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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-2020-98
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-98
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  06 Oct 2020

06 Oct 2020

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This preprint is currently under review for the journal WES.

A Method for Preliminary Rotor Design – Part 1: Radially Independent Actuator Disk model

Kenneth Loenbaek1,2, Christian Bak2, Jens I. Madsen1, and Michael McWilliam2 Kenneth Loenbaek et al.
  • 1Suzlon Blade Science Center, Brendstrupgaardsvej 13, 8210 Aarhus, Denmark
  • 2Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark

Abstract. We present an analytical model for assessing the aerodynamic performance of a wind turbine rotor though a different parametrization of the the classical Blade Element Momentum (BEM) model. The model is named the Radially Independent Actuator Disc model (RIAD) and it establishes an analytical relationship between the local-thrust loading and the local-power, known as the Local-Thrust-Coefficient and the Local-Power-Coefficient respectively. The model has a direct physical interpretation, showing the contribution for each of the 3 losses: wake-rotation-loss, tip-loss and viscous-loss. The gradients for RIAD is found through the use of the Complex-step-method and power optimization is used to show how easily the method can be used for rotor optimization. The main benefit of RIAD is the ease at which it can be applied for rotor optimization, and especially load constraint power optimization as it is described in Loenbaek et al. (2020). The relationship between the RIAD input and the rotor chord and twist is established and it is validate against a BEM solver.

Kenneth Loenbaek et al.

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Latest update: 29 Oct 2020
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Short summary
We present a model for assessing the aerodynamic performance of a wind turbine rotor through a different parametrization of the classical Blade Element Momentum model. The model establishes an analytical relationship between the loading in the flow direction and the power along the rotor span. The main benefit of the model is the ease at which it can be applied for rotor optimization, and especially load constraint power optimization.
We present a model for assessing the aerodynamic performance of a wind turbine rotor through a...
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