Asymptotic theory of diffusion-flame extinction in the stagnation-point boundary layer. [Laminar combustion of initially unmixed gases]

Journal Article · Tue Jun 01 00:00:00 EDT 1976 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(76)90089-4· OSTI ID:7349376

Krishnamurthy, L; Williams, F A; Seshadri, K

An analysis is developed for predicting extinction of the diffusion flame that is established when an oxidizing gas flows about the nose of a vaporizing fuel body. Use is made of the limit of a large ratio of the activation energy to the thermal energy at the flame for the overall combustion process, since this limit encompasses all cases of practical interest. By revealing a correspondence with the asymptotic flame structure of a counterflow diffusion flame analyzed earlier, the theory makes available explicit formulas, in term of a Damkoehler number, for study of gas-phase extinction in the present geometry. From these results a simplified but reasonably accurate method is developed for obtaining, from experimental data on extinction, kinetic information concerning the overall oxidation process occurring in the vicinity of extinction. Curves calculated from a parametric study are presented to facilitate application of the technique, and the procedure is illustrated for methanol burning in oxygen-nitrogen mixtures.

• Research Organization: Univ. of California, San Diego
• OSTI ID: 7349376
• Journal Information: Combust. Flame; (United States), Vol. 26:3
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
FLAMES
PREDICTION EQUATIONS
METHANOL
COMBUSTION KINETICS
ACTIVATION ENERGY
ASYMPTOTIC SOLUTIONS
BOUNDARY LAYERS
COMBUSTION
NITROGEN
OXIDATION
OXYGEN
QUENCHING
STAGNATION
ALCOHOLS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
EQUATIONS
FLUIDS
HEAT TREATMENTS
HYDROXY COMPOUNDS
KINETICS
LAYERS
NONMETALS
ORGANIC COMPOUNDS
REACTION KINETICS
090210* - Alcohol Fuels- Properties- (1976-1989)