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Long-wave instabilities of two interlaced helical vortices
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för teknikvetenskap (SCI), Mekanik.ORCID-id: 0000-0001-9446-7477
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för teknikvetenskap (SCI), Mekanik.ORCID-id: 0000-0001-7864-3071
2016 (engelsk)Inngår i: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 753, nr 3, artikkel-id 032022Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Institute of Physics (IOP), 2016. Vol. 753, nr 3, artikkel-id 032022
Emneord [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
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-201776DOI: 10.1088/1742-6596/753/3/032022ISI: 000436325700083Scopus ID: 2-s2.0-84995520556OAI: oai:DiVA.org:kth-201776DiVA, id: diva2:1075756
Konferanse
5 October 2016 through 7 October 2016
Merknad

QC 20170221

Tilgjengelig fra: 2017-02-21 Laget: 2017-02-21 Sist oppdatert: 2019-10-17bibliografisk kontrollert

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Brynjell-Rahkola, MattiasHenningson, Dan Stefan
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