SciTech Forum
    Number of pages12
    PublisherAmerican Institute of Aeronautics and Astronautics
    Publication date2018
    Publication statusPublished - 2018
    Event2018 Wind Energy Symposium - Kissimmee, United States
    Duration: 8 Jan 201812 Jan 2018


    Conference2018 Wind Energy Symposium
    Country/TerritoryUnited States


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