Print Email Facebook Twitter On the wake deflection of vertical axis wind turbines by pitched blades Title On the wake deflection of vertical axis wind turbines by pitched blades Author Huang, M. (TU Delft Flow Physics and Technology; TU Delft Wind Energy) Sciacchitano, A. (TU Delft Flow Physics and Technology; TU Delft Aerodynamics) Ferreira, Carlos (TU Delft Flow Physics and Technology; TU Delft Wind Energy) Department Flow Physics and Technology Date 2023 Abstract Wake losses are a critical consideration in wind farm design. The ability to steer and deform wakes can result in increased wind farm power density and reduced energy costs and can be used to optimize wind farm designs. This study investigates the wake deflection of a vertical axis wind turbine (VAWT) experimentally, emphasizing the effect of different load distributions on the wake convection and mixing. A trailing vortex system responsible for the wake topology is hypothesized based on a simplified vorticity equation that describes the relationship between load distribution and its vortex generation; the proposed vorticity system and the resulting wake topology are experimentally validated in the wind tunnel via stereoscopic particle image velocimetry measurements of the flow field at several wake cross-sections. Variations in load distribution are accomplished by a set of fixed blade pitches. The experimental results not only validate the predicted vorticity system but also highlight the critical role of the streamwise vorticity component in the deflection and deformation of the wake, thus affecting the momentum and energy recoveries. The evaluation of the various loading cases demonstrates the significant effect of the wake deflection on the wind power available to a downwind turbine, even when the distance between the two turbines is only three diameters. Subject particle image velocimetryvertical axis wind turbinesvortex dynamicswakes To reference this document use: http://resolver.tudelft.nl/uuid:28b8b94c-0cb4-4e16-acd1-6c3a8e9a5190 DOI https://doi.org/10.1002/we.2803 ISSN 1095-4244 Source Wind Energy, 26 (4), 365-387 Part of collection Institutional Repository Document type journal article Rights © 2023 M. Huang, A. Sciacchitano, Carlos Ferreira Files PDF Wind_Energy_2023_Huang_On ... blades.pdf 6.02 MB Close viewer /islandora/object/uuid:28b8b94c-0cb4-4e16-acd1-6c3a8e9a5190/datastream/OBJ/view