Physical Mechanism of Ultrafast Flame Acceleration
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 101, no 16, 164501-1-164501-4 p.Article in journal (Refereed) Published
We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments.
Place, publisher, year, edition, pages
2008. Vol. 101, no 16, 164501-1-164501-4 p.
Computer simulation, Direct numerical simulation, Reynolds number, Analytical formulas, Channel walls, Flame accelerations, Flame fronts, Physical mechanisms, Ultrafast
IdentifiersURN: urn:nbn:se:kth:diva-9148DOI: 10.1103/PhysRevLett.101.164501ISI: 000260141300023ScopusID: 2-s2.0-54849405187OAI: oai:DiVA.org:kth-9148DiVA: diva2:25287
QC 20100915. Uppdaterad från submitted till published (20100915).2008-09-242008-09-242010-09-16Bibliographically approved