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

Journal Article · Sat May 15 00:00:00 EDT 2010 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2009.11.002· OSTI ID:21305719

Liu, W; Kelley, A P; Law, C K ^[1]

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1. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)

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)

• OSTI ID: 21305719
• Journal Information: Combustion and Flame, Vol. 157, Issue 5; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

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