Asymptotic theory of diffusion-flame extinction in the stagnation-point boundary layer

✍ Scribed by L. Krishnamurthy; F.A. Williams; K. Seshadri

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 997 KB
• Volume: 26
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(76)90089-4

✦ Synopsis

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 Damk6hler 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.