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Title: Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene

Abstract

The ignition temperature of nitrogen-diluted mixtures of methane and ethylene counterflowing against heated air was measured up to five atmospheres. In addition, the stretch-corrected laminar flame speeds of mixtures of air, methane and ethylene were determined from outwardly-propagating spherical flames up to 10 atmospheres, for extensive range of the lean-to-rich equivalence ratio. These experimental data, relevant to low- to moderately-high-temperature ignition chemistry and high-temperature flame chemistry, respectively, were subsequently compared with calculations using two detailed kinetic mechanisms. A chemical explosive mode analysis (CEMA) was then conducted to identify the dominant ignition chemistry and the role of ethylene addition in facilitating nonpremixed ignition. Furthermore, the hierarchical structure of the associated oxidation kinetics was examined by comparing the sizes and constituents of the skeletal mechanisms of the pure fuels and their mixtures, derived using the method of directed relation graph (DRG). The skeletal mechanism was further reduced by time-scale analysis, leading to a 24-species reduced mechanism from the detailed mechanism of USC Mech II, validated within the parameter space of the conducted experiments. (author)

Authors:
; ;  [1]
  1. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)
Publication Date:
OSTI Identifier:
21305719
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 157; Journal Issue: 5; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ETHYLENE; METHANE; LAMINAR FLAMES; MIXTURES; IGNITION; TEMPERATURE RANGE 1000-4000 K; AIR; EXPERIMENTAL DATA; SPHERICAL CONFIGURATION; COUNTERFLOW SYSTEMS; NITROGEN; CHEMICAL REACTIONS; FLAME PROPAGATION; OXIDATION; VELOCITY; COMBUSTION KINETICS; PRESSURE RANGE KILO PA; PRESSURE DEPENDENCE; Counterflow ignition; Spherical flames; Mechanism hierarchy

Citation Formats

Liu, W., Kelley, A.P., and Law, C.K.. Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene. United States: N. p., 2010. Web. doi:10.1016/J.COMBUSTFLAME.2009.11.002.
Liu, W., Kelley, A.P., & Law, C.K.. Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene. United States. doi:10.1016/J.COMBUSTFLAME.2009.11.002.
Liu, W., Kelley, A.P., and Law, C.K.. Sat . "Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene". United States. doi:10.1016/J.COMBUSTFLAME.2009.11.002.
@article{osti_21305719,
title = {Flame propagation and counterflow nonpremixed ignition of mixtures of methane and ethylene},
author = {Liu, W. and Kelley, A.P. and Law, C.K.},
abstractNote = {The ignition temperature of nitrogen-diluted mixtures of methane and ethylene counterflowing against heated air was measured up to five atmospheres. In addition, the stretch-corrected laminar flame speeds of mixtures of air, methane and ethylene were determined from outwardly-propagating spherical flames up to 10 atmospheres, for extensive range of the lean-to-rich equivalence ratio. These experimental data, relevant to low- to moderately-high-temperature ignition chemistry and high-temperature flame chemistry, respectively, were subsequently compared with calculations using two detailed kinetic mechanisms. A chemical explosive mode analysis (CEMA) was then conducted to identify the dominant ignition chemistry and the role of ethylene addition in facilitating nonpremixed ignition. Furthermore, the hierarchical structure of the associated oxidation kinetics was examined by comparing the sizes and constituents of the skeletal mechanisms of the pure fuels and their mixtures, derived using the method of directed relation graph (DRG). The skeletal mechanism was further reduced by time-scale analysis, leading to a 24-species reduced mechanism from the detailed mechanism of USC Mech II, validated within the parameter space of the conducted experiments. (author)},
doi = {10.1016/J.COMBUSTFLAME.2009.11.002},
journal = {Combustion and Flame},
number = 5,
volume = 157,
place = {United States},
year = {Sat May 15 00:00:00 EDT 2010},
month = {Sat May 15 00:00:00 EDT 2010}
}