Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 4 van 10 gevonden artikelen
 
 
  Effects of Pressure and Preheat on Super-Adiabatic Flame Temperatures in Rich Premixed Methane/Air Flames
 
 
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
 
<< vorige    volgende >>
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland