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Long-wave instabili...
Long-wave instabilities of two interlaced helical vortices
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Quaranta, H. U. (författare)
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- Brynjell-Rahkola, Mattias (författare)
- KTH,Linné Flow Center, FLOW,Mekanik
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Leweke, T. (författare)
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visa fler...
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- Henningson, Dan Stefan (författare)
- KTH,Linné Flow Center, FLOW,Mekanik
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visa färre...
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(creator_code:org_t)
- 2016-10-01
- 2016
- Engelska.
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Ingår i: Journal of Physics, Conference Series. - : Institute of Physics (IOP). - 1742-6588 .- 1742-6596. ; 753:3
- Relaterad länk:
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https://doi.org/10.1...
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visa fler...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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visa färre...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- 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
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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