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| Titel: |
Asymptotic Analysis of the Structure and Extinction of Spherically Symmetrical n-Heptane Diffusion Flames |
| Auteur: |
Card, J. M. Williams, F. A. |
| Verschenen in: |
Combustion science and technology |
| Paginering: | Jaargang 84 (1992) nr. 1-6 pagina's 91-119 |
| Jaar: |
1992-07-01 |
| Inhoud: |
A minimal chemical-kinetic mechanism for the oxidation of n-heptane is reduced to a global two-step mechanism by the systematic application of partial-equilibrium and steady-state assumptions, with the global reaction rates related to the elementary rates. From this mechanism, the structure of spherically symmetrical diffusion flames around n-heptane droplets is analyzed using rate-ratio asymptotics. The outer transport zones are described by the classical flame-sheet analysis with Lewis numbers of unity. The inner structure consists of a thin fuel-consumption zone on the rich side of the flame and a broader but still thin layer on the lean side where H 2 and CO are oxidized. The theory identifies a scalar dissipation rate, related to the droplet diameter, appropriate for droplet burning. From the analysis, the variations in flame temperature and in species concentrations with the stoichiometric scalar dissipation rate X 11 were obtained. Since extinction occurs where x 51 reaches a maximum, the extinction diameters for n-heptane droplets can be estimated from the results and are given for different pressures and ambient oxygen concentrations. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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