Direct numerical simulation of soot formation and transport in non-premixed turbulent ethylene flames

D. O. Lignell, J. H. Chen, P. J. Smith, T. F. Lu, C. K. Law

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Direct numerical simulations of two-dimensional, nonpremixed, sooting ethylene flames are presented to examine the effects of soot-flame interactions and transport in a turbulent configuration. A 15 step, 19 species reduced mechanism was used for gas chemistry, with a two-moment, four-step soot model. Flame curvature is shown to result in flames that move, relative to the fluid, either towards, or away from rich soot formation regions, resulting in soot being essentially convected into or away from the flame and transported in the mixture fraction coordinate. In regions where the flame motion relative to convection is towards the fuel stream, soot is located nearer the flame at higher temperatures, hence having higher reaction rates and radiative heat fluxes. Soot-flame breakthrough was also observed in these regions. Fluid convection and flame displacement velocity relative to fluid convection are of similar magnitudes while the thermophoretic velocity is five to ten times lower. These results emphasize the importance of both unsteady and multidimensional effects on soot formation and transport in turbulent flames.

Original languageEnglish (US)
Title of host publication5th US Combustion Meeting 2007
PublisherCombustion Institute
Pages520-554
Number of pages35
ISBN (Electronic)9781604238112
StatePublished - 2007
Event5th US Combustion Meeting 2007 - San Diego, United States
Duration: Mar 25 2007Mar 28 2007

Publication series

Name5th US Combustion Meeting 2007
Volume1

Other

Other5th US Combustion Meeting 2007
CountryUnited States
CitySan Diego
Period3/25/073/28/07

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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