CUED Publications database

The structure of turbulent stratified and premixed methane/air flames II: Swirling flows

Sweeney, MS and Hochgreb, S and Dunn, MJ and Barlow, RS (2012) The structure of turbulent stratified and premixed methane/air flames II: Swirling flows. Combustion and Flame, 159. pp. 2912-2929. ISSN 0010-2180

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Abstract

Experimental results are presented from a series of turbulent methane/air stratified flames stabilized on a swirl burner. Nine operating conditions are considered, systematically varying the level of stratification and swirl while maintaining a lean global mean equivalence ratio of φ̄=0.75. Scalar data are obtained from Rayleigh/Raman/CO laser induced fluorescence (CO-LIF) line measurements at 103μm resolution, allowing the behavior of the major combustion species-CH 4, CO 2, CO, H 2, H 2O and O 2-to be probed within the instantaneous flame front. The corresponding three-dimensional surface density function and thermal scalar dissipation rate are investigated, along with geometric characteristics of the flame such as curvature and flame thickness. Hydrogen and carbon monoxide levels within the flame brush are raised by stratification, indicating models with laminar premixed flame chemistry may not be suitable for stratified flames. However, flame surface density, scalar dissipation and curvature all appear insensitive to the degree of stratification in the flames surveyed. © 2012 The Combustion Institute.

Item Type: Article
Uncontrolled Keywords: Co-annular jet burner Laser diagnostics Lean stratified combustion Scalar dissipation rate Turbulent combustion
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:51
Last Modified: 08 Dec 2014 02:21
DOI: 10.1016/j.combustflame.2012.05.014