Evolution and breakdown of helical vortex wakes behind a wind turbine

A. Nemes, M. Sherry, D. Lo Jacono, H. M. Blackburn, J. Sheridan

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

Abstract

The wake behind a three-bladed Glauert model rotor in a water channel was investigated. Planar particle image velocimetry was used to measure the velocity fields on the wake centre-line, with snapshots phase-locked to blade position of the rotor. Phase- locked averages of the velocity and vorticity fields are shown, with tip vortex interaction and entanglement of the helical filaments elucidated. Proper orthogonal decomposition and topology-based vortex identification are used to filter the PIV images for coherent structures and locate vortex cores. Application of these methods to the instantaneous data reveals unsteady behaviour of the helical filaments that is statistically quantifiable.

Original languageEnglish (US)
Article number012077
JournalJournal of Physics: Conference Series
Volume555
Issue number1
DOIs
StatePublished - 2014
Event4th Scientific Conference on the Science of Making Torque from Wind - Oldenburg, Germany
Duration: Oct 9 2012Oct 11 2012

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