Numerical investigation of mixture preparation for AI combustion in a two-stroke engine

Wijesinghe, JS; Hong, G

Numerical investigation of mixture preparation for AI combustion in a two-stroke engine

Wijesinghe, JS Hong, G

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Publisher:: Cultural & Communication Publisher
Publication Type:: Conference Proceeding
Citation:: APAC 2009 - Proceedings of 15th Asia Pacific Automotive Engineering Conference, 2009
Issue Date:: 2009-01-01

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Field	Value	Language
dc.contributor.author	Wijesinghe, JS	en_US
dc.contributor.author	Hong, G https://orcid.org/0000-0002-1905-1161	en_US
dc.date	2009-10-26	en_US
dc.date.issued	2009-01-01	en_US
dc.identifier.citation	APAC 2009 - Proceedings of 15th Asia Pacific Automotive Engineering Conference, 2009	en_US
dc.identifier.uri	http://hdl.handle.net/10453/33226
dc.description.abstract	Computational Fluid Dynamics (CFD) offers an alternative technique to understand the in-cylinder gas behaviour of an internal combustion engine. In our experimental investigations, auto-ignition (AI) was achieved in a small two-stroke engine by internal exhaust gas recirculation (EGR) using an exhaust port valve to trap the burnt gas. A CFD model was developed, aiming to study the temperature and the distribution of the trapped burned gas prior to AI. The engine to be modelled was a 160cc single-cylinder piston ported two-stroke engine equipped with a butterfly valve in the exhaust pipe. The CFD model was developed using a commercial code. The turbulence model was RNG k-e. Experimental data were used to define the initial and boundary conditions. The model simulates the gas exchange process from the exhaust port opening to the point before the ignition. It was verified by comparing the numerical result of cylinder pressure with the experimental one. Then the verified numerical model was used to perform numerical simulations of the gas exchange process at various engine operating conditions. The effect of the exhaust port restriction, the intake valve opening and the engine speed on the temperature and the distribution of trapped burnt gas in cylinder were analysed. The simulation results suggested that the exhaust valve restriction had a stronger effect than the intake valve did. The numerical results for investigating the effect of the engine speed helped understand the AI operation region investigated in the experiments.	en_US
dc.publisher	Cultural & Communication Publisher	en_US
dc.relation.ispartof	APAC 2009 - Proceedings of 15th Asia Pacific Automotive Engineering Conference	en_US
dc.relation.ispartof	Asia Pacific Automotive Engineering Conference	en_US
dc.title	Numerical investigation of mixture preparation for AI combustion in a two-stroke engine	en_US
dc.type	Conference Proceeding
utslib.location	Hanoi, Vietnam	en_US
utslib.location.activity	Hanoi, Vietnam	en_US
utslib.for	0902 Automotive Engineering	en_US
utslib.for	091305 Energy Generation, Conversion and Storage Engineering	en_US
dc.location.activity	Hanoi, Vietnam
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access
pubs.consider-herdc	false	en_US
pubs.place-of-publication	Hanoi, Vietnam	en_US
pubs.publication-status	Published	en_US
pubs.start-date	2009-10-26	en_US

Abstract:

Computational Fluid Dynamics (CFD) offers an alternative technique to understand the in-cylinder gas behaviour of an internal combustion engine. In our experimental investigations, auto-ignition (AI) was achieved in a small two-stroke engine by internal exhaust gas recirculation (EGR) using an exhaust port valve to trap the burnt gas. A CFD model was developed, aiming to study the temperature and the distribution of the trapped burned gas prior to AI. The engine to be modelled was a 160cc single-cylinder piston ported two-stroke engine equipped with a butterfly valve in the exhaust pipe. The CFD model was developed using a commercial code. The turbulence model was RNG k-e. Experimental data were used to define the initial and boundary conditions. The model simulates the gas exchange process from the exhaust port opening to the point before the ignition. It was verified by comparing the numerical result of cylinder pressure with the experimental one. Then the verified numerical model was used to perform numerical simulations of the gas exchange process at various engine operating conditions. The effect of the exhaust port restriction, the intake valve opening and the engine speed on the temperature and the distribution of trapped burnt gas in cylinder were analysed. The simulation results suggested that the exhaust valve restriction had a stronger effect than the intake valve did. The numerical results for investigating the effect of the engine speed helped understand the AI operation region investigated in the experiments.

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http://hdl.handle.net/10453/33226