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Dual Fuel Combustion of N-heptane/methanol-air-EGR Mixtures

Hu, Siyuan LU ; Gong, Cheng LU and Bai, Xue-Song LU (2017) In Energy Procedia 105. p.4943-4948
Abstract
Numerical simulations are performed to study the combustion processes of n-heptane and methanol/air/EGR under high-temperature and high-pressure conditions relevant to a dual-fuel compression-ignition engine. Detailed chemical kinetic mechanism and transport properties are considered in the simulation. The simulations are carried out by performing three-dimensional (3D) direct numerical simulation (DNS) in a cuboid constant volume enclosure and two-dimensional (2D) DNS in a constant volume domain corresponding to the 3D domain. The results reveal three combustion modes involved in dual fuel engines, the ignition of the n-heptane jet, the propagation of thin reaction fronts in the methanol/air/EGR mixture, and finally the onset of ignition... (More)
Numerical simulations are performed to study the combustion processes of n-heptane and methanol/air/EGR under high-temperature and high-pressure conditions relevant to a dual-fuel compression-ignition engine. Detailed chemical kinetic mechanism and transport properties are considered in the simulation. The simulations are carried out by performing three-dimensional (3D) direct numerical simulation (DNS) in a cuboid constant volume enclosure and two-dimensional (2D) DNS in a constant volume domain corresponding to the 3D domain. The results reveal three combustion modes involved in dual fuel engines, the ignition of the n-heptane jet, the propagation of thin reaction fronts in the methanol/air/EGR mixture, and finally the onset of ignition of the entire mixture. In dual-fuel combustion under high initial temperature conditions (1000K or higher) the three different combustion modes occur rather quickly with two distinct peaks of heat release corresponding to the two ignition modes. At low temperatures (800K or lower) the ignition delay time of the mixture is longer and more complete mixing is achieved before the onset of a single ignition of the n-heptane/methanol mixture. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Energy Procedia
volume
105
pages
4943 - 4948
publisher
Elsevier
external identifiers
  • scopus:85020752829
ISSN
1876-6102
DOI
10.1016/j.egypro.2017.03.986
language
English
LU publication?
yes
id
48098c40-eeb5-4fb2-9790-bf07c830cd84
date added to LUP
2017-07-04 15:11:27
date last changed
2017-07-09 05:03:11
@article{48098c40-eeb5-4fb2-9790-bf07c830cd84,
  abstract     = {Numerical simulations are performed to study the combustion processes of n-heptane and methanol/air/EGR under high-temperature and high-pressure conditions relevant to a dual-fuel compression-ignition engine. Detailed chemical kinetic mechanism and transport properties are considered in the simulation. The simulations are carried out by performing three-dimensional (3D) direct numerical simulation (DNS) in a cuboid constant volume enclosure and two-dimensional (2D) DNS in a constant volume domain corresponding to the 3D domain. The results reveal three combustion modes involved in dual fuel engines, the ignition of the n-heptane jet, the propagation of thin reaction fronts in the methanol/air/EGR mixture, and finally the onset of ignition of the entire mixture. In dual-fuel combustion under high initial temperature conditions (1000K or higher) the three different combustion modes occur rather quickly with two distinct peaks of heat release corresponding to the two ignition modes. At low temperatures (800K or lower) the ignition delay time of the mixture is longer and more complete mixing is achieved before the onset of a single ignition of the n-heptane/methanol mixture.},
  author       = {Hu, Siyuan and Gong, Cheng and Bai, Xue-Song},
  issn         = {1876-6102},
  language     = {eng},
  pages        = {4943--4948},
  publisher    = {Elsevier},
  series       = {Energy Procedia},
  title        = {Dual Fuel Combustion of N-heptane/methanol-air-EGR Mixtures},
  url          = {http://dx.doi.org/10.1016/j.egypro.2017.03.986},
  volume       = {105},
  year         = {2017},
}