357
Views
23
CrossRef citations to date
0
Altmetric
Original Articles

Effects of Pressure and Preheat on Super-Adiabatic Flame Temperatures in Rich Premixed Methane/Air Flames

&
Pages 437-452 | Published online: 23 Jan 2008
 

Abstract

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.

Log in via your institution

Log in to Taylor & Francis Online

PDF download + Online access

  • 48 hours access to article PDF & online version
  • Article PDF can be downloaded
  • Article PDF can be printed
USD 61.00 Add to cart

Issue Purchase

  • 30 days online access to complete issue
  • Article PDFs can be downloaded
  • Article PDFs can be printed
USD 1,493.00 Add to cart

* Local tax will be added as applicable

Related Research

People also read lists articles that other readers of this article have read.

Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.

Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.