Enhancing Wind Energy Assessment and Optimization through Airborne Observations: Insights from Onshore and Offshore Measurements

DSpace Repository

Show simple item record

dc.contributor.advisor Bange, Jens (Prof. Dr.)
dc.contributor.author zum Berge, Kjell
dc.date.accessioned 2024-05-17T09:49:38Z
dc.date.available 2024-05-17T09:49:38Z
dc.date.issued 2024-12-31
dc.identifier.uri http://hdl.handle.net/10900/153515
dc.identifier.uri http://nbn-resolving.de/urn:nbn:de:bsz:21-dspace-1535157 de_DE
dc.identifier.uri http://dx.doi.org/10.15496/publikation-94854
dc.description.abstract The expansion of wind energy is set to increase significantly over the next few years. This will lead to challenges both onshore and offshore, such as the influence of wind farms on downstream wind farms in the German Bight or the change of the wind field of wind turbines in complex terrain. This thesis investigates the influence of orography on the wind field in a wind energy test site in the Swabian Alb and the effects of wakes from large wind farm clusters on downstream wind turbines in the German Bight. The measurements carried out with crewed and uncrewed aerial systems (UAS) are also used to validate and compare model data. Complex terrain, such as small hills or the edges of slopes, changes the flow considerably. Above the highest point of the obstacle, there is an increase in wind speed, known as a speed-up. In addition, recirculation zones can form downstream of the elevation.Both of these often lead to strong shear (turbulence) at the boundary between the flow that is accelerated by the slope and the flow that is slowed down below it. The lower part of modern wind turbines is usually located in this height range. The roughness of the slope surface also has an effect. For example, if the slope is overgrown with forest, this will further increase turbulence and flow velocity and therefore affect the yield and life time of wind turbines in such areas. In this work, flight measurements with the UAS MASC-3 (Multi-Purpose Airborne Sensor Carrier, Version 3) are presented to analyse the wind field over a 200~m high slope and compared with a model chain consisting of a WRF (Weather Research and Forecast) model and an openFOAM (Open Source Field Operation and Manipulation) model. The results show that there is a significant increase in wind speed over the highest point of the west-facing slope, in the area of the future research wind turbines (FWEA). The resulting shear also increases the turbulent kinetic energy (TKE) at the lowest measurement heights many times compared to the undisturbed flow at 200 m above ground. The seasonal influence, i.e. the presence or absence of foliage cover on the slope, is clearly evident. Both velocity and TKE are higher in summer. The model chain simulated the wind field above the slope edge in two case studies with good agreement. Based on flight measurements with the crewed aircraft D-IBUF of the TU Braunschweig over the German Bight to investigate the wake effects of large wind farm clusters and their influence on downstream wind farms, the industrial model FOXES (Farm Optimisation and eXtended yield Evaluation Software) is compared in different configurations. The measurement results show clearly pronounced wake effects under stable atmospheric conditions. In comparison, the simulation results show good results in the immediate vicinity downstream of the wind farm clusters. The model quality decreases with increasing distance to the wind farms. en
dc.description.abstract Die Dissertation ist gesperrt bis zum 31. Dezember 2024 ! de_DE
dc.language.iso en de_DE
dc.publisher Universität Tübingen de_DE
dc.rights ubt-podok de_DE
dc.rights cc_by-nc-nd de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=de de_DE
dc.rights.uri http://tobias-lib.uni-tuebingen.de/doku/lic_mit_pod.php?la=en en
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.de de_DE
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.en en
dc.subject.ddc 333.7 de_DE
dc.subject.ddc 500 de_DE
dc.subject.ddc 550 de_DE
dc.subject.ddc 620 de_DE
dc.subject.other Windenergie de_DE
dc.subject.other Unbemannte Flugsysteme de_DE
dc.subject.other UAS en
dc.subject.other Atmospheric Physics en
dc.subject.other Atmosphärenphysik de_DE
dc.subject.other Measurement en
dc.subject.other Turbulenz de_DE
dc.subject.other Messtechnik de_DE
dc.subject.other Turbulence en
dc.subject.other Wind Energy en
dc.title Enhancing Wind Energy Assessment and Optimization through Airborne Observations: Insights from Onshore and Offshore Measurements en
dc.type PhDThesis de_DE
dcterms.dateAccepted 2024-04-24
utue.publikation.fachbereich Geographie, Geoökologie, Geowissenschaft de_DE
utue.publikation.fakultaet 7 Mathematisch-Naturwissenschaftliche Fakultät de_DE
utue.publikation.noppn yes de_DE


This item appears in the following Collection(s)

Show simple item record