Article: Numerical simulation of gasoline-fuelled compression ignition combustion with late direct injection Journal: International Journal of Vehicle Design (IJVD) 2009 Vol.50 No.1/2/3/4 pp.3 - 34 Abstract: The auto-ignition characteristics of a charge mixture, which affects significantly the engine-out pollutant emissions, are dependent on fuel kinds as well as thermodynamic conditions and compositions of the charge mixture. In this work, numerical simulations of combustion of direct injection gasoline sprays in a conventional diesel engine using a multi-dimensional CFD code incorporating detailed oxidation chemistry of fuels, are presented and emissions of gasoline-fuelled engine operation are compared with those of diesel fuel. The results show that the combustion behaviour of direct injection (DI) gasoline sprays and their emission characteristics are successfully predicted and are in good agreement with experimental measurements under various operating conditions that have been reported in the literature. It is seen that NO<SUB align="right">x</SUB> and particulate emissions in gasoline combustion are significantly reduced compared to the corresponding diesel cases. The results also suggest possible expansion of operating conditions of DI gasoline compression ignition combustion. Inderscience Publishers - linking academia, business and industry through research

Title: Numerical simulation of gasoline-fuelled compression ignition combustion with late direct injection

Authors: Youngchul Ra, Jeong Eui Yun, Rolf D. Reitz

Addresses: Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, ERB#1016B, Madison, WI 53706, USA. ' Division of Mechatronics, Kangwon National University, 253 Gyo-dong, Samcheok-si, Kangwon-do 245711, South Korea. ' Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, ERB#1018A, Madison, WI 53706, USA

Abstract: The auto-ignition characteristics of a charge mixture, which affects significantly the engine-out pollutant emissions, are dependent on fuel kinds as well as thermodynamic conditions and compositions of the charge mixture. In this work, numerical simulations of combustion of direct injection gasoline sprays in a conventional diesel engine using a multi-dimensional CFD code incorporating detailed oxidation chemistry of fuels, are presented and emissions of gasoline-fuelled engine operation are compared with those of diesel fuel. The results show that the combustion behaviour of direct injection (DI) gasoline sprays and their emission characteristics are successfully predicted and are in good agreement with experimental measurements under various operating conditions that have been reported in the literature. It is seen that NO_x and particulate emissions in gasoline combustion are significantly reduced compared to the corresponding diesel cases. The results also suggest possible expansion of operating conditions of DI gasoline compression ignition combustion.

Keywords: compression ignition; direct injection; pollutant emissions; gasoline sprays; ignition delay; gasoline combustion; simulation; diesel engines; CFD; computational fluid dynamics; oxidation chemistry; particulate emissions; nitrogen oxide.

DOI: 10.1504/IJVD.2009.024966

International Journal of Vehicle Design, 2009 Vol.50 No.1/2/3/4, pp.3 - 34

Published online: 06 May 2009 *

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Title: Numerical simulation of gasoline-fuelled compression ignition combustion with late direct injection

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