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Fuel jet mixing enhanced by intermittent injection
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-7729-3484
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2013 (English)In: 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013, American Institute of Aeronautics and Astronautics, 2013Conference paper, Published paper (Refereed)
Abstract [en]

The paper considers the effects of intermittent injection of a fuel spray on the initial break-up and mixing of the fuel with the surrounding "ambient" fluid. The two fluids may have the same phase or different phases. The aim of the analysis is to describe the physical process and indicate the mechanisms that control the mixing under different flow conditions (time-dependent injection and its frequency relative to the time scales of the flow) and fluid properties (Schmidt number in the single phase case or the Weber number for liquid fuel case. The computations use Large Eddy Simulation (LES) for accounting for turbulence and either Volume Of Fluid (VOF) for the initial break-up and Lagrangian Particle Tracking (LPT) with droplet break-up model in the case of liquid droplets injected into the ambient gas. The results show that depending on the physical properties of the fuel and ambient gas, the initial break-up and turbulent mixing can be enhanced substantially with intermittent injection. Most of the mixing is driven by the suction of ambient fluid at the tail of the injected fuel (as was shown experimentally and in a one dimensional model by Musculus and co-workers).

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2013.
Keyword [en]
Intermittent injection, Lagrangian particle tracking, Liquid droplets, One-dimensional model, Physical process, Schmidt numbers, Turbulent mixing, Volume of fluids
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-133870Scopus ID: 2-s2.0-84881467874ISBN: 978-162410181-6 (print)OAI: oai:DiVA.org:kth-133870DiVA: diva2:663800
Conference
51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013; Grapevine, TX; United States; 7 January 2013 through 10 January 2013
Note

QC 20131113

Available from: 2013-11-13 Created: 2013-11-11 Last updated: 2016-05-04Bibliographically approved

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Nygård, Alexander

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