Title

Effects Of Fuel Lewis Number On Nitric Oxide Emission Of Diluted H2 Turbulent Jet Diffusion Flames

Abstract

Results are reported on the effect of fuel Lewis number (Le(F)) in turbulent jet diffusion flames of diluted H2 fuels. The results include the flame temperature, the emission index of nitric oxides (EINO(x)), and the Damkohler number (Da) scaling of EINO(x) (EINO(x)/[L(f)3/d(F)2U(F)] = Da(n), where L(f), d(F), and U(F) are flame length, jet diameter, and jet exit velocity, respectively), which has been previously established. The effect of Le(F) was found to exist, although diminished in turbulent flames. Depending on the level and the type of dilution, the diluent that resulted in a lower value of Le(F) also had a higher flame temperature and produced larger values of both EINO(x) and the normalized emission index EINO(x)/[L(f)3/d(F)2U(F)], which is also considered as the global NO formation rate of the flame. The exponent n = -1/2 was reproduced for the present He-diluted flames whose Le(F) ~ 1.0. For Ar- and CO2-diluted flames with Le(F) ≥ 1.0 (20% and 40% dilution), n = -1/2 was also preserved. For dilution with 60% Ar or CO2, whose Le(F) are 0.68 and 0.528, respectively, the exponent n was found to be positive. These results suggest the significant effects of Le(F) on NO(x) emission from turbulent diffusion flames. Copyright (C) 2000 The Combustion Institute.

Publication Date

3-1-2000

Publication Title

Combustion and Flame

Volume

121

Issue

3

Number of Pages

525-534

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S0010-2180(99)00159-5

Socpus ID

0034018772 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0034018772

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