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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-2019-88
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-88
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 02 Dec 2019

Submitted as: research article | 02 Dec 2019

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

Differences in damping of edgewise whirl modes operating an upwind turbine in a downwind configuration

Gesine Wanke1, Leonardo Bergami1, and David Robert Verelst2 Gesine Wanke et al.
  • 1Suzlon Blade Science Center, Havneparken 1, 7100 Vejle, Denmark
  • 2DTU Wind Energy, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. The qualitative changes in damping of the first edgewise modes when an upwind wind turbine is converted into the respective downwind configuration are investigated. A model of a Suzlon S111 2.1 MW turbine is used to show that the interaction of tower torsion and the rotor modes is the main reason for the change in edgewise damping. For the forward whirl mode a maximum decrease in edgewise damping of 39 % is observed and for the backward whirl mode a maximum increase of 18 % in edgewise damping is observed when the upwind configuration is changed into the downwind configuration. The shaft length is shown to be influencing the interaction between tower torsion and rotor modes as out-of-plane displacements can be increased or decreased with increasing shaft length due to the phase difference between rotor and tower motion. Modifying the tower torsional stiffness is seen to give the opportunity in the downwind configuration to account for both, a favorable placements of the edgewise frequency relative to the second yaw frequency, as well as a favorable phasing in the mode shapes.

Gesine Wanke et al.
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Latest update: 09 Dec 2019
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Short summary
Converting an upwind wind turbine into a downwind configuration shown to come with higher edgewise loads due to lower edgewise damping. The study shows from modal displacements of a reduced order turbine model, that the interaction between the forces on the rotor, the rotor motion and the tower torsion is the main reason of the observed damping decrease. The interaction between the forces on the rotor, the rotor motion and the tower torsion is the main reason of the observed damping decrease.
Converting an upwind wind turbine into a downwind configuration shown to come with higher...
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