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Transient laminar flame propagation in confined premixed gases: Numerical predictions

Authors
Journal
Symposium (International) on Combustion
0082-0784
Publisher
Elsevier
Publication Date
Volume
17
Issue
1
Identifiers
DOI: 10.1016/s0082-0784(79)80125-3
Keywords
  • Combustion Oscillations
Disciplines
  • Chemistry
  • Mathematics
  • Musicology
  • Physics

Abstract

A model is developed for ignition and laminar flame propagation in premixed gases confined in a closed chamber. Predictions follow from a numerical solution to the one-dimensional compressible Navier-Stokes Equations. The solution procedure properly accounts for multispecies diffusion, finite-rate chemical reactions, and interaction of the combustion wave with the confining geometry. A prediction of the flammability limit in ozone/oxygen is consistent with experimental data. Computations, for a mixture of 18 mole % O 3 in O 2 indicate that the confined flame (1) remains far from chemical equilibrium, (2) pulsates with significant amplitude at a slowly increasing frequency predicted by Jost's acoustic analysis, and (3) accelerates to speeds which are an order of magnitude greater than a steady state flame at the pressure levels involved.

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