Effects of platinum stagnation surface on the lean extinction limits of premixed methane/air flames at moderate surface temperatures

J. T. Wiswall*, J. Li, M. S. Wooldridge, Hong Im

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A stagnation flow reactor was used to study the effects of platinum on the lean flammability limits of atmospheric pressure premixed methane/air flames at moderate stagnation surface temperatures. Experimental and computational methods were used to quantify the equivalence ratio at the lean extinction limit (φext) and the corresponding stagnation surface temperature (Ts). A range of flow rates (57-90cm/s) and corresponding strain rates were considered. The results indicate that the gas-phase methane/air flames are sufficiently strong relative to the heterogeneous chemistry for Ts conditions less than 750K that the platinum does not affect φext. The computational results are in good agreement with the experimentally observed trends and further indicate that higher reactant flow rates (>139cm/s) and levels of dilution (>~10% N2) are required to weaken the gas-phase flame sufficiently for surface reaction to play a positive role on extending the lean flammability limits.

Original languageEnglish (US)
Pages (from-to)139-145
Number of pages7
JournalCombustion and Flame
Volume158
Issue number1
DOIs
StatePublished - Jan 1 2011

Keywords

  • Catalytic combustion
  • Flame extinction
  • Methane
  • Platinum
  • Stagnation flow

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Effects of platinum stagnation surface on the lean extinction limits of premixed methane/air flames at moderate surface temperatures'. Together they form a unique fingerprint.

Cite this