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LASER MEASUREMENTS OF WAKE DYNAMICS RISØ National Laboratory / DTU Roskilde DENMARK 9th May 2007

LASER MEASUREMENTS OF WAKE DYNAMICS RISØ National Laboratory / DTU Roskilde DENMARK 9th May 2007. A New Anemometer. remote sensing instruments. Høvsøre Nysted. 2 5 points on each height. Conical Scanning Mode. Original Working Mode of ZephIR. 1 round = 1 second

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LASER MEASUREMENTS OF WAKE DYNAMICS RISØ National Laboratory / DTU Roskilde DENMARK 9th May 2007

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  1. LASER MEASUREMENTS OF WAKE DYNAMICS RISØ National Laboratory / DTU Roskilde DENMARK 9th May 2007

  2. A New Anemometer remote sensing instruments... Høvsøre Nysted

  3. 25 points on each height Conical Scanning Mode Original Working Mode of ZephIR • 1 round = 1 second • 3 rounds give 1 good data • It can change focus distance in 1 sec • φ=30o (Azimut angle) • θ=[0:π/2] (scanning angle) u H l -φ φ Max height = 200m Min height = 5m

  4. Conical Scanning Mode C u B A D B A C D

  5. Reliability

  6. Development and Experiments at Risø

  7. Different Experiment Models

  8. With the wedge Without the wedge The wedge from left The wedge Removing the wedge

  9. p’ Staring Mode

  10. An add-on : Tilt and Pan Head The Lidar can be mounted onto the Head and controlled

  11. P2 P1 Simple Line Scanning Mode • derived from the Staring Mode and the movement of the Head in pan direction • captures data from points on an arc. P2 P1

  12. P6 P4 P5 P2 P3 P1 Deep Line Scanning Mode • derived from the Staring Mode and the movement of the Head in pan and tilt direction by changing the focus distance P6 P2 P4 P1 P3 P5

  13. 2D Scan

  14. 2D Scan Path

  15. 3 1 2 4 5 6 Experimental Setup

  16. ZephIR on Tellus

  17. Experiment area New MM Tellus 100kW Nordtank 500kW OldMM

  18. Data collection & selection

  19. ZephIR on Operation

  20. Results

  21. Software tune-up ZephIR LabView software works at • 20 Hz in conical scanning and staring mode • 15 Hz in any multi thread mode. We use • C++ instead of LabView • Multithreaded coding structure • FFTW (Fastest Fourier Transform in the West)

  22. Rest 0.8% Acquisition 36.8% FFT 46.6% Reading 15.9% Multi Thread Scanning Freq. improvement factor of 9

  23. How does it help? 136 Hz Wind Speed [m/s] Cross Stream distance [m] 15 Hz Wind Speed [m/s] Cross Stream distance [m]

  24. Simple Line Scanning Sample Line Scans at 72m

  25. Deep Line Scanning Sample Line Scans at 19, 76, 130 and 176m

  26. Synchronization with Met. Mast data*

  27. Synchronization with Met. Mast data*

  28. 2D Scan

  29. Conclusion • We have developed a new measurement technique that allows both for a 1D and a 2D scanning of the instantaneous longitudinal wake velocity. • Using this technique, we resolve the wake expansion in the moving frame of reference as well as the movements of the wake. • Resolving the wake meandering dynamics allow us to verify a basic assumption for dynamic wake modeling - i.e. that the wake deficit is advected passively by the larger than rotor size eddies in the inflow. • The present initial investigations seem to support this hypothesis for the investigated full scale turbine located in the atmospheric boundary layer.

  30. THANK YOU ! Ferhat BİNGÖL ferhat.bingoel@risoe.dk

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