Numerical Investigation to the Effect of Ethanol/Gasoline Ratio on Charge Cooling in an EDI+GPI Engine

Huang, Y; Hong, G; Huang, R

Numerical Investigation to the Effect of Ethanol/Gasoline Ratio on Charge Cooling in an EDI+GPI Engine

Huang, Y

Hong, G

Huang, R

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Publication Type:: Conference Proceeding
Citation:: SAE Technical Papers, 2014, 2014-October
Issue Date:: 2014-10-13

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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	Huang, R	en_US
dc.date.issued	2014-10-13	en_US
dc.identifier.citation	SAE Technical Papers, 2014, 2014-October	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35294
dc.identifier.uri	http://hdl.handle.net/10453/35300
dc.identifier.uri	http://hdl.handle.net/10453/35299
dc.identifier.uri	http://hdl.handle.net/10453/35298
dc.identifier.uri	http://hdl.handle.net/10453/35297
dc.identifier.uri	http://hdl.handle.net/10453/35296
dc.identifier.uri	http://hdl.handle.net/10453/35293
dc.identifier.uri	http://hdl.handle.net/10453/35295
dc.identifier.uri	http://hdl.handle.net/10453/32653
dc.description.abstract	Copyright © 2014 SAE International. The work reported in this paper contributes to understanding the effects of ethanol/gasoline ratio on mixture formation and cooling effect which are crucial in the development of EDI+GPI engine. The spray simulations were carried out using a commercial CFD code. The model was verified by comparing the numerical and experimental results of spray shapes in a constant volume chamber and cylinder pressure in an EDI+GPI research engine. The verified model was used to investigate the fuel vaporization and mixture formation of the EDI+GPI research engine. The effect of the ethanol/gasoline ratio on charge cooling has been studied. Compared with GPI only, EDI+GPI demonstrated stronger effect on charge cooling by decreased in-cylinder temperature. However, the cooling effect was limited by the low evaporation rate of the ethanol fuel due to its lower saturation vapour pressure than gasoline's in low temperature conditions. The cooling effect of EDI increased with the increase of ethanol/gasoline ratio until the ratio reached 58% (by volume). Further increase of ethanol/gasoline ratio did not improve the cooling effect, but left more liquid ethanol droplets in the combustion chamber by the time of spark. This could lead to incomplete combustion and explained the increased CO and HC emissions with the increase of ethanol content as reported in the experiments. The cooling potential and the completeness of ethanol evaporation were two completing factors that determine the final cooling effect of EDI. This implied the existence of ethanol/gasoline ratio 40-50% which can optimize the cooling effect and combustion performance.	en_US
dc.relation.ispartof	SAE Technical Papers	en_US
dc.relation.isbasedon	10.4271/2014-01-2612	en_US
dc.title	Numerical Investigation to the Effect of Ethanol/Gasoline Ratio on Charge Cooling in an EDI+GPI Engine	en_US
dc.type	Conference Proceeding
utslib.citation.volume	2014-October	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	Birmingham, UK
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	2014-October	en_US

Abstract:

Copyright © 2014 SAE International. The work reported in this paper contributes to understanding the effects of ethanol/gasoline ratio on mixture formation and cooling effect which are crucial in the development of EDI+GPI engine. The spray simulations were carried out using a commercial CFD code. The model was verified by comparing the numerical and experimental results of spray shapes in a constant volume chamber and cylinder pressure in an EDI+GPI research engine. The verified model was used to investigate the fuel vaporization and mixture formation of the EDI+GPI research engine. The effect of the ethanol/gasoline ratio on charge cooling has been studied. Compared with GPI only, EDI+GPI demonstrated stronger effect on charge cooling by decreased in-cylinder temperature. However, the cooling effect was limited by the low evaporation rate of the ethanol fuel due to its lower saturation vapour pressure than gasoline's in low temperature conditions. The cooling effect of EDI increased with the increase of ethanol/gasoline ratio until the ratio reached 58% (by volume). Further increase of ethanol/gasoline ratio did not improve the cooling effect, but left more liquid ethanol droplets in the combustion chamber by the time of spark. This could lead to incomplete combustion and explained the increased CO and HC emissions with the increase of ethanol content as reported in the experiments. The cooling potential and the completeness of ethanol evaporation were two completing factors that determine the final cooling effect of EDI. This implied the existence of ethanol/gasoline ratio 40-50% which can optimize the cooling effect and combustion performance.

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http://hdl.handle.net/10453/32653