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Modeling Diesel Engine Combustion with Detailed Chemistry Using a Progress Variable Approach

Lehtiniemi, Harry LU ; Mauss, Fabian LU ; Balthasar, Michael and Magnusson, Ingemar (2005) In SAE technical paper series
Abstract
In this work, we present an unsteady flamelet progress variable approach for diesel engine CFD combustion modelling. The progress variable is based on sensible enthalpy integrated over the flamelet and describes the transient flamelet ignition process. By using an unsteady flamelet library for the progress variable, the impact of local effects, for example variations in the turbulence field, effects of wall heat transfer, etc., on the autoignition chemistry can be considered on a cell level. The coupling between the unsteady flamelet library and the transport equation for total enthalpy follows the ideas of the representative interactive flamelet approach. Since the progress variable gives a direct description of the state in the flamelet,... (More)
In this work, we present an unsteady flamelet progress variable approach for diesel engine CFD combustion modelling. The progress variable is based on sensible enthalpy integrated over the flamelet and describes the transient flamelet ignition process. By using an unsteady flamelet library for the progress variable, the impact of local effects, for example variations in the turbulence field, effects of wall heat transfer, etc., on the autoignition chemistry can be considered on a cell level. The coupling between the unsteady flamelet library and the transport equation for total enthalpy follows the ideas of the representative interactive flamelet approach. Since the progress variable gives a direct description of the state in the flamelet, the method can be compared to having a flamelet in each computational cell in the CFD grid.



The progress variable approach is applied to high-EGR, late injection operating conditions, and we demonstrate that the model can be applied for 3D engine simulations. (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 modelling Diagnostic Diesel enginen
in
SAE technical paper series
publisher
Society of Automotive Engineers
external identifiers
  • Scopus:84877187789
language
English
LU publication?
yes
id
b9213149-7116-4759-a87e-50b78cc15928 (old id 742346)
alternative location
http://www.sae.org/technical/papers/2005-01-3855
date added to LUP
2007-12-13 12:01:08
date last changed
2016-11-15 13:24:27
@misc{b9213149-7116-4759-a87e-50b78cc15928,
  abstract     = {In this work, we present an unsteady flamelet progress variable approach for diesel engine CFD combustion modelling. The progress variable is based on sensible enthalpy integrated over the flamelet and describes the transient flamelet ignition process. By using an unsteady flamelet library for the progress variable, the impact of local effects, for example variations in the turbulence field, effects of wall heat transfer, etc., on the autoignition chemistry can be considered on a cell level. The coupling between the unsteady flamelet library and the transport equation for total enthalpy follows the ideas of the representative interactive flamelet approach. Since the progress variable gives a direct description of the state in the flamelet, the method can be compared to having a flamelet in each computational cell in the CFD grid. <br/><br>
<br/><br>
The progress variable approach is applied to high-EGR, late injection operating conditions, and we demonstrate that the model can be applied for 3D engine simulations.},
  author       = {Lehtiniemi, Harry and Mauss, Fabian and Balthasar, Michael and Magnusson, Ingemar},
  keyword      = {Combustion modelling
Diagnostic
Diesel enginen},
  language     = {eng},
  publisher    = {ARRAY(0x9ecfe68)},
  series       = {SAE technical paper series},
  title        = {Modeling Diesel Engine Combustion with Detailed Chemistry Using a Progress Variable Approach},
  year         = {2005},
}