Long-Range Doppler Lidar Measurements of Wind Turbine Wakes and Their Interaction with Turbulent Atmospheric Boundary-Layer Flow at Perdigao 2017: Article No. 032034

Norman Wildmann, Thomas Gerz, Julie Lundquist

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations

Abstract

As part of the Perdigão 2017 campaign, vertical RHI (range-height indicator) scans with long-range pulsed Doppler wind lidars were performed aligned with the main wind direction and a wind turbine (WT) located on a mountain ridge. The measurements are used to not only retrieve flow velocities, but also their variance and - by using the turbulent broadening of the Doppler spectrum - also turbulent kinetic energy (TKE) dissipation rate. The study shows that turbulence in the WT wake is dependent on the turbulence of the inflow, but also on atmospheric stability. In stable atmospheric conditions, wakes could be analyzed up to five rotor diameters downstream (D) and showed the maximum turbulence in the wake at 2-3 D, whereas in unstable conditions, the maximum was found at 2 D and the wake could not be detected further than 3 D. A clear dependency of wake turbulence enhancement on inflow turbulence intensity is found, which levels out to no further enhancement at turbulence intensities of 30%.
Original languageAmerican English
Number of pages10
JournalJournal of Physics: Conference Series
Volume1618
DOIs
StatePublished - 2020

NREL Publication Number

  • NREL/JA-5000-77994

Keywords

  • Doppler wind lidars
  • flow velocities
  • turbulent kinetic energy
  • variance
  • wind direction
  • wind turbine

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