DescriptionWe present high-resolution 2D wind field measurements scanned upwind in the induction zone of an 850 kW and 52 m rotor diameter (D) DTU test wind turbine (Vestas V52).
Two high-resolution synchronised lidars  (6” short-range WindScanners) scanned the inflow in a 2D vertical plane between the turbine rotor and an upwind met-mast located at +2.2D. A DTU SpinnerLidar installed on top of the turbine nacelle scanned the wind field crosswind in the rotor plane at +1D.
We compare the lidar-scanned wind field measurements with vertical profile measurements at five heights in the met-mast equipped with cup anemometers and sonic anemometers, cf. Fig. 1.
We have investigated two cases obtained during periods when the mean wind direction aligned favourably within a few degrees with the met-tower turbine connection line. The first, characterised by strong winds, encountered during June 4., 2018, of average wind speed 17 m/s and another, encountered on December 10. 2018, with average wind speed about 10 m/s (Fig. 1) will be presented.
During Westerly winds (291 degrees) the turbine, installed 9 m above sea level, experiences heterogeneous inflow through the met-mast located at +2.2D and installed 7 m above sea level. Further upwind, a relative steep escarpment of approximately 6 m height lead down towards the coastline 225 m upwind that also influenced the flow field. Fig. 1 shows the terrain (bottom), the two WindScanners (black squares), the met-masts five measurement heights (black dots), and the SpinnerLidars scanning range +1D in front of the turbine. In addition, the reduction in wind speed in front of the V52 nacelle is apparent.
The vertically scanned 2D wind field between the met-mast and the turbine show significant influence incurred by both turbine induction zone and terrain effects: caused by the escarpment, an increased wind speed extends from the ground and up to approximately 40 m height. In front of the turbine, the vertical wind components diverges due to induction around the rotor. Stagnation in front of the turbine is observed already in the met-towers vertical profile. At +1D, the SpinnerLidar simultaneous acquired line-of-sight measurements on a 30 degrees cones spherical surface. Data was used to calculate mean wind fields of all three wind components using the fast CFD code LINCOM. In addition, the SpinnerLidar reconstructed 3D wind fields also show influence of induction-reduced inflow and flow divergence around the rotor.
|Period||17 Jun 2019 → 21 Jun 2019|
|Event title||Wind Energy Science Conference 2019: Wind Energy Science Conference 2019|
|Degree of Recognition||International|
- DTU SpinnerLidar
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Research output: Contribution to conference › Conference abstract for conference › Research › peer-review