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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 01 Mar 2019

Research articles | 01 Mar 2019

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

First Identification and Quantification of Detached Tip VorticesBehind a WEC Using Fixed Wing UAS

Moritz Mauz1, Alexander Rautenberg1, Andreas Platis1, Marion Cormier2, and Jens Bange1 Moritz Mauz et al.
  • 1Centre for Applied Geoscience, Eberhard Karls University Tübingen, 72074 Tübingen, Germany
  • 2Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, 70569 Stuttgart, Germany

Abstract. Quantifying blade tip vortices helps to understand the process of vortices detaching from the wind converter blade and their development in the wake until finally dissipating in the far wake, contributing to overall turbulence. This is especially interesting for set-ups of numerical simulations when setting the spatial resolution of the simulation grid.

The MASC MK 3 (Multi-purpose Airborne Sensor Carrier Mark 3) UAS (Unmanned Aircraft System) by the University of Tübingen measured atmospheric and meteorological quantities during the HeliOW campaign in July 2018 data behind a wind energy converter (WEC) (Enercon E-112) north of Wilhelmshaven, Germany, at the Jade Wind Park. Aside turbulence distribution, air temperature, humidity and the three wind components u, v, w in front of the WEC and in the wake were measured. By evaluation of the wind components, detached blade tip vortices were identified in the time series. The presented data were captured under a dominating marine stratification about 2 km from the North Sea coast line with northern wind direction. The measured vortices are compared to the analytical Burnham-Hallock model for two vortices spinning in opposite direction. The model has its origin in aviation, where it describes two aircraft wake vortices. It will be shown that the BH model can be used to describe wake vortices behind a WEC. An evaluation method is presented to measure detached tip vortices with a fixed wing UAS. Also an improvement for the model in WEC wake use will be proposed.

Moritz Mauz et al.
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Status: final response (author comments only)
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Moritz Mauz et al.
Moritz Mauz et al.
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Short summary
UAS systems provide in-situ measurements of turbulence and wind conditions. In the presented paper the tip vortex generated by wind energy converters is measured. The extent of these vortices is crucial to set up a simulation grid for numerical simulations, otherwise these vortices can not be identified. A method is presented to evaluate UAS measurements to identify tip vortices of wind energy converters. The results are comparable to expectations from literature.
UAS systems provide in-situ measurements of turbulence and wind conditions. In the presented...