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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-2020-97
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-97
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jul 2020

30 Jul 2020

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A revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

Identification of airfoil polars from uncertain experimental measurements

Chengyu Wang, Filippo Campagnolo, and Carlo L. Bottasso Chengyu Wang et al.
  • Wind Energy Institute, Technische Universität München, D-85748 Garching b. München, Germany

Abstract. A new method is described to identify the aerodynamic characteristics of blade airfoils directly from operational data of the turbine. Improving on a previously published approach, the present method is based on a new maximum likelihood formulation that includes both errors in the outputs and in the inputs, generalizing the classical error-in-the-outputs only formulation. Since many parameters are necessary to meaningfully represent the behavior of airfoil polars as functions of angle of attack and Reynolds number, the approach uses a singular value decomposition to solve for a reduced set of observable parameters. The new approach is demonstrated by identify high quality polars for small-scale wind turbines used in wind tunnel experiments for wake and wind farm control research.

Chengyu Wang et al.

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Chengyu Wang et al.

Chengyu Wang et al.

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Latest update: 29 Oct 2020
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Short summary
A new method is described to identify the aerodynamic characteristics of blade airfoils directly from operational data of the turbine. Improving on previously published approach, the present method is based on a new maximum likelihood formulation that includes both errors in the outputs and in the inputs. The method is demonstrated on the identification of the polars of small scale turbines for wind tunnel testing.
A new method is described to identify the aerodynamic characteristics of blade airfoils directly...
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