Stability analysis of the tip vortices of a wind turbine
2010 (English)In: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 13, no 8, 705-715 p.Article in journal (Refereed) Published
The aim of the present project is to obtain a better understanding of thestability properties of wakes generated by wind turbine rotors. To accomplishthis a numerical study on the stability of the tip vortices of the Tjaereborgwind turbine has been carried out. The numerical model is based on large eddysimulations of the Navier-Stokes equations using the actuator line method togenerate the wake and the tip vortices. To determine critical frequencies theflow is disturbed by inserting harmonic perturbations.The results show that the instability is dispersive and that growth arisesonly for some specific frequencies and type of modes. The study also providesevidence of a relationship between the turbulence intensity and the length ofthe near wake. The relationship however needs to be calibrated against measurements.
Place, publisher, year, edition, pages
2010. Vol. 13, no 8, 705-715 p.
wakes, CFD, EllipSys3D, wake length, Horns Rev, Actuator line, Harmonic perturbations, Wind turbines
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-9911DOI: 10.1002/we.391ISI: 000285314400002ScopusID: 2-s2.0-78649637517OAI: oai:DiVA.org:kth-9911DiVA: diva2:158163
FunderSwedish e‐Science Research Center
Uppdaterad från submitted till published 20100720 QC 201007202009-01-302009-01-302014-11-07Bibliographically approved