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

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posted on 2023-06-08, 15:18 authored by Pavlos Dimitriou, William WangWilliam Wang, Jun Peng, Li Cheng, Matthias Wellers, Bo Gao
With a view to understanding the air-fuel mixing behavior 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.

Funding

SCODECE - Smart COntrol and Diagnosis for Economic and Clean Engines.(Interreg 2 Seas); G0271; EUROPEAN UNION; 05-025-SCODECE

History

Publication status

  • Published

File Version

  • Published version

Journal

SAE International Journal of Engines

ISSN

1946-3936

Publisher

SAE

Issue

4

Volume

7

Page range

2045-2060

Department affiliated with

  • Engineering and Design Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-04-27

First Open Access (FOA) Date

2016-04-27

First Compliant Deposit (FCD) Date

2016-04-27

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