A numerical study of species transport budgets in a turbulent lifted flame

Shahram Karami, Mohsen Talei, Evatt R. Hawkes

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

A turbulent lifted slot-jet flame is studied using direct numerical simulation (DNS). A one-step chemistry model was employed with a mixture-fraction dependent activation energy which can reproduce qualitatively the dependence of laminar burning rate on equivalence ratio that is typical of hydrocarbon fuels. Terms in the transport equation of Favre-averaged product mass fraction were examined to determine their relative contributions and thus help understand the structure of the flame and its mechanism of stabilisation. It was found that the leading edge has features which are expected of a turbulent premixed flame, namely streamwise convection balancing turbulent transport upstream; however transverse mean convection due to entrainment and transverse turbulent transport out of the flame were both significant. Downstream, reaction became a dominant term and the flame has features expected of a non-premixed jet flame. The entrainment flows were found to be significant, and divergence of streamlines around the flame base was found to lead to local mean velocities that were actually in the upstream direction, a feature which may be dynamically important in the flame stabilisation.
Original languageEnglish
Title of host publicationAustralian Combustion Symposium 2013 Proceedings
EditorsMingming Zhu, Yu Ma, Yun Yu, Hari Vuthaluru, Zhezi Zhang, Dongke Zhang
Place of PublicationNSW Australia
PublisherMacquarie University
Pages162-165
Number of pages4
Publication statusPublished - Nov 2013
Externally publishedYes
EventAustralian Combustion Symposium 2013 - Perth, Australia
Duration: 6 Nov 20138 Nov 2013

Publication series

NameAustralian Combustion Symposium
PublisherAustralian Combustion Symposium
ISSN (Print)1839-8170
ISSN (Electronic)1839-8162

Conference

ConferenceAustralian Combustion Symposium 2013
CountryAustralia
CityPerth
Period6/11/138/11/13

Keywords

  • Direct numerical simulation (DNS)
  • Partially premixed lifted flame
  • Turbulence

Cite this

Karami, S., Talei, M., & Hawkes, E. R. (2013). A numerical study of species transport budgets in a turbulent lifted flame. In M. Zhu, Y. Ma, Y. Yu, H. Vuthaluru, Z. Zhang, & D. Zhang (Eds.), Australian Combustion Symposium 2013 Proceedings (pp. 162-165). (Australian Combustion Symposium). Macquarie University.