A comprehensive evaluation of soret diffusion in heptane-air flames

Y. X. Xin, C. J. Sung, C. K. Law

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

Abstract

The influence of Soret diffusion on the structure and response of n-heptane/air flames is investigated numerically with detailed reaction mechanism and transport. Unstretched freely-propagating planar premixed flames as well as stretched counterflow premixed and diffusion flames are studied, with emphasis on the separate and combined Soret effects of heptane and its oppositely-directed decomposition species H2 and H, as well as those of the major species O2, N2, CO2 and H2O. Results show that, in the unstretched case for which the flame temperature remains at its adiabatic value, Soret diffusion primarily affects the chemical kinetics embedded in the flame structure and the net effect is small; while in the stretched cases, its impact is mainly through those of heptane and the secondary fuel H2 in modifying the flame temperature, with substantial effects, while H2 and H also affect the chemical kinetics especially when the active reaction zone is localized. The dilution/enrichment of the reactant concentrations in the flame through the Soret diffusion of the major species O2, N2, CO2 and H2O further exert finite effects on the flame burning intensity.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
PublisherCombustion Institute
Pages451-463
Number of pages13
ISBN (Electronic)9781622761258
StatePublished - Jan 1 2011
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 - Storrs, United States
Duration: Oct 9 2011Oct 12 2011

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011

Other

OtherFall Technical Meeting of the Eastern States Section of the Combustion Institute 2011
CountryUnited States
CityStorrs
Period10/9/1110/12/11

All Science Journal Classification (ASJC) codes

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

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  • Cite this

    Xin, Y. X., Sung, C. J., & Law, C. K. (2011). A comprehensive evaluation of soret diffusion in heptane-air flames. In Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011 (pp. 451-463). (Fall Technical Meeting of the Eastern States Section of the Combustion Institute 2011). Combustion Institute.