Preprints
https://doi.org/10.5194/wes-2023-6
https://doi.org/10.5194/wes-2023-6
07 Feb 2023
 | 07 Feb 2023
Status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

Multi-Point In-Situ Measurements of Turbulent Flow in a Wind Turbine Wake and Inflow with a Fleet of UAS

Tamino Wetz and Norman Wildmann

Abstract. The demand on wind energy for power generation will increase significantly in the next decade due to the transformation towards renewable energy production. In order to optimize the power generation of a wind farm, it is crucial to understand the flow in the wind turbine wake. The flow in the near wake close downstream of the wind turbine (WT) is complex and highly three-dimensional. In the present study, for the first time, the SWUF-3D fleet of multirotor UAS is deployed for field measurements on an operating 2~MW WT in complex terrain. The UAS-fleet has the potential to fill the meteorological gap of observations in the near wake with high temporal and spatial resolution wind vector measurements plus temperature, humidity and pressure. During the experiment, the flow up- and downstream of the WT is measured simultaneously. Various flight patterns are used to investigate the near wake of the WT. The velocity deficit and the turbulence profile in different downstream distances are measured by distributed UAS which are aligned perpendicular to the flow in the near wake. The results show the expected double-Gaussian shape in the near wake under nearly stable atmospheric conditions. However, measurements in unstable atmospheric conditions with high turbulence intensity levels lead to single Gaussian-like profiles at equal downstream distances (< 1D). Additionally, horizontal momentum fluxes and turbulence spectra are analyzed. The turbulence spectra of the wind measurement at the edge of the wake could reveal that tip vortices can be observed with the UAS.

Tamino Wetz and Norman Wildmann

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-6', Anonymous Referee #1, 17 Feb 2023
  • RC2: 'Comment on wes-2023-6', Stefano Letizia, 28 Feb 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-6', Anonymous Referee #1, 17 Feb 2023
  • RC2: 'Comment on wes-2023-6', Stefano Letizia, 28 Feb 2023

Tamino Wetz and Norman Wildmann

Tamino Wetz and Norman Wildmann

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Short summary
In the present study, for the first time, the SWUF-3D fleet of multirotor is deployed for field measurements on an operating 2~MW wind turbine (WT) in complex terrain. The fleet of multirotor has the potential to fill the meteorological gap of observations in the near wake of WT with high temporal and spatial resolution wind vector measurements plus temperature, humidity and pressure. The flow up- and downstream of the WT is measured simultaneously at multiple spatial position.