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Analysis of in-cylinder H2O2 and HO2 distributions in an HCCI engine - Comparison of laser-diagnostic results with CFD and SRM simulations

Coskun, Gökhan LU ; Jonsson, Malin LU ; Bood, Joakim LU ; Tunér, Martin LU ; Algotsson, Martin LU ; Li, Bo LU ; Li, Zhongshan LU ; Soyhan, Hakan Serhad; Aldén, Marcus LU and Johansson, Bengt LU (2015) In Combustion and Flame 162(9). p.3131-3139
Abstract
By applying a novel approach to evaluate photofragmentation laser-induced fluorescence (PFLIF) imaging, experimental quantitative information on the temporal in-cylinder distribution of hydrogen peroxide (H2O2) in a homogeneous charge compression ignition (HCCI) engine was extracted. The results from PFLIF were then compared to those obtained from chemical kinetics simulations using computational fluid dynamics (CFD) and a stochastic reactor model (SRM). For the CFD simulations, a sector mesh was applied using Reynolds-averaged Navier-Stokes (RANS) equations together with a reduced chemical kinetic model. These simulations provided detailed information on the spatial distribution of H2O2, HO2 as well as other important species and... (More)
By applying a novel approach to evaluate photofragmentation laser-induced fluorescence (PFLIF) imaging, experimental quantitative information on the temporal in-cylinder distribution of hydrogen peroxide (H2O2) in a homogeneous charge compression ignition (HCCI) engine was extracted. The results from PFLIF were then compared to those obtained from chemical kinetics simulations using computational fluid dynamics (CFD) and a stochastic reactor model (SRM). For the CFD simulations, a sector mesh was applied using Reynolds-averaged Navier-Stokes (RANS) equations together with a reduced chemical kinetic model. These simulations provided detailed information on the spatial distribution of H2O2, HO2 as well as other important species and temperature. The SRM, which offers substantially reduced simulation times but no spatial information, was used with the same reduced kinetic model. Two-dimensional images from PFLIF and CFD show a fair temporal agreement, while details of the spatial distributions disagree. The CFD images show that the combustion chemistry is affected by the interaction with the cylinder walls with, for instance, a local delay of the formation and consumption of H2O2. By using probability density functions (PDFs) of H2O2 and HO2 mass fractions, comparisons could be made between experimental data and both the CFD and SRM simulations. In general the range of mass fractions show good agreement but the experimental distributions are wider. Possible reasons for this discrepancy are actual heterogeneities in the H2O2/HO2 concentration distributions not predicted by the model, spatial temperature variations, which will influence the strength of the PFLIF signal, spatial variations in the laser profiles, not accounted for in the data processing, and photon noise. The good agreement between the CFD and SRM shows the relevance of fast PDF based simulation tools. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Photofragmentation laser-induced fluorescence, CFD simulations, SRM, simulations, Hydrogen peroxide, Hydroperoxyl radical, HCCI engine
in
Combustion and Flame
volume
162
issue
9
pages
9 pages
publisher
Elsevier
external identifiers
  • wos:000360779100001
  • scopus:84983094608
ISSN
0010-2180
DOI
10.1016/j.combustflame.2015.02.002
language
English
LU publication?
yes
id
25050b85-d1a8-457e-a6f6-452b25d093f3 (old id 8077550)
date added to LUP
2015-10-26 14:01:50
date last changed
2017-07-30 04:09:35
@article{25050b85-d1a8-457e-a6f6-452b25d093f3,
  abstract     = {By applying a novel approach to evaluate photofragmentation laser-induced fluorescence (PFLIF) imaging, experimental quantitative information on the temporal in-cylinder distribution of hydrogen peroxide (H2O2) in a homogeneous charge compression ignition (HCCI) engine was extracted. The results from PFLIF were then compared to those obtained from chemical kinetics simulations using computational fluid dynamics (CFD) and a stochastic reactor model (SRM). For the CFD simulations, a sector mesh was applied using Reynolds-averaged Navier-Stokes (RANS) equations together with a reduced chemical kinetic model. These simulations provided detailed information on the spatial distribution of H2O2, HO2 as well as other important species and temperature. The SRM, which offers substantially reduced simulation times but no spatial information, was used with the same reduced kinetic model. Two-dimensional images from PFLIF and CFD show a fair temporal agreement, while details of the spatial distributions disagree. The CFD images show that the combustion chemistry is affected by the interaction with the cylinder walls with, for instance, a local delay of the formation and consumption of H2O2. By using probability density functions (PDFs) of H2O2 and HO2 mass fractions, comparisons could be made between experimental data and both the CFD and SRM simulations. In general the range of mass fractions show good agreement but the experimental distributions are wider. Possible reasons for this discrepancy are actual heterogeneities in the H2O2/HO2 concentration distributions not predicted by the model, spatial temperature variations, which will influence the strength of the PFLIF signal, spatial variations in the laser profiles, not accounted for in the data processing, and photon noise. The good agreement between the CFD and SRM shows the relevance of fast PDF based simulation tools. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Coskun, Gökhan and Jonsson, Malin and Bood, Joakim and Tunér, Martin and Algotsson, Martin and Li, Bo and Li, Zhongshan and Soyhan, Hakan Serhad and Aldén, Marcus and Johansson, Bengt},
  issn         = {0010-2180},
  keyword      = {Photofragmentation laser-induced fluorescence,CFD simulations,SRM,simulations,Hydrogen peroxide,Hydroperoxyl radical,HCCI engine},
  language     = {eng},
  number       = {9},
  pages        = {3131--3139},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Analysis of in-cylinder H2O2 and HO2 distributions in an HCCI engine - Comparison of laser-diagnostic results with CFD and SRM simulations},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2015.02.002},
  volume       = {162},
  year         = {2015},
}