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Effect of Turbulence and Initial Temperature Inhomogeneity on Homogeneous Charge Compression Ignition Combustion

Yu, Rixin LU ; Bai, Xue-Song LU ; Lehtiniemi, Harry LU ; Ahmed, Syed LU ; Mauss, Fabian LU ; Richter, Mattias LU ; Aldén, Marcus LU ; Hildingsson, Leif LU ; Johansson, Bengt LU and Hultqvist, Anders LU (2006) In SAE technical paper series
Abstract
A 0.5-liter optical HCCI engine firing a mixture of n-heptane (50%) and iso-octane (50%) with air/fuel ratio of 3 is studied using large eddy simulation (LES) and laser diagnostics. Formaldehyde and OH LIF and in-cylinder pressure were measured in the experiments to characterize the ignition process. The LES made use of a detailed chemical kinetic mechanism that consists of 233 species and 2019 reactions. The auto-ignition simulation is coupled with LES by the use of a renormalized reaction progress variable. Systematic LES study on the effect of initial temperature inhomogeneity and turbulence intensity has been carried out to delineate their effect on the ignition process. It was shown that the charge under the present experimental... (More)
A 0.5-liter optical HCCI engine firing a mixture of n-heptane (50%) and iso-octane (50%) with air/fuel ratio of 3 is studied using large eddy simulation (LES) and laser diagnostics. Formaldehyde and OH LIF and in-cylinder pressure were measured in the experiments to characterize the ignition process. The LES made use of a detailed chemical kinetic mechanism that consists of 233 species and 2019 reactions. The auto-ignition simulation is coupled with LES by the use of a renormalized reaction progress variable. Systematic LES study on the effect of initial temperature inhomogeneity and turbulence intensity has been carried out to delineate their effect on the ignition process. It was shown that the charge under the present experimental condition would not be ignited without initial temperature inhomogeneity. Increasing temperature inhomogeneity leads to earlier ignition whereas increasing turbulence intensity would retard the ignition. This is mostly due to the effect of turbulence on the bulk flow that turbulence tends to decrease the temperature inhomogeneity by enhanced eddy heat transfer. The LES results suggest that desirable ignition timing could be achieved by controlling the turbulence intensity and temperature inhomogeneity. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Combustion engines diagonstics HCCI
in
SAE technical paper series
issue
2006-01-3318
publisher
Society of Automotive Engineers
external identifiers
  • scopus:85072436912
ISSN
0148-7191
DOI
10.4271/2006-01-3318
language
English
LU publication?
yes
id
a6d2c5c6-e90b-4a28-8cb1-50b83c27dd33 (old id 1396277)
date added to LUP
2009-05-13 12:38:04
date last changed
2019-10-06 03:53:11
@article{a6d2c5c6-e90b-4a28-8cb1-50b83c27dd33,
  abstract     = {A 0.5-liter optical HCCI engine firing a mixture of n-heptane (50%) and iso-octane (50%) with air/fuel ratio of 3 is studied using large eddy simulation (LES) and laser diagnostics. Formaldehyde and OH LIF and in-cylinder pressure were measured in the experiments to characterize the ignition process. The LES made use of a detailed chemical kinetic mechanism that consists of 233 species and 2019 reactions. The auto-ignition simulation is coupled with LES by the use of a renormalized reaction progress variable. Systematic LES study on the effect of initial temperature inhomogeneity and turbulence intensity has been carried out to delineate their effect on the ignition process. It was shown that the charge under the present experimental condition would not be ignited without initial temperature inhomogeneity. Increasing temperature inhomogeneity leads to earlier ignition whereas increasing turbulence intensity would retard the ignition. This is mostly due to the effect of turbulence on the bulk flow that turbulence tends to decrease the temperature inhomogeneity by enhanced eddy heat transfer. The LES results suggest that desirable ignition timing could be achieved by controlling the turbulence intensity and temperature inhomogeneity.},
  author       = {Yu, Rixin and Bai, Xue-Song and Lehtiniemi, Harry and Ahmed, Syed and Mauss, Fabian and Richter, Mattias and Aldén, Marcus and Hildingsson, Leif and Johansson, Bengt and Hultqvist, Anders},
  issn         = {0148-7191},
  keyword      = {Combustion engines diagonstics HCCI},
  language     = {eng},
  number       = {2006-01-3318},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE technical paper series},
  title        = {Effect of Turbulence and Initial Temperature Inhomogeneity on Homogeneous Charge Compression Ignition Combustion},
  url          = {http://dx.doi.org/10.4271/2006-01-3318},
  year         = {2006},
}