Impact of Pilot Injection on Combustion and Emission Characteristics of a Low-Speed Two-Stroke Marine Diesel Engine

Xingyu Liang, Ziyang Liu, Kun Wang, Xiaohui Wang, Zhijie Zhu, Chaoyang Xu and Bo Liu
Additional contact information
Xingyu Liang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Ziyang Liu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Kun Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Xiaohui Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Zhijie Zhu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Chaoyang Xu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Bo Liu: China Shipbuilding Power Engineering Institute, Shanghai 201306, China

Energies, 2021, vol. 14, issue 2, 1-20

Abstract: Low-speed two-stroke marine diesel engines dominate the modern global long-distance transportation market; with the increasingly stringent regulations, the combustion and emissions of these engines is gaining intense interest. The primary objective of the present study was to understand the effects of air-fuel mixing by pilot injection strategy on the combustion and emission characteristics of the marine diesel engines through a numerical study. Specifically, a computational fluid dynamic (CFD) model was established and validated by experimental data for a typical low-speed two-stroke marine diesel engine. The combustion parameters under different stages were analyzed, including mean in-cylinder temperature and pressure, indicated thermal efficiency (ITE), indicated specific fuel consumption (ISFC), and distribution of fuel-air mixture. Results indicated that, due to the premixing effect, the pilot injection produced unburned soot from the main injection’s ignition as well as decrease the intervals between the middle and final stages of combustion, thus raising the in-cylinder temperature. The interaction between the reduction of soot particles resulted from the increased temperature, and the decrease of the stage intervals led to lower overall boundary heat loss, which improved the effective thermal efficiency. The pilot injection timing and quality, respectively, showed quadratic and linear impact modes on engine performance and emissions.

Keywords: marine diesel engine; pilot injection; engine combustion; emissions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/2/417/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/2/417/ (text/html)

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:gam:jeners:v:14:y:2021:i:2:p:417-:d:479811

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().