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Numerical simulation of a mixed-mode reaction front in a PPC engine

Ibron, Christian LU ; Fatehi, Hesammedin LU ; Wang, Zhenkan LU ; Stamatoglou, Panagiota LU ; Lundgren, Marcus LU ; Aldén, Marcus LU ; Richter, Mattias LU ; Andersson, Öivind LU and Bai, Xue Song LU (2021) 38th International Symposium on Combustion, 2021 38. p.5703-5711
Abstract

The ignition process, mode of combustion and reaction front propagation in a partially premixed combustion (PPC) engine running with a primary reference fuel (87 vol% iso-octane, 13 vol% n-heptane) were investigated numerically in a large eddy simulation (LES). A one-equation sub-grid scale model coupled to the partially stirred reactor model and a finite rate chemical model were used in LES. Different combustion modes, ignition front propagation, premixed flame and non-premixed flame, were observed simultaneously. Displacement speed of CO iso-surface propagation described the transition of premixed auto-ignition to non-premixed flame. High temporal resolution optical data of CH2O and chemiluminescence were compared with... (More)

The ignition process, mode of combustion and reaction front propagation in a partially premixed combustion (PPC) engine running with a primary reference fuel (87 vol% iso-octane, 13 vol% n-heptane) were investigated numerically in a large eddy simulation (LES). A one-equation sub-grid scale model coupled to the partially stirred reactor model and a finite rate chemical model were used in LES. Different combustion modes, ignition front propagation, premixed flame and non-premixed flame, were observed simultaneously. Displacement speed of CO iso-surface propagation described the transition of premixed auto-ignition to non-premixed flame. High temporal resolution optical data of CH2O and chemiluminescence were compared with simulated results. A high-speed ignition front was found to expand through fuel-rich mixture and stabilize around stoichiometry in a non-premixed flame while lean premixed combustion occurs in the spray wake at a much slower pace. A good qualitative agreement of the distribution of chemiluminescence and CH2O formation and destruction indicated that the simulation approach sufficiently captures the driving physics of mixed-mode combustion in PPC engines. The transition from auto-ignition to flame occurs over a period of several crank angles and the reaction front propagation can be captured using the described model.

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Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Ignition, Low temperature combustion, Mixed-mode combustion, Partially premixed combustion, Reaction front
host publication
Proceedings of the Combustion Institute
volume
38
edition
4
pages
9 pages
publisher
Elsevier
conference name
38th International Symposium on Combustion, 2021
conference location
Adelaide, Australia
conference dates
2021-01-24 - 2021-01-29
external identifiers
  • scopus:85097595295
DOI
10.1016/j.proci.2020.09.012
language
English
LU publication?
yes
id
7b496f68-7867-44ca-afa1-0ca7a2192f43
date added to LUP
2021-12-22 13:57:58
date last changed
2022-04-27 06:49:46
@inproceedings{7b496f68-7867-44ca-afa1-0ca7a2192f43,
  abstract     = {{<p>The ignition process, mode of combustion and reaction front propagation in a partially premixed combustion (PPC) engine running with a primary reference fuel (87 vol% iso-octane, 13 vol% n-heptane) were investigated numerically in a large eddy simulation (LES). A one-equation sub-grid scale model coupled to the partially stirred reactor model and a finite rate chemical model were used in LES. Different combustion modes, ignition front propagation, premixed flame and non-premixed flame, were observed simultaneously. Displacement speed of CO iso-surface propagation described the transition of premixed auto-ignition to non-premixed flame. High temporal resolution optical data of CH<sub>2</sub>O and chemiluminescence were compared with simulated results. A high-speed ignition front was found to expand through fuel-rich mixture and stabilize around stoichiometry in a non-premixed flame while lean premixed combustion occurs in the spray wake at a much slower pace. A good qualitative agreement of the distribution of chemiluminescence and CH<sub>2</sub>O formation and destruction indicated that the simulation approach sufficiently captures the driving physics of mixed-mode combustion in PPC engines. The transition from auto-ignition to flame occurs over a period of several crank angles and the reaction front propagation can be captured using the described model.</p>}},
  author       = {{Ibron, Christian and Fatehi, Hesammedin and Wang, Zhenkan and Stamatoglou, Panagiota and Lundgren, Marcus and Aldén, Marcus and Richter, Mattias and Andersson, Öivind and Bai, Xue Song}},
  booktitle    = {{Proceedings of the Combustion Institute}},
  keywords     = {{Ignition; Low temperature combustion; Mixed-mode combustion; Partially premixed combustion; Reaction front}},
  language     = {{eng}},
  pages        = {{5703--5711}},
  publisher    = {{Elsevier}},
  title        = {{Numerical simulation of a mixed-mode reaction front in a PPC engine}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2020.09.012}},
  doi          = {{10.1016/j.proci.2020.09.012}},
  volume       = {{38}},
  year         = {{2021}},
}