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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2018-77
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2018-77
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 10 Jan 2019

Research articles | 10 Jan 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).

Power curve and wake analyses of the Vestas multi-rotor demonstrator

Maarten Paul van der Laan1, Søren Juhl Anderson2, Néstor Ramos García2, Nikolas Angelou1, Georg Raimund Pirrung1, Søren Ott1, Mikael Sjöholm1, Kim Hylling Sørensen3, Julio Xavier Vianna Neto3, Mark Kelly1, Torben Krogh Mikkelsen1, and Gunner Christian Larsen1 Maarten Paul van der Laan et al.
  • 1Technical University of Denmark, DTU Wind Energy, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark
  • 2Technical University of Denmark, DTU Wind Energy, Lyngby Campus, Anker Engelunds Vej 1, 2800 Lyngby, Denmark
  • 3Vestas Wind System A/S, Hedeager 42, 8200 Aarhus, Denmark

Abstract. Numerical simulations of the Vestas multi-rotor demonstrator (4R-V29) are compared with field measurements of power performance and remote sensing measurements of the wake deficit by a short-range WindScanner lidar system. The simulations predict a gain of 0–2% in power due to the rotor interaction, for wind speeds below rated. The power curve measurements also show that the rotor interaction increases the power performance below rated by 1.8±0.2%, which can result in a 1.5±0.2% increase in the annual energy production. The wake measurements and numerical simulations show four distinct wake deficits in the near wake, which merge into a single wake structure further downstream. Numerical simulations show that the wake recovery distance of a simplified 4R-V29 wind turbine is 1.03–1.44 Deq shorter than for an equivalent single-rotor wind turbine with a rotor diameter Deq. In addition, the numerical simulations show that the added wake turbulence of the simplified 4R-V29 wind turbine is lower in the far wake compared to the equivalent single-rotor wind turbine. The faster wake recovery and lower far-wake turbulence of such a multi-rotor wind turbine has the potential to reduce the wind turbine spacing within a wind farm while providing the same production.

Maarten Paul van der Laan et al.
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Maarten Paul van der Laan et al.
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Short summary
Over the past decades, single-rotor wind turbines have increased in size by extending the blades towards a 100 m. An alternative upscaling can be achieved by using a multi-rotor wind turbine. In this article, measurements and numerical simulations of a utility-scale four-rotor wind turbine show that the rotor interaction leads to an increased energy production and a faster wake recovery, which has the potential to design wind farms with an improved energy production.
Over the past decades, single-rotor wind turbines have increased in size by extending the blades...
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