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Long-wave instabilities of two interlaced helical vortices
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9446-7477
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7864-3071
2016 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 753, no 3, article id 032022Article in journal (Refereed) Published
Abstract [en]

We present a comparison between experimental observations and theoretical predictions concerning long-wave displacement instabilities of the helical vortices in the wake of a two-bladed rotor. Experiments are performed with a small-scale rotor in a water channel, using a set-up that allows the individual triggering of various instability modes at different azimuthal wave numbers, leading to local or global pairing of successive vortex loops. The initial development of the instability and the measured growth rates are in good agreement with the predictions from linear stability theory, based on an approach where the helical vortex system is represented by filaments. At later times, local pairing develops into large-scale distortions of the vortices, whereas for global pairing the non-linear evolution returns the system almost to its initial geometry.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2016. Vol. 753, no 3, article id 032022
Keywords [en]
Forecasting, Torque, Wakes, Wind power, Azimuthal wave number, Displacement instability, Initial development, Instability modes, Linear stability theory, Longwave instability, Nonlinear evolutions, Scale distortion, Vortex flow
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-201776DOI: 10.1088/1742-6596/753/3/032022Scopus ID: 2-s2.0-84995520556OAI: oai:DiVA.org:kth-201776DiVA, id: diva2:1075756
Conference
5 October 2016 through 7 October 2016
Note

QC 20170221

Available from: 2017-02-21 Created: 2017-02-21 Last updated: 2017-11-29Bibliographically approved

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Brynjell-Rahkola, MattiasHenningson, Dan Stefan
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  • apa
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  • vancouver
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