Wind turbine wake characterization from temporally disjunct 3-D measurements
Abstract
Scanning LiDARs can be used to obtain three-dimensional wind measurements in and beyond the atmospheric surface layer. In this work, metrics characterizing wind turbine wakes are derived from LiDAR observations and from large-eddy simulation (LES) data, which are used to recreate the LiDAR scanning geometry. The metrics are calculated for two-dimensional planes in the vertical and cross-stream directions at discrete distances downstream of a turbine under single-wake conditions. The simulation data are used to estimate the uncertainty when mean wake characteristics are quantified from scanning LiDAR measurements, which are temporally disjunct due to the time that the instrument takes to probe a large volume of air. Based on LES output, we determine that wind speeds sampled with the synthetic LiDAR are within 10% of the actual mean values and that the disjunct nature of the scan does not compromise the spatial variation of wind speeds within the planes. We propose scanning geometry density and coverage indices, which quantify the spatial distribution of the sampled points in the area of interest and are valuable to design LiDAR measurement campaigns for wake characterization. Lastly, we find that scanning geometry coverage is important for estimates of the wake center, orientation and length scales,more »
- Authors:
-
- Cornell Univ., Ithaca, NY (United States)
- SpurrEnergy Ltd., Vancouver, BC (Canada)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1339506
- Report Number(s):
- NREL/JA-5000-67719
Journal ID: ISSN 2072-4292
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Remote Sensing
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 11; Journal ID: ISSN 2072-4292
- Publisher:
- MDPI
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 17 WIND ENERGY; wind energy; turbine; wakes; LiDAR
Citation Formats
Doubrawa, Paula, Barthelmie, Rebecca J., Wang, Hui, Pryor, S. C., and Churchfield, Matthew. Wind turbine wake characterization from temporally disjunct 3-D measurements. United States: N. p., 2016.
Web. doi:10.3390/rs8110939.
Doubrawa, Paula, Barthelmie, Rebecca J., Wang, Hui, Pryor, S. C., & Churchfield, Matthew. Wind turbine wake characterization from temporally disjunct 3-D measurements. United States. https://doi.org/10.3390/rs8110939
Doubrawa, Paula, Barthelmie, Rebecca J., Wang, Hui, Pryor, S. C., and Churchfield, Matthew. Thu .
"Wind turbine wake characterization from temporally disjunct 3-D measurements". United States. https://doi.org/10.3390/rs8110939. https://www.osti.gov/servlets/purl/1339506.
@article{osti_1339506,
title = {Wind turbine wake characterization from temporally disjunct 3-D measurements},
author = {Doubrawa, Paula and Barthelmie, Rebecca J. and Wang, Hui and Pryor, S. C. and Churchfield, Matthew},
abstractNote = {Scanning LiDARs can be used to obtain three-dimensional wind measurements in and beyond the atmospheric surface layer. In this work, metrics characterizing wind turbine wakes are derived from LiDAR observations and from large-eddy simulation (LES) data, which are used to recreate the LiDAR scanning geometry. The metrics are calculated for two-dimensional planes in the vertical and cross-stream directions at discrete distances downstream of a turbine under single-wake conditions. The simulation data are used to estimate the uncertainty when mean wake characteristics are quantified from scanning LiDAR measurements, which are temporally disjunct due to the time that the instrument takes to probe a large volume of air. Based on LES output, we determine that wind speeds sampled with the synthetic LiDAR are within 10% of the actual mean values and that the disjunct nature of the scan does not compromise the spatial variation of wind speeds within the planes. We propose scanning geometry density and coverage indices, which quantify the spatial distribution of the sampled points in the area of interest and are valuable to design LiDAR measurement campaigns for wake characterization. Lastly, we find that scanning geometry coverage is important for estimates of the wake center, orientation and length scales, while density is more important when seeking to characterize the velocity deficit distribution.},
doi = {10.3390/rs8110939},
journal = {Remote Sensing},
number = 11,
volume = 8,
place = {United States},
year = {Thu Nov 10 00:00:00 EST 2016},
month = {Thu Nov 10 00:00:00 EST 2016}
}
Web of Science
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