Effects of preheating and dilution on lean premixed methane/air flame characteristics

Document Type

Conference Proceeding

Publication Date

1-1-2014

Abstract

Due to high efficiency and low emission levels, lean premixed flames are of considerable interest in combustion research. This work seeks to identify progressions of characteristics that are common to premixed flames with varying stoichiometry and inlet temperature, where both non-adiabatic and diluted cases are considered. Databases for large numbers of 1D CH4/air flames are obtained from numerical simulations with detailed chemistry, where information on dominant chemical modes is derived from a chemical explosive mode analysis (CEMA). In this context, the cross-over point where the dominant explosive mode changes to a non-explosive mode is of particular interest. Results suggest that the temperature at the cross-over point is primarily a function of the final flame temperature, implying that flames with similar flame temperatures follow the same behavior regardless of inlet conditions. The analysis reveals comparable trends for both adiabatic and non-adiabatic cases. In addition to combustion with standard air as the oxidizer, the impact of varying amounts of N2is studied in order to verify the principal role of flame temperature in premixed methane/air combustion.

Publication Source (Journal or Book title)

Western States Section of the Combustion Institute Spring Technical Meeting 2014

First Page

426

Last Page

435

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