Asymptotic structure of premixed methane-air flames with slow CO oxidation. (Reannouncement with new availability information)
The asymptotic structures of methane-air flames, for equivalence ratios from 0.5 to 1.4 and pressures from 1 to 70 atm, are analyzed on the basis of a reduced four-step chemical-kinetic mechanism that has previously predicted burning velocities with reasonable accuracy. The rates of these four steps are related to the rates of elementary reactions appearing in the C1-chain mechanism for oxidation of methane. Reduced chemical-kinetic mechanisms have been employed successfully in previous studies to describe the structure of lean and stoichiometric laminar, premixed methane-air flames. The essential common feature in these analyses is that the basic structure of the flame is presumed to consist of distinct layers, which include an inner layer with thickness of order delta, an oxidation layer with thickness of order epsilon and a preheat zone and a post-flame zone with thicknesses of order unity, with delta < epsilon < 1. All the hydrocarbon chemistry is presumed to occur in the inner layer, which represents the merged structure of the fuel-consumption and radical-consumption layers, where the fuel is attacked by radicals to form CO and H2.
- Research Organization:
- California Univ., San Diego, La Jolla, CA (United States). Dept. of Applied Mechanics and Engineering Sciences
- OSTI ID:
- 177480
- Report Number(s):
- AD-A--256266/8/XAB; CNN: Contract DAAL03-86-K-0001
- Country of Publication:
- United States
- Language:
- English
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