Abstract
The present thesis describes, demonstrates and discusses a developed method for numerical simulation of reacting and non-reacting turbulent flows in a flexible space-time-system. This method is applied to simulate the flow and combustion in a two dimensional axis symmetric piston cylinder of an Otto engine. The Eddy Dissipation Concept (EDC) of Magnussen is applied to predict the turbulent combustion. The newest version of this concept is described. This version is basically the same as the earlier model, only a minor change in the description of mass fraction of fine structure being able to react, now gives a slightly steeper turbulent flame front and a faster burnup. The k-{epsilon}-model used is extended with two additional terms which include compression/expansion effects due to piston movement and flame expansion and effects caused by pressure density interaction, generated by the flame. Calculations have been done for the complete four stroke cycle of a two dimensional axis symmetric simple flat headed pancake piston engine. The unsophisticated geometry has been selected for reasons of simplicity and saving computer time, addressing the main efforts to the treatment and understanding of the modeling of the non-resolvable physical processes of the complex flow and combustion during the four strokes
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Citation Formats
Grimsmo, B.
Numerical simulation of turbulent flow and combustion in a four stroke homogeneous charge internal combustion engine.
Norway: N. p.,
1991.
Web.
Grimsmo, B.
Numerical simulation of turbulent flow and combustion in a four stroke homogeneous charge internal combustion engine.
Norway.
Grimsmo, B.
1991.
"Numerical simulation of turbulent flow and combustion in a four stroke homogeneous charge internal combustion engine."
Norway.
@misc{etde_10131107,
title = {Numerical simulation of turbulent flow and combustion in a four stroke homogeneous charge internal combustion engine}
author = {Grimsmo, B}
abstractNote = {The present thesis describes, demonstrates and discusses a developed method for numerical simulation of reacting and non-reacting turbulent flows in a flexible space-time-system. This method is applied to simulate the flow and combustion in a two dimensional axis symmetric piston cylinder of an Otto engine. The Eddy Dissipation Concept (EDC) of Magnussen is applied to predict the turbulent combustion. The newest version of this concept is described. This version is basically the same as the earlier model, only a minor change in the description of mass fraction of fine structure being able to react, now gives a slightly steeper turbulent flame front and a faster burnup. The k-{epsilon}-model used is extended with two additional terms which include compression/expansion effects due to piston movement and flame expansion and effects caused by pressure density interaction, generated by the flame. Calculations have been done for the complete four stroke cycle of a two dimensional axis symmetric simple flat headed pancake piston engine. The unsophisticated geometry has been selected for reasons of simplicity and saving computer time, addressing the main efforts to the treatment and understanding of the modeling of the non-resolvable physical processes of the complex flow and combustion during the four strokes of the Otto engine cycle. The results obtained show good agreement with experimental data found in the literature. The thesis demonstrates and discusses the applicability of the EDC concept for calculations of combustion in engines. It also discusses the application of the extended k-{epsilon}-model and demonstrates its effect on the combustion. The thesis also discusses and gives comments on many general topics connected to the treatment and basic understanding of engine turbulence in numerical calculation. 97 refs., 92 figs., 2 tabs.}
place = {Norway}
year = {1991}
month = {Dec}
}
title = {Numerical simulation of turbulent flow and combustion in a four stroke homogeneous charge internal combustion engine}
author = {Grimsmo, B}
abstractNote = {The present thesis describes, demonstrates and discusses a developed method for numerical simulation of reacting and non-reacting turbulent flows in a flexible space-time-system. This method is applied to simulate the flow and combustion in a two dimensional axis symmetric piston cylinder of an Otto engine. The Eddy Dissipation Concept (EDC) of Magnussen is applied to predict the turbulent combustion. The newest version of this concept is described. This version is basically the same as the earlier model, only a minor change in the description of mass fraction of fine structure being able to react, now gives a slightly steeper turbulent flame front and a faster burnup. The k-{epsilon}-model used is extended with two additional terms which include compression/expansion effects due to piston movement and flame expansion and effects caused by pressure density interaction, generated by the flame. Calculations have been done for the complete four stroke cycle of a two dimensional axis symmetric simple flat headed pancake piston engine. The unsophisticated geometry has been selected for reasons of simplicity and saving computer time, addressing the main efforts to the treatment and understanding of the modeling of the non-resolvable physical processes of the complex flow and combustion during the four strokes of the Otto engine cycle. The results obtained show good agreement with experimental data found in the literature. The thesis demonstrates and discusses the applicability of the EDC concept for calculations of combustion in engines. It also discusses the application of the extended k-{epsilon}-model and demonstrates its effect on the combustion. The thesis also discusses and gives comments on many general topics connected to the treatment and basic understanding of engine turbulence in numerical calculation. 97 refs., 92 figs., 2 tabs.}
place = {Norway}
year = {1991}
month = {Dec}
}