Offshore and onshore wind turbine wake meandering studied in an ABL wind tunnel

Emre Barlas, Sophia Buckingham, Gertjan Glabeke, Jeroen van Beeck

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Abstract

Scaled wind turbine models have been installed in the VKI L1-B atmospheric boundary layer wind tunnel at offshore and onshore conditions. Time-resolved measurements were carried out with three component hot wire anemometry and stereo-PIV in the middle vertical plane of the wake up to eleven turbine diameter downstream. The results show an earlier wake recovery for the onshore case. The effect of inflow conditions and the wind turbine’s working conditions on wake meandering was investigated. Wake meandering was detected by hot wire anemometry through a low frequency peak in the turbulent power spectrum, present in the entire wake mainly for offshore inflow condition. It was found that the Strouhal number, based on the rotor diameter and the wind velocity at hub height, was in the order of 0.25.
Below the meandering frequency, turbulence power spectrum decreased, whereas above it increased. Wake meandering did not persist strongly further downstream in the wind farm layout studied.
Original languageEnglish
Title of host publicationProceedings. International Workshop on Physical Modeling of Flow and Dispersion Phenomena (PHYSMOD)
Number of pages7
Publication date2015
Publication statusPublished - 2015
EventInternational Workshop on Physical Modeling of Flow and Dispersion Phenomena - Zürich, Switzerland
Duration: 7 Sep 20159 Sep 2015

Conference

ConferenceInternational Workshop on Physical Modeling of Flow and Dispersion Phenomena
CountrySwitzerland
CityZürich
Period07/09/201509/09/2015

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