Determination of the aerodynamic performance of horizontal-axis wind turbines (HAWT) is complicated by problems such as wake deformation effects and free stream turbulence. An accurate prediction of the wake structure is a dominant factor for reliable wind turbine aerodynamic prediction codes. The technique of Particle Image Velocimetry is used to provide detailed full-field data of the wake geometry in the immediate vicinity of the rotor of a reduced-scale wind turbine. The results strongly validate the PIV technique applied to studying wind turbine wakes. The potential for this method is significant and can be used to compare wake data from other experiments as well as wake geometries predicted by theoretical models
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