Ultra-lean combustion characteristics of premixed methane flames in a micro flow reactor with a controlled temperature profile

Tomoya Okuno, Hisashi Nakamura, Takuya Tezuka, Susumu Hasegawa, Kaoru Maruta

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Experiments and computations for CH4/O2/Xe and CH4/O2/N2 mixtures at ultra-lean conditions were conducted in a novel vertical micro flow reactor with a controlled temperature profile. The performance of several chemical mechanisms was evaluated at 0.3 0.5 and 0.7 equivalence ratios and at different dilution ratios by observing the weak flames. CH4/O2/Xe mixtures displayed a higher reactivity than CH4/O2/N2 flames both experimentally and computationally. Also lower dilution and lower equivalence ratios led to increased reactivity. Comparison between CH4/O2/Xe and CH4/O2/N2 flame structures showed observable differences between 1000 K and 1100 K. Reaction path and rate of production analysis showed that OH radicals are largely produced by (R1) H + O2 ⇔ OH + H and were inhibited by the third-body related reactions represented by (R10) H + O2 + M ⇔ HO2 + M. Since the third-body collision efficiency was larger for N2 than Xe the reactivity became lower for N2 mixtures than for Xe due to the larger effect of third-body reactions which explained the difference in reactivity for Xe diluted and N2 diluted flames.

Original languageEnglish
Pages (from-to)4227-4233
Number of pages7
JournalProceedings of the Combustion Institute
Volume36
Issue number3
DOIs
Publication statusPublished - 2017

Keywords

  • Chemistry validation
  • Flammability limit
  • Lean combustion
  • Micro flow reactor
  • Xenon diluted flame

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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