Investigation to charge cooling effect of evaporation of ethanol fuel directly injected in a gasoline port injection engine

Huang, Y; Hong, G; Cheng, X; Huang, R

Investigation to charge cooling effect of evaporation of ethanol fuel directly injected in a gasoline port injection engine

Huang, Y

Hong, G

Cheng, X Huang, R

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Publication Type:: Conference Proceeding
Citation:: SAE Technical Papers, 2013, 11
Issue Date:: 2013-01-01

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Field	Value	Language
dc.contributor.author	Huang, Y https://orcid.org/0000-0001-9800-8788	en_US
dc.contributor.author	Hong, G https://orcid.org/0000-0002-1905-1161	en_US
dc.contributor.author	Cheng, X	en_US
dc.contributor.author	Huang, R	en_US
dc.date.issued	2013-01-01	en_US
dc.identifier.citation	SAE Technical Papers, 2013, 11	en_US
dc.identifier.issn	0148-7191	en_US
dc.identifier.uri	http://hdl.handle.net/10453/28409
dc.description.abstract	Ethanol direct injection plus gasoline port injection (EDI+GPI) is a new technology to make the use of ethanol fuel more effective and efficient in spark ignition engines. It takes the advantages of ethanol fuel, such as its greater latent heat of vaporization than that of gasoline fuel, to enhance the charge cooling effect and consequently to increase the compression ratio and improve the engine thermal efficiency. Experimental investigation has shown improvement in the performance of a single cylinder spark ignition engine equipped with EDI+GPI. It was inferred that the charge cooling enhanced by EDI played an important role. To investigate it, a CFD model has been developed for the experimentally tested engine. The Eulerian-Lagrangian approach and Discrete Droplet Model were used to model the evolution of the fuel sprays. The model was verified by comparing the numerical and experimental results of cylinder pressure during the intake and compression strokes. Mesh density and time step sensitivities have been tested. The verified model was used to investigate the charge cooling effect of EDI in terms of spatial and temporal distributions of cylinder temperature and fuel vapor fraction. Compared with GPI only, EDI+GPI demonstrated stronger effect on charge cooling by decreased in-cylinder temperature. The cooling effect was limited by the low evaporation rate of the ethanol fuel due to its lower saturation vapor pressure than gasoline's in low temperature conditions. Copyright © 2013 SAE International and Copyright © 2013 KSAE.	en_US
dc.relation.ispartof	SAE Technical Papers	en_US
dc.relation.isbasedon	10.4271/2013-01-2610	en_US
dc.title	Investigation to charge cooling effect of evaporation of ethanol fuel directly injected in a gasoline port injection engine	en_US
dc.type	Conference Proceeding
utslib.citation.volume	11	en_US
utslib.for	090201 Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)	en_US
utslib.for	0902 Automotive Engineering	en_US
utslib.for	0910 Manufacturing Engineering	en_US
dc.location.activity	Seoul, Korea	en_US
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 Civil and Environmental Engineering
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.publication-status	Published	en_US
pubs.volume	11	en_US

Abstract:

Ethanol direct injection plus gasoline port injection (EDI+GPI) is a new technology to make the use of ethanol fuel more effective and efficient in spark ignition engines. It takes the advantages of ethanol fuel, such as its greater latent heat of vaporization than that of gasoline fuel, to enhance the charge cooling effect and consequently to increase the compression ratio and improve the engine thermal efficiency. Experimental investigation has shown improvement in the performance of a single cylinder spark ignition engine equipped with EDI+GPI. It was inferred that the charge cooling enhanced by EDI played an important role. To investigate it, a CFD model has been developed for the experimentally tested engine. The Eulerian-Lagrangian approach and Discrete Droplet Model were used to model the evolution of the fuel sprays. The model was verified by comparing the numerical and experimental results of cylinder pressure during the intake and compression strokes. Mesh density and time step sensitivities have been tested. The verified model was used to investigate the charge cooling effect of EDI in terms of spatial and temporal distributions of cylinder temperature and fuel vapor fraction. Compared with GPI only, EDI+GPI demonstrated stronger effect on charge cooling by decreased in-cylinder temperature. The cooling effect was limited by the low evaporation rate of the ethanol fuel due to its lower saturation vapor pressure than gasoline's in low temperature conditions. Copyright © 2013 SAE International and Copyright © 2013 KSAE.

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http://hdl.handle.net/10453/28409