Combustion and ignition characteristics of ammonia/air mixtures in a micro flow reactor with a controlled temperature profile

Hisashi Nakamura, Susumu Hasegawa

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

Combustion and ignition characteristics of a stoichiometric NH3/air mixture were examined by a micro flow reactor with a controlled temperature profile from ambient temperature to 1300 K at atmospheric pressure. Three kinds of flame dynamics depending on inlet mean flow velocities namely normal flames in the high velocity regime flames with repetitive extinction and ignition in the intermediate velocity regime and weak flames in the low velocity regime were observed for NH3. The existence of NH3 weak flames at 1270 K was confirmed. Species measurement for a stoichiometric NH3/air weak flame at 10 cm/s was conducted using and a mass spectrometer and a T-shaped reactor fused with a micro-probe to elucidate the structure of the NH3/air weak flame confirming a complete combustion at 1290 K. Five reaction mechanisms were used for computations of weak flames of which four of them did not predict complete combustion within the given computational domain while one reaction mechanism predicted complete combustion but the weak flame position in computation was located in a temperature region lower than that in the experiment. The capability of weak flame methodology to validate ignition properties of reaction mechanisms for low reactivity fuels e.g. NH3 was demonstrated.

Original languageEnglish
Pages (from-to)4217-4226
Number of pages10
JournalProceedings of the Combustion Institute
Volume36
Issue number3
DOIs
Publication statusPublished - 2017

Keywords

  • Ammonia
  • Chemical kinetics
  • Energy carrier
  • Microcombustion
  • Nitrogen oxides (NOx)

ASJC Scopus subject areas

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

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