Turbulent partially premixed flames of nitrogen-diluted methane near extinction

Journal Article · Wed May 01 00:00:00 EDT 1991 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(91)90189-I· OSTI ID:5117597

Mansour, M S; Bilger, R W ^[1]; Dibble, R W ^[2]

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1. Dept. of Mechanical Engineering, The Univ. of Sydney, N.S.W. 2006 (AU)
2. Combustion Research Facility, Sandia National Lab., Livermore, CA (US)

Spontaneous Raman/Rayleigh measurements have been carried out in turbulent partially premixed flames of nitrogen-diluted methane near extinction. The flames are created in a reverse flow reactor (RFR) and are stabilized by means of a recirculation zone. The flames are stretched by reducing the residence time of the flow within the reactor. The mean profiles, scatter plots, and conditional pdfs are used to study the flame structure in the present investigation. The detailed structure studies have been carried out in two shear layers, where the stretch rates are highest. The data presented in this article are for two flames close to extinction at low residence times (3.6 and 5.1 ms). The flame structure at both shear layers shows quite significant chemical kinetic effects on approaching extinction. These effects reduce the products concentration and temperature and increase the reactants. Also, these effects increase the CO concentration. A substantial decrease in the reactedness of the reactive scalars has also been found at both shear layers on approaching extinction. The flame structure shows broad distribution between the equilibrium and frozen limits with no obvious bimodality. From the conditional pdfs, the reactedness decreases around stoichiometric and increases at the lean side of the stoichiometric.

• OSTI ID: 5117597
• Journal Information: Combustion and Flame; (United States), Vol. 85:1; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
09 BIOMASS FUELS
METHANE
FLAMES
NITROGEN
CHEMICAL REACTION KINETICS
MIXTURES
STOICHIOMETRY
TURBULENT FLOW
ALKANES
DISPERSIONS
ELEMENTS
FLUID FLOW
HYDROCARBONS
KINETICS
NONMETALS
ORGANIC COMPOUNDS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
092000 - Biomass Fuels- Combustion- (1990-)