Pre-chamber combustion system for heavy-duty engines for operating dual fuel and diesel modes

•A combined combustion model was established for methane and diesel combustion simulation.•Combustion process in heavy-duty engine with pre-chamber occurred in two stages.•In dual fuel mode and diesel mode, emission characteristics are analyzed.•Effect of pre-chamber design parameters for heavy-duty...

Full description

Saved in:
Bibliographic Details
Published in:Energy conversion and management 2022-03, Vol.255, p.115365, Article 115365
Main Authors: Shin, Jisoo, Choi, Jonghui, Seo, Jaeyeob, Park, Sungwook
Format: Article
Language:English
Subjects:
CFD
Combustion
Combustion chambers
Combustion stability
Design parameters
Diesel
Dual fuel
Emission analysis
Emission standards
Emissions
Engines
Environmental regulations
Heavy-duty engine
Indirect injection
Marine vehicle
Nitrogen oxides
Nozzle design
Pre-chamber
Soot
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•A combined combustion model was established for methane and diesel combustion simulation.•Combustion process in heavy-duty engine with pre-chamber occurred in two stages.•In dual fuel mode and diesel mode, emission characteristics are analyzed.•Effect of pre-chamber design parameters for heavy-duty engines were investigated. With the increase in heavy-duty engines, an enhanced combustion concept is necessary to meet stringent environmental regulations. Pre-chamber combustion systems can be used to improve combustion stability and emissions, and their design parameters are important because they affect the jet properties and engine performance. Therefore, this study investigates the combustion and emission characteristics of a pre-chamber combustion system for heavy-duty engines using a CFD program to determine the optimal design for engine performance. The simulation was conducted with an engine speed of 720 rpm and a 100% load condition for both dual fuel and diesel-only operation modes. Results indicate that the optimal pre-chamber nozzle design parameters include a hole diameter of 2.4 cm, 4 holes, and a direction angle of 60 deg. Compared with a conventional engine, the gross IMEP for an engine with a pre-chamber combustion system increased up to 0.8%, and the THC emissions was significantly reduced by preventing methane slip in dual-fuel mode. Additionally, NOx production was reduced by 50% in diesel mode. However, the NOx in dual-fuel mode and the soot in diesel mode were deteriorated. Therefore, engine operating strategies for pre-chamber combustion systems should be investigated as future work.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2022.115365