Experimental characterisation of the wake behind paired vertical-axis wind turbines

Antoine Vergaerde, Tim De Troyer, Sara Muggiasca, Ilmas Bayati, Marco Belloli, Joanna Kluczewska-Bordier, Nicolas Parneix, Frederic Silvert, Mark C. Runacres

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Two vertical-axis wind turbines (VAWTs) benefit from a power increase when placed side by side in close proximity. To study the potential of paired VAWTs for integration in wind farms, wind tunnel wake measurements of lift-driven VAWTs are compared for isolated and three counter-rotating configurations. Because the wake of an isolated VAWT is deflected, the direction of rotation significantly influences the wake of paired VAWTs. The wake of counter-rotating VAWTs where the adjacent blades move downwind, exhibits a similar length, width and replenishment as the wake of an isolated VAWT. The wake of counter-rotating VAWTs with adjacent upwind moving blades, however, significantly differs from an isolated VAWT wake. While its wake length is similar to an isolated VAWT wake, its width and replenishment are not. Because of appealing wake characteristics, paired VAWTs exhibit unique advantages for wind farm applications, and especially for offshore floating wind farms.
Original languageEnglish
Article number104353
Number of pages13
JournalJournal of Wind Engineering and Industrial Aerodynamics
Publication statusPublished - Nov 2020


  • wake
  • Vertical-axis wind turbine
  • Wind tunnel
  • Experimental
  • Wind turbine applications
  • Paired wind turbines

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