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Physical mechanism of ultrafast flame acceleration
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Chalmers, Dept Appl Mech, S-41296 Gothenburg, Sweden.
2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 16, 164501- p.Article in journal (Refereed) Published
Abstract [en]

We explain the physical mechanism of ultra-fast flame accelerationin obstructed channels used in modern experiments on detonationtriggering.  It is demonstrated that delayed burning between theobstacles creates a powerful jet-flow, driving the acceleration.This mechanism is much stronger than the classical Shelkinscenario of flame acceleration due to non-slip at the channelwalls.  The mechanism under study isindependent of the Reynolds number, with turbulence playing only asupplementary role. The flame front accelerates exponentially; theanalytical formula for the growth rate is obtained. The theory isvalidated by extensive direct numerical simulations and comparisonto previous experiments.

Place, publisher, year, edition, pages
2008. Vol. 101, no 16, 164501- p.
Keyword [en]
FLOW, deflagration, detonation, DDT
Identifiers
URN: urn:nbn:se:umu:diva-23083DOI: 10.1103/PhysRevLett.101.164501OAI: oai:DiVA.org:umu-23083DiVA: diva2:219632
Available from: 2009-05-28 Created: 2009-05-28 Last updated: 2017-12-13

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevLett.101.164501

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