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Flow Structure Generation by Multiple Jets in Supersonic Cross-Flow
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7715-863X
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7330-6965
University of Cincinnati.
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2013 (English)In: 4th International Conference on Jets, Wakes and Separated Flows, ICJWSF2013, 2013Conference paper, Published paper (Refereed)
Abstract [en]

The flow structure generation by multiple jets impinging a supersonic crossflow in the divergent section of a Convergent-Divergent (C-D) duct is investigated using compressible Large Eddy Simulations (LES). The supersonic flow-field in the C-D duct is mainly characterized by the evolving shock-structure. The effect of increasing the compressible jet to crossflow velocity ratio R to the generation of flow structures and the ability to modify the shock-pattern in the duct was studied. Traversing R, the shock-pattern can be significantly altered. This paper demonstrates that for close located jets in crossflow the vortical structures generated by the jets can interact and give rise to vortical structures in the interspace plane between the jets. The spectra for different probes are shown illustrating the characteristic flow frequencies. For all simulated cases the spectra show peaks for a defined Strouhal-number of 0.5. The jets choke in the crossflow above an R of about 0.65, which results in a faster disruption of the coherent flow structures induced by the jets. The flow field is analyzed using Proper Orthogonal Decomposition (POD).

Place, publisher, year, edition, pages
2013.
Keyword [en]
Compressible Flow, Nozzle Flow
National Category
Fluid Mechanics and Acoustics
Research subject
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-148027OAI: oai:DiVA.org:kth-148027DiVA: diva2:734335
Conference
4th International Conference on Jets, Wakes and Separated Flows, ICJWSF2013,September 17-21, 2013, Nagoya, JAPAN
Note

QC 20140819

Available from: 2014-07-16 Created: 2014-07-16 Last updated: 2015-03-05Bibliographically approved

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Semlitsch, BernhardMihaescu, Mihai

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