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Flow-flame interaction in a closed chamber
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2008 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 20, no 5, 055107-055121 p.Article in journal (Refereed) Published
Abstract [en]

Numerous studies of flame interaction with a single vortex andrecent simulations of burning in vortex arrays in open tubesdemonstrated the same tendency for the turbulent burning rate$\propto U_{rms}\lambda^{2/3}$, where  $U_{rms}$ is theroot-mean-square velocity and $\lambda$ is the vortex size. Here itis demonstrated that this tendency is not universal for turbulentburning. Flame interaction with vortex arrays is investigated forthe geometry of a closed burning chamber using direct numericalsimulations of the complete set of gas-dynamic combustion equations.Various initial conditions in the chamber are considered, includinggas at rest and several systems of vortices of different intensitiesand sizes. It is found that the burning rate in a closed chamber(inverse burning time) depends strongly on the vortex intensity; atsufficiently high intensities it increases with $U_{rms}$approximately linearly in agreement with the above tendency. On thecontrary, dependence of the burning rate on the vortex size isnon-monotonic and qualitatively different from the law$\lambda^{2/3}$. It is shown that there is an optimal vortex size ina closed chamber, which provides the fastest total burning rate. Inthe present work the optimal size is 6 times smaller than thechamber height.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2008. Vol. 20, no 5, 055107-055121 p.
Keyword [en]
flame, flow, turbulence
National Category
Fluid Mechanics and Acoustics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-23082DOI: 10.1063/1.2919807OAI: oai:DiVA.org:umu-23082DiVA: diva2:219624
Available from: 2009-05-28 Created: 2009-05-28 Last updated: 2013-02-04Bibliographically approved

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Bychkov, Vitaly

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