Abstract

The wake of Horizontal Axis Wind Turbine rotor was studied with both wind tunnel and field measurements. The detail measurements were carried out in the wind tunnel with Pitot tube array, and particle image velocimetry (PIV). The field measurements were carried out with cup anemometers and wind vane for 10-m diameter rotor. From the wind tunnel measurement, the wake was expanded from the position where the tip vortex was dissipated. The wake velocity behind field wind turbine was recovered in shorter distance than that for the wind tunnel measurement. The wake area was shifted toward radial direction in rotational plane related to wind turbine rotational direction. The wake velocity below rotor axis was not much recovered by the effect of tower compared to those above rotor axis.

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