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Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine

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posted on 05.10.2018 by Lei Zhou, Kai Dong, Jianxiong Hua, Haiqiao Wei, Rui Chen, Yiyong Han
Spark assisted compression ignition (SACI) is a proven method for extending the load range and controlling the combustion phase of homogeneous charge compression ignition (HCCI) while maintaining high thermal efficiency. However, the occurrence of abnormal combustion, such as knock, limits the improvement of efficiency in SACI combustion. In this study, the effects of a coupling strategy, which combines internal/external exhaust gas recirculation (i & e-EGR) and split injection, on knock suppression in SACI mode were investigated in a high-compression-ratio, single-cylinder gasoline engine with a fully variable valve system. During the experiment, the mass of intake air remained constant while e-EGR was added. The results show that the coupling strategy combines the advantages of e-EGR and split injection, providing an effective method for resisting knock and improving engine efficiency. The results also demonstrate that applying e-EGR to SACI combustion significantly decreases the knock intensity by effectively reducing the in-cylinder temperature. In addition, the effect of split injection on knock suppression is related to the initial in-cylinder temperature and fuel stratification. With high initial in-cylinder temperature, the relationship between knock probability and split injection timing is non-monotonic. However, with low initial in-cylinder temperature, the capacity of resisting knock monotonically increases with the delay of secondary injection timing.

Funding

This work is supported by National Natural Science Foundation of China (Grant Nos. 91641203, 91741119, 51506118). The authors would also like to thank the support of the National Key R&D Program of China (2017YFB0103400).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Applied Thermal Engineering

Volume

145

Issue

2018

Pages

98 - 109

Citation

ZHOU, L. ... et al, 2018. Effects of applying EGR with split injection strategy on combustion performance and knock resistance in a spark assisted compression ignition (SACI) engine. Applied Thermal Engineering, 145, pp.98-109.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Applied Thermal Engineering and the definitive published version is available at https://doi.org/10.1016/j.applthermaleng.2018.09.001.

Acceptance date

01/09/2018

Publication date

2018-09-01

ISSN

1359-4311

Language

en

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