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| Titel |
The role of turbulent mixing in wind turbine wake recovery and wind array performance |
| VerfasserIn |
Wolf-Gerrit Fruh, Angus Creech, Eoghan Maguire |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087604
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| Publikation (Nr.) |
 EGU/EGU2014-1662.pdf |
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| Zusammenfassung |
| The effect of wind turbine wakes in large offshore wind energy arrays can be a
substantial factor in affecting the performance of turbines inside the array. Turbulent
mixing plays a key role in the wake recovery, having a significant effect on the
length over which the wake is strong enough to affect the performance other turbines
significantly.
We aim to highlight how turbulence affects wind turbine wakes, first by examining a high
resolution CFD model of a single turbine wake validated by LIDAR measurements [1], and
secondly with a much larger CFD simulation of Lillgrund offshore wind farm, validated with
SCADA data [2].
By comparing the decay rates behind single turbines in environments of different
surrounding surface features, ranging from ideal free-slip wind tunnels to mixed-vegetation
hills, we suggest that the decay rate of turbine wakes are enhanced by free-stream turbulence,
created by topography and ground features.
In the context of Lillgrund wind farm, observations and computational results suggest that
the wakes created by the turbines in the leading row facing the wind decay much slower than
those in second row, or further into the turbine array. This observation can be explained by
the diffusive action of upwind turbulence breaking up the wake generated by a turbine
rotor.
Angus CW Creech, Wolf-Gerrit Früh, Peter Clive (2012). Actuator volumes and
hradaptive methods for threedimensional simulation of wind turbine wakes and
performance. Wind Energy Vol.15, 847 – 863.
Angus C.W. Creech, Wolf-Gerrit Früh, A. Eoghan Maguire (2013).
High-resolution CFD modelling of Lillgrund Wind farm. Renewable Energies
and Power Quality Journal, Vol.11 |
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