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Comparison between experiments and Large-Eddy Simulations of tip spiral structure and geometry
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. Uppsala University, Sweden.
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2015 (English)In: WAKE CONFERENCE 2015, 2015, Vol. 625, 012018Conference paper (Refereed)
Abstract [en]

Results from Large-Eddy Simulations using the actuator line technique have been validated against experimental results. The experimental rotor wake, which forms the basis for the comparison, was studied in a recirculating free-surface water channel, where a helical vortex was generated by a single-bladed rotor mounted on a shaft. An investigation of how the experimental blade geometry and aerofoil characteristics affect the results was performed. Based on this, an adjustment of the pitch setting was introduced, which is still well within the limits of the experimental uncertainty. Excellent agreement between the experimental and the numerical results was achieved concerning the circulation, wake expansion and pitch of the helical tip vortex. A disagreement was found regarding the root vortex position and the axial velocity along the centre line of the tip vortex. This work establishes a good base for further studies of more fundamental stability parameters of helical rotor wakes.

Place, publisher, year, edition, pages
2015. Vol. 625, 012018
, Journal of Physics Conference Series, ISSN 1742-6588
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-172190DOI: 10.1088/1742-6596/625/1/012018ISI: 000358047700018OAI: diva2:846534
Wake Conference, JUN 09-11, 2015, Visby, SWEDEN

QC 20150817

Available from: 2015-08-17 Created: 2015-08-14 Last updated: 2015-08-17Bibliographically approved

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Ivanell, Stefan
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Stability, Transition and Control
Energy Engineering

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