Large Eddy Simulation of Air Entrainment and Mixing in Reacting and Non-Reacting Diesel Sprays
Author
Summary, in English
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 mu m into a constant volume vessel with an ambient density of 22.8 kg/m(3) 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.
Publishing year
2014
Language
English
Pages
385-404
Publication/Series
Flow, Turbulence and Combustion
Volume
93
Issue
3
Document type
Journal article
Publisher
Springer
Topic
- Fluid Mechanics and Acoustics
Keywords
- Diesel spray
- Air entrainment
- Diesel combustion
- Large eddy simulation
Status
Published
ISBN/ISSN/Other
- ISSN: 1573-1987