Print Email Facebook Twitter An experimental and numerical analysis of the dynamic variation of the angle of attack in a vertical-axis wind turbine Title An experimental and numerical analysis of the dynamic variation of the angle of attack in a vertical-axis wind turbine Author Melani, P. F. (University of Florence) Balduzzi, F. (University of Florence) Brandetti, L. (TU Delft Wind Energy) Ferreira, Carlos (TU Delft Wind Energy) Bianchini, A. (University of Florence) Date 2020-09-22 Abstract Simulation methods ensuring a level of fidelity higher than that of the ubiquitous Blade Element Momentum theory are increasingly applied to VAWTs, ranging from Lifting-Line methods, to Actuator Line or Computational Fluid Dynamics (CFD). The inherent complexity of these machines, characterised by a continuous variation of the angle of attack during the cycloidal motion of the airfoils and the onset of many related unsteady phenomena, makes nonetheless a correct estimation of the actual aerodynamics extremely difficult. In particular, a better understanding of the actual angle of attack during the motion of a VAWT is pivotal to select the correct airfoil and functioning design conditions. Moving from this background, a high-fidelity unsteady CFD model of a 2-blade H-Darrieus rotor was developed and validated against unique experimental data collected using Particle Image Velocimetry (PIV). In order to reconstruct the AoA variation during one rotor revolution, three different methods-detailed in the study-were then applied to the computed CFD flow fields. The resulting AoA trends were combined with available blade forces data to assess the corresponding lift and drag coefficients over one rotor revolution and correlate them with the most evident flow macro-structures and with the onset of dynamic stall. Subject angle of attackCFDDarrieusPIVVAWT To reference this document use: http://resolver.tudelft.nl/uuid:26c81f54-ce59-42c9-995d-ae08d7cf7add DOI https://doi.org/10.1088/1742-6596/1618/5/052064 ISSN 1742-6588 Source Journal of Physics: Conference Series, 1618 (5) Event Science of Making Torque from Wind 2020, TORQUE 2020, 2020-09-28 → 2020-10-02, Online, Virtual, Online, Netherlands Part of collection Institutional Repository Document type journal article Rights © 2020 P. F. Melani, F. Balduzzi, L. Brandetti, Carlos Ferreira, A. Bianchini Files PDF Melani_2020_J._Phys._Conf ... 052064.pdf 921.39 KB Close viewer /islandora/object/uuid:26c81f54-ce59-42c9-995d-ae08d7cf7add/datastream/OBJ/view