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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-2020-35
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-35
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 11 Feb 2020

Submitted as: research article | 11 Feb 2020

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This preprint is currently under review for the journal WES.

Determination of the Angle of Attack on a Research Wind Turbine Rotor Blade Using Surface Pressure Measurements

Rodrigo Soto-Valle1, Sirko Bartholomay1, Joerg Alber1, Marinos Manolesos2, Christian Navid Nayeri1, and Christian Oliver Paschereit1 Rodrigo Soto-Valle et al.
  • 1Technische Universität Berlin, Hermann-Föttinger Institut, Müller-Breslau-Straße 8,10623 Berlin, Germany
  • 2College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea, SA1 8EN, UK

Abstract. In this paper, a method to determine the angle of attack on a wind turbine rotor blade using a chordwise pressure distribution measurement was applied. The approach uses a reduced number of pressure taps data located close to the blade leading edge. The results were compared with three 3-hole probes located at different radial positions and analytical calculations. The experimental approaches are based on the 2-D flow assumption; the pressure tap method is an application of the thin airfoil theory and the 3-hole probe method uses external probe measurements and applies geometrical and induction corrections.

The experiments were conducted in the wind tunnel at the Hermann Föttinger Institut of the Technische Unversität Berlin. The research turbine is a three-bladed upwind horizontal axis wind turbine model with a rotor diameter of 3 m. The measurements were carried out at rated condition with a tip speed ratio of 4.35 and different yaw and pitch angles were tested in order to compare both methods over a wide range of conditions.

Results show that the pressure taps method is suitable with a similar angle of attack results as the 3-hole probes for the aligned case. When a yaw misalignment was introduced the method captures the same trend and feature of the analytical estimations. Nevertheless, it is not able to capture the tower influence. Regarding the influence of pitching the blades, a linear relationship between the angle of attack and pitch angle was found.

Rodrigo Soto-Valle et al.

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Latest update: 01 Apr 2020
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Short summary
In this paper, a method to determine the angle of attack on a wind turbine rotor blade using a pressure distribution measurement was applied. The tested method uses the information of a reduced number of pressure taps and is a significant step that eliminates the need for external probes, which affect the flow over the blade and require additional calibration.
In this paper, a method to determine the angle of attack on a wind turbine rotor blade using a...
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