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Turbulence Enhancement in Coaxial Jet Flows by Means of Vortex Shedding
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1663-3553
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8667-0520
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2009 (English)In: PROGRESS IN TURBULENCE III / [ed] Peinke, J.; Oberlack, M.; Talamelli, A., 2009, Vol. 131, 235-238 p.Conference paper, Published paper (Refereed)
Abstract [en]

Over the past decades a variety of passive and active flow control mechanisms have been tested and applied in a variety of canonical as well as applied flow cases. An example for the latter is the coaxial jet flow, which has mainly been investigated regarding the receptivity to active flow control strategies (see e.g. [1]), probably due to the multitude of parameters characterising the complex flow field [2]. Physical and numerical experiments (see e.g. [3] and [5]) have established that the vortical motion in coaxial jet flows is dominated by the vortices emerging from the outer shear layer. The frequency of these vortices is related to the Kelvin- Helmholtz instability as predicted by linear stability analysis for single jets. The vortices in the inner shear layer, on the other hand, are trapped in the spaces left free between two consecutive outer shear layer vortices, and are therefore sharing the frequencies of the most amplified modes of the outer shear layer and do not relate to the values one would expect from linear stability analysis. This fact has become known as the “locking phenomenon”, which describes the mutual interaction of both shear layers. Nevertheless it is believed that only the outer shear layer is able to significantly control the evolution of the inner shear layer [7], which may explain the focus of control strategies on the outer shear layer.

Place, publisher, year, edition, pages
2009. Vol. 131, 235-238 p.
Series
Springer Proceedings in Physics, ISSN 0930-8989 ; 131
Keyword [en]
NEAR-FIELD
National Category
Mechanical Engineering Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-27128DOI: 10.1007/978-3-642-02225-8_57ISI: 000283758200057ISBN: 978-3-642-02224-1 (print)OAI: oai:DiVA.org:kth-27128DiVA: diva2:375101
Conference
Proceedings of the iTi Conference in Turbulence 2008, Bertinoro, ITALY, OCT 12-15, 2008
Note

QC 20101207

Available from: 2010-12-07 Created: 2010-12-06 Last updated: 2016-05-18Bibliographically approved

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Örlü, RamisSegalini, AntonioAlfredsson, P. Henrik

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