Z. Wang, P.B. Sunderland, R.L. Axelbaum. Dilution Effects on Laminar Jet Diffusion Flame Lengths. Proceedings of the Combustion Institute. 2019 37 1547-1553.

Release time:2020-07-24

Impact Factor:5.63

DOI number:10.1016/j.proci.2018.06.085

Journal:Proceedings of the Combustion Institute

Key Words:Flame shape; Inverse flames; Oxygen enrichment; Roper model

Abstract:Many studies have examined the stoichiometric lengths of laminar gas jet diffusion flames. However, these have emphasized normal flames of undiluted fuel burning in air. Many questions remain about the effects of fuel dilution, oxygen-enhanced combustion, and inverse flames. Thus, the stoichiometric lengths of 287 normal and inverse gas jet flames are measured for a broad range of nitrogen dilution. The fuels are methane and propane and the ambient pressure is atmospheric. Nitrogen addition to the fuel and/or oxidizer is found to increase the stoichiometric lengths of both normal and inverse diffusion flames, but this effect is small at high reactant mole fraction. This counters previous assertions that inert addition to the fuel stream has a negligible effect on the lengths of normal diffusion flames. The analytical model of Roper is extended to these conditions by specifying the characteristic diffusivity to be the mean diffusivity of the fuel and oxidizer into stoichiometric products and a characteristic temperature that scales with the adiabatic flame temperature and the ambient temperature. The extended model correlates the measured lengths of normal and inverse flames with coefficients of determination of 0.87 for methane and 0.97 for propane. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Indexed by:Journal paper

Volume:37

Issue:5

Page Number:1547-1553

ISSN No.:1540-7489

Translation or Not:no

Date of Publication:2019-01-01

Included Journals:SCI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S1540748918302682?via%3Dihub