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Experimental study of combustion strategy for jet ignition on a natural gas engine

Zhao, Ziqing and Wang, Zhi and Qi, Yunliang and Cai, Kaiyuan and Li, Fubai (2022) Experimental study of combustion strategy for jet ignition on a natural gas engine. International Journal of Engine Research, 23 (1). pp. 104-119. ISSN 1468-0874. doi:10.1177/1468087420977751.

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To explore a suitable combustion strategy for natural gas engines using jet ignition, lean burn with air dilution, stoichiometric burn with EGR dilution and lean burn with EGR dilution were investigated in a single-cylinder natural gas engine, and the performances of two kinds of jet ignition technology, passive jet ignition (PJI) and active jet ignition (AJI), were compared. In the study of lean burn with air dilution strategy, the results showed that AJI could extend the lean limit of excess air ratio (λ) to 2.1, which was significantly higher than PJI’s 1.6. In addition, the highest indicated thermal efficiency (ITE) of AJI was shown 2% (in absolute value) more than that of PJI. Although a decrease of NO_x emission was observed with increasing λ in the air dilution strategy, THC and CO emissions increased. Stoichiometric burn with EGR was proved to be less effective, which can only be applied in a limited operation range and had less flexibility. However, in contrast to the strategy of stoichiometric burn with EGR, the strategy of lean burn with EGR showed a much better applicability, and the highest ITE could achieve 45%, which was even higher than that of lean burn with air dilution. Compared with the most efficient points of lean burn with pure air dilution, the lean burn with EGR dilution could reduce 78% THC under IMEP = 1.2 MPa and 12% CO under IMEP = 0.4 MPa. From an overall view of the combustion and emission performances under both low and high loads, the optimum λ would be from 1.4 to 1.6 for the strategy of lean burn with EGR dilution.

Item Type:Article
Related URLs:
URLURL TypeDescription
Zhao, Ziqing0000-0001-8362-5724
Wang, Zhi0000-0001-5932-9124
Additional Information:© 2021 Institution of Mechanical Engineers. First Published December 6, 2020.
Funding AgencyGrant Number
National Key Research and Development Program of China2016YFB0101402
National Natural Science Foundation of China21761142012
Subject Keywords:Jet ignition, lean burn, EGR, natural gas engine, combustion strategy
Issue or Number:1
Record Number:CaltechAUTHORS:20210611-084826459
Persistent URL:
Official Citation:Zhao, Ziqing, et al. “Experimental Study of Combustion Strategy for Jet Ignition on a Natural Gas Engine.” International Journal of Engine Research, vol. 23, no. 1, Jan. 2022, pp. 104–119, doi:10.1177/1468087420977751
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109482
Deposited By: Tony Diaz
Deposited On:11 Jun 2021 17:02
Last Modified:22 Dec 2021 18:06

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