The role of a split injection strategy in the mixture formation and combustion of diesel spray: A large-eddy simulation

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Lunds Universitet
  • Technical University of Denmark

Abstract

The role of a split injection in the mixture formation and combustion characteristics of a diesel spray in an engine like condition is investigated. We use large-eddy simulations with finite rate chemistry in order to identify the main controlling mechanism that can potentially improve the mixture quality and reduces the combustion emissions. It is shown that the primary effect of the split injection is the reduction of the mass of the fuel-rich region where soot
precursors can form.
Furthermore, we investigate the interaction between different injections and explain the effects of the first injection on the mixing and combustion of the second injection. Results show that the penetration of the second injection is
faster than that of the first injection. More importantly, it is shown that the ignition delay time of the second injection is much shorter than that of the first injection. This is due to the residual effects of the ignition of the first injection
which increases the local temperature and maintains a certain level of combustion some intermediates or radical which in turn boosts the ignition of the second injection.

Details

Original languageEnglish
Pages (from-to)4709-4716
JournalProceedings of the Combustion Institute
Volume37
Issue number4
Early online date6 Nov 2018
Publication statusE-pub ahead of print - 6 Nov 2018
Event37th International Symposium on Combustion - The Convention Centre, Dublin, Ireland
Duration: 29 Jul 20183 Aug 2018

Keywords

  • Split injection, Jet-jet interaction, Mixture formation, Large-eddy simulation