Large eddy simulation of air entrainment and mixing in reacting and non-reacting diesel sprays

Research output: Contribution to journalArticlepeer-review

Authors

  • Cheng Gong
  • Mehdi Jangi
  • Tommaso Lucchini
  • Gianluca D'Errico
  • Xue Song Bai

Colleges, School and Institutes

External organisations

  • Lunds Universitet
  • Politecnico di Milano

Abstract

Large eddy simulation is performed to investigate air entrainment and mixing in diesel sprays with and without combustion. The Spray A case of the Engine Combustion Network (ECN) is considered in the study, in which liquid n-Dodecane is injected at 1500 bar through a nozzle of 90 μm into a constant volume vessel with an ambient density of 22.8 kg/m3 and an ambient temperature of 900 K. Primary and secondary breakup processes of the liquid fuel are taken into account. The gas and liquid phases are modeled using Eulerian/Lagrangian coupling approach. Detailed chemical kinetics for n-Dodecane is employed to simulate the ignition process and the lifted flames. A chemistry coordinate mapping approach is used for speeding up the calculations. The effect of low temperature ignition (cool flame) on the evaporation process and on the liquid penetration length is analyzed. The effect of combustion heat release from the lifted flames on the vapor spreading in the radial direction and on the vapor transport in the streamwise direction (vapor penetration) is investigated.

Details

Original languageEnglish
Pages (from-to)385-404
Number of pages20
JournalFlow, Turbulence and Combustion
Volume93
Issue number3
Early online date23 Aug 2014
Publication statusPublished - 1 Oct 2014

Keywords

  • Air entrainment, Diesel combustion, Diesel spray, Large eddy simulation