The effect of ignition energy on the lean combustion limitation in high compression ratio engines

Zuowen Liu and Zhaolei Zheng

Energy, 2024, vol. 301, issue C

Abstract: This study examined the impact of ignition energy for various loads on extending the limitations of lean combustion (LLC) and enhancing thermal efficiency using a high compression ratio (CR = 17) engine. It combined high compression ratio design、lean burn and high ignition energy to achieve more than 50 % indicated thermal efficiency. The findings indicated that a 424 mJ ignition energy proved helpful in reducing the ignition delay (CA0-10), widening the LLC to λ = 2.1, and achieving the highest thermal efficiency of 50.3 % at λ = 1.9 with lower exhaust loss and heat transfer loss when IMEP raised from 8.5 bar to 10 bar. Nevertheless, due to the high coefficient of variation of indicated mean effective pressure (COVIMEP), the constraints of lean combustion only reached λ = 1.45 and λ = 1.3 under IMEP = 12 bar and 13 bar, and its corresponding thermal efficiency was 45.1 % and 43.0 %, respectively. In terms of emissions, NOx was more sensitive to a bigger rise in ignition energy than other gases, and the variation of CO, THC, and NOx did not connect to a slight increase in ignition energy. The CO, THC, and NOx also tended to stay unchanged in ultra-lean conditions, remaining at about 900 ppm, 2797 ppm, and 38 ppm, respectively.

Keywords: Ignition energy; High compression ratio; Thermal efficiency; Limitation of lean combustion; Combustion stability (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544224013641
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:301:y:2024:i:c:s0360544224013641

DOI: 10.1016/j.energy.2024.131591

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().