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Title: 3D load estimation on a horizontal axis wind turbine using SPIV
Authors: Campo, Vanessa del
Ragni, Daniele
Micallef, Daniel
Akay, Busra
Diez, Francisco Javier
Ferreira, Carlos Simao
Keywords: Particle image velocimetry
Horizontal axis wind turbines
Wind tunnel models
Wakes (Aerodynamics)
Issue Date: 2014
Publisher: John Wiley & Sons Ltd.
Citation: Del Campo, V., Ragni, D., Micallef, D., Akay, B., Diez, F. J., & Simao Ferreira, C. (2014). 3D load estimation on a horizontal axis wind turbine using SPIV. Wind Energy, 17(11), 1645-1657.
Abstract: The flow around the blade of a horizontal axis wind turbine wind tunnel model, operating at its optimal tip speed ratio in axial flow, has been investigated by means of stereoscopic particle image velocimetry (SPIV). The aim was to assess the possibility of measuring the loads impinged on the blade, using the acquired velocity field and its spatial derivatives. Thus, the three-dimensional (3D) velocity field and the pressure distribution surrounding the blade, as well as the aerodynamic loads, responsible for thrust and torque, were obtained with a non-intrusive method. The SPIV equipment was mounted on a traverse system and provided with phase-locked velocity planes perpendicular to the blade axis, scanning the blade from the root to the tip, at a fixed azimuthal position. The obtained velocity fields were used to estimate the pressure distribution and the aerodynamic loads on each plane, using a 3D formulation. Finally, these results were compared and discussed with similar results obtained computationally with a panel method model, showing good consistency. In the future, the proposed methodology could be used to study relevant topics such as active load control techniques, rotational augmentation, dynamic stall phenomena and the aerodynamics of small wind turbines operating at low Re numbers, among others.
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