The Mean Velocity of the Near-Field of a Lab-Scale Wind Turbine in Tailored Turbulent Shear Flows
Chapter
Accepted version
Åpne
Permanent lenke
http://hdl.handle.net/11250/2618172Utgivelsesdato
2019Metadata
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Originalversjon
10.1007/978-3-030-22196-6_50Sammendrag
This study investigated the mean velocity of the near-field wake of a lab-scale wind turbine subjected to seven different incoming turbulent shear flows through particle image velocimetry. An active grid was used to generate the incoming flows with a novel actuation method that decoupled shear from turbulence intensity. The wake geometry relative to the incoming flows is symmetric and not significantly impacted by shear. A slight reduction in the relative wake velocity deficit was observed at x/D=2 for higher levels of freestream turbulence intensity. The hub velocity contour line was deflected towards the high-velocity side by shear upstream of the rotor. In the wake, higher local shear forced this contour line away from the rotor tip and towards the hub