Outward propagation, burning velocities and chemical effects of methane flames up to 60 atmospheres

G. Rozenchan, D. L. Zhu, C. K. Law, S. D. Tse

Research output: Contribution to conferencePaperpeer-review

Abstract

Using a specially designed high and constant pressure combustion chamber, the propagation and morphology of spark-ignited expanding spherical methane flames were imaged utilizing schlieren cinematography and a high-speed digital camera. Stretch-free laminar burning velocities were subsequently determined for CH4-air flames ≤ 20 atm and CH4-oxygen-helium flames ≤ 60 atm. Computational simulation using GRI-Mech 3.0 revealed satisfactory agreement with the experimental data ≤ 20 atm, and moderate deviation for pressures > 40 atm. Markstein lengths, global activation energies, and overall reaction orders were also determined as functions of pressure, with the latter two parameters displaying non-monotonic behavior caused by the changeover from H-O2 to HO2 chemistry comparable to that of the explosion limits of homogeneous hydrogen-oxygen mixtures. Original is an abstract.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2002
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: Jul 21 2002Jul 26 2002

Other

Other29th International Symposium on Combustion
CountryJapan
CitySapporo
Period7/21/027/26/02

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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