The effect of back diffusion of intermediate hydrogen on methane-air and propane-air flames diluted with nitrogen in a stagnation flow

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(91)90061-F· OSTI ID:5728094

Yamaoka, I ^[1]; Tsuji, H ^[2]

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1. Research Lab., Noritz Corp., Hachi-oji, Tokyo (JP)
2. Dept. of Mechanical Engineering, Tokyo Denki Univ., Tokyo (JP)

This paper reports on experimental studies on the behavior, structure, and extinction of laminar, premixed methane-air and propane-air flames diluted with nitrogen in a stagnation flow made using counterflow, twin flames established in the forward stagnation region of a porous cylinder. The extinction limits of the twin flames, the flame separation distance at extinction, and the concentrations of some stable species on the stagnation surface for flames very near the extinction limit are measured over the whole composition range of fuel-air-nitrogen flames. The experiments are made under the condition of a constant stagnation velocity gradient. The concentration distributions of stable species across the twin flames are also measured for flames near extinction. An anomalous relationship between the flame separation distance {Delta} at extinction and the equivalence ratio {phi} of the mixture is found for rich methane flames, but not for propane flames.

• OSTI ID: 5728094
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 86:1; ISSN CBFMA; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
092000 -- Biomass Fuels-- Combustion-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
AIR
ALKANES
ALLOYS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
DIFFUSION
DISPERSIONS
ELEMENTS
FLAMES
FLUID FLOW
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
KINETICS
LAMINAR FLOW
METHANE
MIXTURES
NITROGEN ADDITIONS
NONMETALS
ORGANIC COMPOUNDS
PROPANE
REACTION KINETICS
VELOCITY