A Numerical Study on Combustion and Emission Characteristics of a Medium-Speed Diesel Engine Using In-Cylinder Cleaning Technologies

Shuang He, Bao-Guo Du, Li-Yan Feng, Yao Fu, Jing-Chen Cui and Wu-Qiang Long
Additional contact information
Shuang He: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Bao-Guo Du: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Li-Yan Feng: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Yao Fu: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Jing-Chen Cui: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Wu-Qiang Long: Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China

Energies, 2015, vol. 8, issue 5, 1-20

Abstract: In order to clarify the potential of internal purification methods on medium speed diesel engines to meet the IMO Tier III nitrogen oxide (NO x ) emission regulations, combined 1-D engine working cycle simulation and 3-D CFD simulation were conducted to predict the performance and emissions of the engine under different valve close timings, geometric compression ratios, injection timings, and Exhaust Gas Recirculation (EGR) rates. The numerical results show that, as the inlet valve close timing is advanced, NO x is reduced by as much as 27%, but the peak of premixed combustion heat release rate is increased; this can weaken the ability to reduce NO x with the Miller cycle. Moreover, the peak of premixed combustion heat release rate is reduced when the geometric compression ratio is increased to 15.4, and linking with injection timing by delaying 6°CA can further reduce NO x by 55.3% from the baseline. Finally, over 80% NO x reduction can be achieved when the above schemes are combined with over 15% EGR. The NO x and soot can be reduced simultaneously by using moderate Miller cycle combination with moderate EGR, and the results show a large reduction of NO x and moderate reduction of soot. This can be a feasible technical solution to meet Tier III regulations.

Keywords: medium-speed diesel engine; Miller cycle; EGR; NO x emissions; numerical simulation (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: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/8/5/4118/pdf (application/pdf)
https://www.mdpi.com/1996-1073/8/5/4118/ (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:8:y:2015:i:5:p:4118-4137:d:49334

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 ().