Blockage effects in wind farms
Abstract An experimental study of wind farm blockage has been performed to quantify the velocity decrease that the first row of a wind farm experiences due to the presence of the other turbines downstream. The general perception has been that turbines downstream of the first row are only influenced...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-02-01
|
| Series: | Wind Energy |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/we.2413 |
| _version_ | 1818271577099206656 |
|---|---|
| author | Antonio Segalini Jan‐Åke Dahlberg |
| author_facet | Antonio Segalini Jan‐Åke Dahlberg |
| author_sort | Antonio Segalini |
| collection | DOAJ |
| description | Abstract An experimental study of wind farm blockage has been performed to quantify the velocity decrease that the first row of a wind farm experiences due to the presence of the other turbines downstream. The general perception has been that turbines downstream of the first row are only influenced by the wakes from upstream turbines without any upstream effect. In the present study, an attempt is made to demonstrate the existence of a two‐way coupling between individual turbines and turbines in the wind farm. Several staggered layouts were tested in the wind tunnel experiments by changing the spacing between rows, spacing between turbines in the rows, and the amount of wind turbines involved. The experiments focused on turbines located in the center of the first row as well as the two turbines located in the row edges, usually believed to experience a speedup. The present results show that no speedup is present and that all the turbines in the first row are subjected to a reduced wind speed. This phenomenon has been considered to be due to “global blockage.” An empirical correlation formula between spacing, number of rows, and velocity decrease is proposed to quantify such effect for the center turbine as well as for the turbines at the edges. |
| first_indexed | 2024-12-12T21:28:23Z |
| format | Article |
| id | doaj.art-a58bc648016c44cfbb12a1b225093546 |
| institution | Directory Open Access Journal |
| issn | 1095-4244 1099-1824 |
| language | English |
| last_indexed | 2024-12-12T21:28:23Z |
| publishDate | 2020-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Wind Energy |
| spelling | doaj.art-a58bc648016c44cfbb12a1b2250935462022-12-22T00:11:23ZengWileyWind Energy1095-42441099-18242020-02-0123212012810.1002/we.2413Blockage effects in wind farmsAntonio Segalini0Jan‐Åke Dahlberg1Linné Flow Centre, STandUP for Wind KTH Mechanics Stockholm SwedenVattenfall Vindkraft AB Stockholm SwedenAbstract An experimental study of wind farm blockage has been performed to quantify the velocity decrease that the first row of a wind farm experiences due to the presence of the other turbines downstream. The general perception has been that turbines downstream of the first row are only influenced by the wakes from upstream turbines without any upstream effect. In the present study, an attempt is made to demonstrate the existence of a two‐way coupling between individual turbines and turbines in the wind farm. Several staggered layouts were tested in the wind tunnel experiments by changing the spacing between rows, spacing between turbines in the rows, and the amount of wind turbines involved. The experiments focused on turbines located in the center of the first row as well as the two turbines located in the row edges, usually believed to experience a speedup. The present results show that no speedup is present and that all the turbines in the first row are subjected to a reduced wind speed. This phenomenon has been considered to be due to “global blockage.” An empirical correlation formula between spacing, number of rows, and velocity decrease is proposed to quantify such effect for the center turbine as well as for the turbines at the edges.https://doi.org/10.1002/we.2413wind farm blockage |
| spellingShingle | Antonio Segalini Jan‐Åke Dahlberg Blockage effects in wind farms Wind Energy wind farm blockage |
| title | Blockage effects in wind farms |
| title_full | Blockage effects in wind farms |
| title_fullStr | Blockage effects in wind farms |
| title_full_unstemmed | Blockage effects in wind farms |
| title_short | Blockage effects in wind farms |
| title_sort | blockage effects in wind farms |
| topic | wind farm blockage |
| url | https://doi.org/10.1002/we.2413 |
| work_keys_str_mv | AT antoniosegalini blockageeffectsinwindfarms AT janakedahlberg blockageeffectsinwindfarms |