A computational study of the effects of initial conditions on DME autoignition characteristics

Ocktaeck Lim, Narankhuu Jamsran, Norimasa Iida

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

This study was computationally investigated how DME autoignition reactivity is affected by EGR and intakepressure boost over various engine speed. CHEMKIN-PRO was used as a solver. Autoignition reactivity was mainly studied using contribution matrix. Investigations concentrate on their effects on variations of autoignition characteristics in-detail including reaction rates of dominant reactions. EGR addition results the increase of the burn duration by lowering reaction rates. Combustion timings were very sensitive to boost pressure which enhances the reactivity of intermediate species but burn durations dominantly rely on the EGR addition. Also, high engine speed under EGR addition increases the burn duration greatly. Finally, substantial reduction of peak PRR by controlling LTHR can be obtained through the combination of EGR and boost pressure over engine speeds at high load operation.

Original languageEnglish
Pages (from-to)1577-1580
Number of pages4
JournalEnergy Procedia
Volume61
DOIs
Publication statusPublished - 2014 Jan 1
Event6th International Conference on Applied Energy, ICAE 2014 - Taipei, Taiwan, Province of China
Duration: 2014 May 302014 Jun 2

Keywords

  • Autoignition
  • Boost
  • Di-methyl ether
  • Engine speed
  • Exhaust gas recirculation
  • Homogeneous charge compression ignition

ASJC Scopus subject areas

  • Energy(all)

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