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Effects of fuel cetane number on the structure of diesel spray combustion: An accelerated Eulerian stochastic fields method

Jangi, Mehdi LU ; Lucchini, Tommaso; Gong, Cheng LU and Bai, Xue-Song LU (2015) In Combustion Theory and Modelling 19(5). p.549-567
Abstract
An Eulerian stochastic fields (ESF) method accelerated with the chemistry coordinate mapping (CCM) approach for modelling spray combustion is formulated, and applied to model diesel combustion in a constant volume vessel. In ESF-CCM, the thermodynamic states of the discretised stochastic fields are mapped into a low-dimensional phase space. Integration of the chemical stiff ODEs is performed in the phase space and the results are mapped back to the physical domain. After validating the ESF-CCM, the method is used to investigate the effects of fuel cetane number on the structure of diesel spray combustion. It is shown that, depending of the fuel cetane number, liftoff length is varied, which can lead to a change in combustion mode from... (More)
An Eulerian stochastic fields (ESF) method accelerated with the chemistry coordinate mapping (CCM) approach for modelling spray combustion is formulated, and applied to model diesel combustion in a constant volume vessel. In ESF-CCM, the thermodynamic states of the discretised stochastic fields are mapped into a low-dimensional phase space. Integration of the chemical stiff ODEs is performed in the phase space and the results are mapped back to the physical domain. After validating the ESF-CCM, the method is used to investigate the effects of fuel cetane number on the structure of diesel spray combustion. It is shown that, depending of the fuel cetane number, liftoff length is varied, which can lead to a change in combustion mode from classical diesel spray combustion to fuel-lean premixed burned combustion. Spray combustion with a shorter liftoff length exhibits the characteristics of the classical conceptual diesel combustion model proposed by Dec in 1997 (http://dx.doi.org/10.4271/970873), whereas in a case with a lower cetane number the liftoff length is much larger and the spray combustion probably occurs in a fuel-lean-premixed mode of combustion. Nevertheless, the transport budget at the liftoff location shows that stabilisation at all cetane numbers is governed primarily by the auto-ignition process. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
transported PDF, acceleration technique, diesel spray flames
in
Combustion Theory and Modelling
volume
19
issue
5
pages
549 - 567
publisher
Taylor & Francis
external identifiers
  • wos:000363662300001
  • scopus:84942428962
ISSN
1364-7830
DOI
10.1080/13647830.2015.1057234
language
English
LU publication?
yes
id
0eb21f52-de51-43ae-8993-b311300791cc (old id 8404892)
date added to LUP
2015-12-21 08:10:53
date last changed
2017-09-10 03:14:14
@article{0eb21f52-de51-43ae-8993-b311300791cc,
  abstract     = {An Eulerian stochastic fields (ESF) method accelerated with the chemistry coordinate mapping (CCM) approach for modelling spray combustion is formulated, and applied to model diesel combustion in a constant volume vessel. In ESF-CCM, the thermodynamic states of the discretised stochastic fields are mapped into a low-dimensional phase space. Integration of the chemical stiff ODEs is performed in the phase space and the results are mapped back to the physical domain. After validating the ESF-CCM, the method is used to investigate the effects of fuel cetane number on the structure of diesel spray combustion. It is shown that, depending of the fuel cetane number, liftoff length is varied, which can lead to a change in combustion mode from classical diesel spray combustion to fuel-lean premixed burned combustion. Spray combustion with a shorter liftoff length exhibits the characteristics of the classical conceptual diesel combustion model proposed by Dec in 1997 (http://dx.doi.org/10.4271/970873), whereas in a case with a lower cetane number the liftoff length is much larger and the spray combustion probably occurs in a fuel-lean-premixed mode of combustion. Nevertheless, the transport budget at the liftoff location shows that stabilisation at all cetane numbers is governed primarily by the auto-ignition process.},
  author       = {Jangi, Mehdi and Lucchini, Tommaso and Gong, Cheng and Bai, Xue-Song},
  issn         = {1364-7830},
  keyword      = {transported PDF,acceleration technique,diesel spray flames},
  language     = {eng},
  number       = {5},
  pages        = {549--567},
  publisher    = {Taylor & Francis},
  series       = {Combustion Theory and Modelling},
  title        = {Effects of fuel cetane number on the structure of diesel spray combustion: An accelerated Eulerian stochastic fields method},
  url          = {http://dx.doi.org/10.1080/13647830.2015.1057234},
  volume       = {19},
  year         = {2015},
}