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| Titel: |
Effects of Pressure and Preheat on Super-Adiabatic Flame Temperatures in Rich Premixed Methane/Air Flames |
| Auteur: |
Liu, Fengshan Gulder, Omer L. |
| Verschenen in: |
Combustion science and technology |
| Paginering: | Jaargang 180 (2008) nr. 3 pagina's 437-452 |
| Jaar: |
2008-03 |
| Inhoud: |
The structure of freely propagating rich CH4/air flames was studied numerically using detailed thermal and transport properties and the GRI-Mech 3.0 mechanism. Different fresh mixture temperatures and ambient pressures were considered in the simulation to investigate the effects of preheat and pressure on the super-adiabatic flame temperature (SAFT) phenomenon. The occurrence of SAFT in rich CH4/air flames is chemical kinetics in nature and is associated with the overproduction of CH2CO and H2O in the reaction zone followed by their endothermic dissociations in the post-flame region. Preheat lowers the degree of H2O concentration overshoot and results in faster depletion of CH2CO concentration in the post-flame region. Preheat accelerates a rich CH4/air flame to approach equilibrium and suppresses the occurrence of SAFT. Increased pressure reduces the H radical concentration in the reaction zone and increases the overshoot of H2O concentration and the peak concentration of CH2CO. Although pressure also accelerates the approach of a rich CH4/air flame to equilibrium, it actually enhances the degree of SAFT. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 10 gevonden artikelen
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