Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements
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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-11-01
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| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2072-4292/8/11/939 |
| _version_ | 1819002945803386880 |
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| author | Paula Doubrawa Rebecca J. Barthelmie Hui Wang S. C. Pryor Matthew J. Churchfield |
| author_facet | Paula Doubrawa Rebecca J. Barthelmie Hui Wang S. C. Pryor Matthew J. Churchfield |
| author_sort | Paula Doubrawa |
| collection | DOAJ |
| description | 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. 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. |
| first_indexed | 2024-12-20T23:13:10Z |
| format | Article |
| id | doaj.art-1eb7b93182b84fb588ec7694c6fc8623 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-20T23:13:10Z |
| publishDate | 2016-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-1eb7b93182b84fb588ec7694c6fc86232022-12-21T19:23:42ZengMDPI AGRemote Sensing2072-42922016-11-0181193910.3390/rs8110939rs8110939Wind Turbine Wake Characterization from Temporally Disjunct 3-D MeasurementsPaula Doubrawa0Rebecca J. Barthelmie1Hui Wang2S. C. Pryor3Matthew J. Churchfield4Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USASibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USASgurrEnergy Ltd., Vancouver, BC V6C 2X6, CanadaDepartment of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, USANational Renewable Energy Laboratory, Golden, CO 80401, USAScanning 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. 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.http://www.mdpi.com/2072-4292/8/11/939windenergyturbinewakesLiDAR |
| spellingShingle | Paula Doubrawa Rebecca J. Barthelmie Hui Wang S. C. Pryor Matthew J. Churchfield Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements Remote Sensing wind energy turbine wakes LiDAR |
| title | Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements |
| title_full | Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements |
| title_fullStr | Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements |
| title_full_unstemmed | Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements |
| title_short | Wind Turbine Wake Characterization from Temporally Disjunct 3-D Measurements |
| title_sort | wind turbine wake characterization from temporally disjunct 3 d measurements |
| topic | wind energy turbine wakes LiDAR |
| url | http://www.mdpi.com/2072-4292/8/11/939 |
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