Analysis of diesel engine in-cylinder air-fuel mixing with homogeneity factor: combined effects of pilot injection strategies and air motion

Dimitriou, Pavlos, Wang, William, Peng, Jun, Cheng, Li, Wellers, Matthias and Gao, Bo (2014) Analysis of diesel engine in-cylinder air-fuel mixing with homogeneity factor: combined effects of pilot injection strategies and air motion. SAE International Journal of Engines, 7 (4). pp. 2045-2060. ISSN 1946-3944

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Abstract

With a view to understanding the air-fuel mixing behaviour and the effects of the mixture quality on the emissions formation and engine performance, a new quantitative factor of the in-cylinder air-fuel homogeneity named Homogeneity Factor (HF) has been developed. Its characteristics under various injection conditions and air swirl motions within the cylinder have been investigated with CFD simulation. The results have shown that air-fuel homogeneity is essentially affected by the spatial and temporal fuel distribution within the combustion chamber. Higher injection pressure, longer dwell time and increased pilot fuel quantities can contribute to better mixing quality resulting in increased HF and optimum engine performance with low fuel consumption and soot emissions. With regard to the in-cylinder air motion, increasing swirl ratio enhances the air-fuel mixing quality which has been reflected in the variation of the HF. As a result, increased in-cylinder pressure and temperature caused by the optimized air-fuel mixing improved the combustion efficiency.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL0001 Motor vehicles.Cycles
Depositing User: Li Cheng
Date Deposited: 27 Apr 2016 11:09
Last Modified: 11 Mar 2017 09:55
URI: http://sro.sussex.ac.uk/id/eprint/45557

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Project NameSussex Project NumberFunderFunder Ref
SCODECE - Smart COntrol and Diagnosis for Economic and Clean Engines.(Interreg 2 Seas)G0271EUROPEAN UNION05-025-SCODECE