Modeling of NO formation in premixed, high-pressure methane flames

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(99)00062-0· OSTI ID:20000583

Thomsen, D D; Kuligowski, F F; Laurendeau, N M

The Sandia steady, laminar, one-dimensional, premixed flame code is used to investigate NO formation in a series of lean-premixed CH{sub 4}/O{sub 2}/N{sub 2} laminar flames at pressures of 1--14.6 atm. Two different chemical kinetic measurements are evaluated in this study. The first mechanism, originally proposed by Glarborg et al. and then modified by Drake and Blint (GMK-DB), is an older mechanism that has preciously been shown to be superior to other early mechanisms when making quantitative predictions of NO concentration in lean, high-pressure laminar flames. The second mechanism is the newer GRI mechanism version 2.11. The modeling results for both mechanisms are compared to laser-induced fluorescence (LIF) measurements of NO concentration in the postflame region of a series of flat, laminar, lean (0.5 {le} {phi} {le} 0.8), premixed flames (N{sub 2}/O{sub 2} dilution ration of 2.2) stabilized on a water-cooled McKenna burner. The GRI mechanism, despite uniformly underpredicting NO formation in these flames, is shown to produce better qualitative agreement under these conditions that the GMK-DB mechanism. The study is then extended to a wider range of equivalence ratios (o.6 {le} {phi} {le} 1.6) at an N{sub 2}/O{sub 2} dilution ratio of 3.1. The results demonstrate that the GRI mechanism is not yet suitable for the quantitative prediction of NO concentrations in rich, premixed flames.

• Research Organization: Purdue Univ., West Lafayette, IN (US)
• Sponsoring Organization: US Department of Energy; National Aeronautics and Space Administration
• OSTI ID: 20000583
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 119; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
CHEMICAL REACTION YIELD
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
FLAMES
MATHEMATICAL MODELS
METHANE
NITRIC OXIDE