The transition from deflagration to detonation in thin channels

A numerical study of a two-dimensional model for premixed gas combustion in a thin, semi-infinite and thermally-insulated channel is performed. The work is motivated by recent theoretical advances revealing the important role of hydraulic resistance in deflagration-to-detonation transition, one of t...

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Bibliographic Details
Published in:Combustion and flame 2003-09, Vol.134 (4), p.389-397
Main Authors: Kagan, L., Sivashinsky, G.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion. Flame
Deflagration
Deflagration-to-detonation transition
Detonation
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Theoretical studies
Theoretical studies. Data and constants. Metering
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Summary:A numerical study of a two-dimensional model for premixed gas combustion in a thin, semi-infinite and thermally-insulated channel is performed. The work is motivated by recent theoretical advances revealing the important role of hydraulic resistance in deflagration-to-detonation transition, one of the central yet still poorly understood phenomena of gaseous combustion. The two-dimensional formulation reproduces the formation of the so-called tulip flame and its predetonational acceleration, well-known experimentally but unattainable within the quasi-one-dimensional approach employed previously. It is shown that the detonation first develops in the boundary layer where the effect of hydraulic resistance is stronger, and thereupon spreads over the channel's interior. However, the second stage of the transition does not proceed gradually but rather through a localized auto-ignition within the tulip.
ISSN:0010-2180
1556-2921
DOI:10.1016/S0010-2180(03)00138-X