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Main Instabilities of Coaxial Jets
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. Royal Inst Technol, KTH Mech, Linne FLOW Ctr, SE-10044 Stockholm, Sweden..ORCID iD: 0000-0001-8667-0520
Univ Bologna, Dept Mech & Aerosp Engn DIEM, I-47100 Forli, Italy..
2012 (English)In: PROGRESS IN TURBULENCE AND WIND ENERGY IV / [ed] Oberlack, M Peinke, J Talamelli, A Castillo, L Holling, M, SPRINGER-VERLAG BERLIN , 2012, p. 139-142Conference paper, Published paper (Refereed)
Abstract [en]

An experimental analysis of the dominant instabilities in the initial merging region of two coaxial jets is presented. Different inner/outer jet velocity pairs (U-i,U-o) have been tested in order to investigate the effect of both velocity ratio r(u) = U-o/U-i and Reynolds number in the instability characteristics. Three main instabilities have emerged depending on the velocity ratio. For r(u) < 0.75 the coaxial jets dynamic is driven by the inner shear layer. For r(u) > 1.6 the outer shear layer dominates the near field vortex dynamics, while for velocity ratios nearly unitary the vortex shedding behind the separating wall imposes its own dynamics.

Place, publisher, year, edition, pages
SPRINGER-VERLAG BERLIN , 2012. p. 139-142
Series
Springer Proceedings in Physics, ISSN 0930-8989 ; 141
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-245335ISI: 000392536300029ISBN: 978-3-642-28968-2 (print)OAI: oai:DiVA.org:kth-245335DiVA, id: diva2:1295166
Conference
4th Interdisciplinary Turbulence Initiative (ITI) Conference, 2010, Bertinoro, ITALY
Note

QC 20190311

Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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Segalini, Antonio

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