Interaction of turbulent premixed flames with combustion products: Role of stoichiometry

Coriton, Bruno Rene Leon; Frank, Jonathan H.; Gomez, Alessandro

doi:10.1016/j.combustflame.2016.04.020

Title: Interaction of turbulent premixed flames with combustion products: Role of stoichiometry

Journal Article · Mon May 30 00:00:00 EDT 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.04.020· OSTI ID:1335516

^[1]; Frank, Jonathan H. ^[1]; Gomez, Alessandro ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Yale Univ., New Haven, CT (United States)

Stabilization methods of turbulent flames often involve mixing of reactants with hot products of combustion. The stabilizing effect of combustion product enthalpy has been long recognized, but the role played by the chemical composition of the product gases is typically overlooked. We employ a counterflow system to pinpoint the effects of the combustion product stoichiometry on the structure of turbulent premixed flames under conditions of both stable burning and local extinction. To that end, a turbulent jet of lean-to-rich, CH₄/O₂/N₂-premixed reactants at a turbulent Reynolds number of 1050 was opposed to a stream of hot products of combustion that were generated in a preburner. While the combustion product stream temperature was kept constant, its stoichiometry was varied independently from that of the reactant stream, leading to reactant-to-product stratification of relevance to practical combustion systems. The detailed structure of the turbulent flame front was analyzed in two series of experiments using laser-induced fluorescence (LIF): joint CH₂O LIF and OH LIF measurements and joint CO LIF and OH LIF measurements. Results revealed that a decrease in local CH₂O+OH and CO+OH reaction rates coincide with the depletion of OH radicals in the vicinity of the combustion product stream. These critical combustion reaction rates were more readily quenched in the presence of products of combustion from a stoichiometric flame, whereas they were favored by lean combustion products. As a result, stoichiometric combustion products contributed to a greater occurrence of local extinction. Furthermore, they limited the capacity of premixed reactants to ignite and of the turbulent premixed flames to stabilize. In contrast, lean and rich combustion products facilitated flame ignition and stability and reduced the rate of local extinction. The influence of the combustion product stream on the turbulent flame front was limited to a zone of approximately two millimeters from the gas mixing layer interface (GMLI) of the product stream. As a result, flame fronts that were separated from the GMLI by larger distances were unaffected by the product stream stoichiometry.

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Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC04-94AL85000; AC04-94-AL85000

OSTI ID:: 1335516

Alternate ID(s):: OSTI ID: 1425685

Report Number(s):: SAND-2016-12326J; 649699

Journal Information:: Combustion and Flame, Vol. 170, Issue C; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
turbulent counterflow
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