Direct numerical simulation of stationary lean premixed methane-air flames under intense turbulence

Ramanan Sankaran, Evatt R. Hawkes, Chun S. Yoo, Jacqueline H. Chen, Tianfeng Lu, Chung K. Law

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

2 Scopus citations

Abstract

Direct numerical simulation of a three-dimensional spatially-developing turbulent Bunsen flame has been performed at three different turbulence intensities. The simulations are performed using a reduced methane-air chemical mechanism which is specifically tailored for the lean premixed conditions simulated here. A planar-jet turbulent Bunsen flame configuration is used in which turbulent preheated methane-air mixture at 0.7 equivalence ratio issues through a central jet and is surrounded by a hot laminar coflow of burned products. The turbulence characteristics at the jet inflow are selected such that combustion occurs in the thin reaction zones (TRZ) regime. At the lowest turbulence intensity the conditions fall on the boundary between the TRZ regime and the corrugated flamelet regime. At the highest turbulence intensity the conditions correspond to the boundary between the TRZ regime and the broken reaction zones regime. The data from the three simulations is analyzed to understand the effect of turbulent stirring on the flame structure and thickness. Statistical analysis of the data shows that the thermal preheat layer of the flame is thickened due to the action of turbulence, but the reaction zone is not significantly affected.

Original languageEnglish (US)
Title of host publication5th US Combustion Meeting 2007
PublisherCombustion Institute
Pages625-637
Number of pages13
ISBN (Electronic)9781604238112
StatePublished - Jan 1 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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  • Cite this

    Sankaran, R., Hawkes, E. R., Yoo, C. S., Chen, J. H., Lu, T., & Law, C. K. (2007). Direct numerical simulation of stationary lean premixed methane-air flames under intense turbulence. In 5th US Combustion Meeting 2007 (pp. 625-637). (5th US Combustion Meeting 2007; Vol. 1). Combustion Institute.