This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Comparison Between Single-Step and Two-Step Chemistry in a Compression Ignition Free Piston Engine
Technical Paper
2000-01-2937
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The focus of this paper is to compare results from 3D combustion simulations when using either a single-step or a two-step description of the chemistry of combustion in a two stroke free piston diesel engine.
To reduce the computational cost, only one sector of the whole cylinder is computed, i.e. one fuel spray. The simulation starts after the exhaust ports are closed and ends before the exhaust ports opening. The fuel injection is described by a Lagrangian method where the break up and interaction of the droplets are taken into account as well as droplet wall interaction and evaporation. Turbulence is modeled using the standard high Reynolds number k-ε model. The combustion of fuel vapor is modeled by the the Eddy Dissipation Combustion Model (EDCM). In the case of two-step chemistry, the combustion of CO is taken into account. The kinetic rate of CO combustion is determined from a global expression.
Recommended Content
Topic
Citation
Kaario, O., "Comparison Between Single-Step and Two-Step Chemistry in a Compression Ignition Free Piston Engine," SAE Technical Paper 2000-01-2937, 2000, https://doi.org/10.4271/2000-01-2937.Also In
References
- Gosman, A. D. Ioannides, S. I. Aspects of computer simulation of liquid-fuelled combustors AIAA J. Energy 7 6 482 490 1983
- Grasso, F. Wey, M.J. Bracco, F.V. Abraham, J. Three-dimensional computations of flows in a stratified-charge rotary engine SAE paper 870409 1987
- Hergar, C. Barths, H. Peters, N. Modeling the combustion in a small-bore diesel engine using a method based on representative interactive flamelets SAE paper 1999-01-3550 1999
- Howard, J.B. Williams, G.C. Fine, D.H. Kinetics of carbon monoxide oxidation in post flame gases Fourteenth Symposium (International) on Combustion 975 986 The Combustion Institute Pittsburgh 1972
- Magnussen, B.F. Hjertager, B.H. On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion Sixteenth Symposium (International) on Combustion 719 729 The combustion institute Pittsburgh 1976
- O'Rourke, P.J. Collective drops effects on vaporising liquid sprays University of Princeton 1981
- Ranz, W.E. Marshall, W.R. Evaporation from drops - Parts I and II Chem. Eng. Prog. 48 3 1952
- Taskinen, P. Paattilammi, T. Karvinen, R. Liljenfeldt, G. Salminen, H. J. CFD based combustion simulation of a large medium speed diesel engine 3 rd international Conference, ICE97, Internal Combustion Engines: Experiments and Modeling 139 144 Capri, Italy 1997
- Reitz, R.D. Diwakar, R. Effects of drop breakup on fuel sprays SAE paper 860469 1986
- Zanforlin, S. Reitz, R. D. Gentili, R. Studying the roles of kinetics and turbulence in the simulation of diesel combustion by means of an extended characteristic-time-model SAE paper 1999-01-1177 1999