Simultaneous effects of fuel/oxidizer concentrations on the extinction of counterflow diffusion flames

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

DOI:https://doi.org/10.1016/0010-2180(91)90131-T· OSTI ID:5755393

Chen, C L; Sohrab, S H ^[1]

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1. Dept. of Mechanical Engineering, Northwestern Univ., Evanston, IL (US)

In this paper the combined influence of the fuel and the oxidizer concentrations and Lewis numbers on the extinction of finite-jet counterflow diffusion flames is experimentally and theoretically investigated. In the experiments, either methane or butane mixed in nitrogen is the fuel jet, while mixtures of oxygen and nitrogen are used as the oxidizer jet. The critical minimum values of the fuel (oxidizer) concentrations at extinction are determined at different values of the oxidizer (fuel) concentration in the opposing jet and various fixed values of the jet velocity. Thus, the domain of 'flammability' of the diffusion flames within the complete range of the fuel/oxidizer molar concentration (X{sub F}, X{sub O}) is obtained at various fixed values of the mean nozzle velocities. The concept of the 'external' or global versus the internal or local equivalence ratio is introduced to describe the simultaneous impact of the fuel and the oxidizer concentrations on the burning characteristics of diffusion flames.

• OSTI ID: 5755393
• Journal Information: Combustion and Flame; (United States), Vol. 86:4; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
09 BIOMASS FUELS
BUTANE
COMBUSTION KINETICS
FLAMES
METHANE
NITROGEN
MIXTURES
OXYGEN
CALCULATION METHODS
COUNTERFLOW SYSTEMS
DIFFUSION
EXPERIMENTAL DATA
HYDRODYNAMICS
INCOMPRESSIBLE FLOW
JETS
NOZZLES
OXIDIZERS
ALKANES
CHEMICAL REACTION KINETICS
DATA
DISPERSIONS
ELEMENTS
FLUID FLOW
FLUID MECHANICS
HYDROCARBONS
INFORMATION
KINETICS
MECHANICS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
092000 - Biomass Fuels- Combustion- (1990-)