International Journal of Automotive Technology

, Volume 20, Issue 5, pp 933–942 | Cite as

Numerical Study of the Combustion Characteristics in a Syngas-diesel Dual-fuel Engine under Lean Condition

  • Abubaker Ahmed Mohammed Mohammed Ali
  • Kabbir Ali
  • Changup Kim
  • Yonggyu Lee
  • Seungmook Oh
  • Kiseong KimEmail author


The aim of this study was to investigate the combustion characteristics of a syngas-diesel dual fuel engine operates in very lean fuel-air mixture conditions. 3D CFD simulation combined with chemical kinetics were used for analysis. The main parameter for this study was the hydrogen content in the syngas. To simulate the combustion for the dual fuel engine, a new dual-fuel chemical kinetics set was used that was constituted by merging the two chemical kinetics sets: n-heptane (173 species), and Gri-mech 3.0 (53 species) for natural gas. The calculation results were in good agreements with the experimental results. Most of the diesel fuel burned as premixed combustion mode. When the hydrogen concentration was high, as in syngas45, most of the syngas in the piston bowl and squish region, except near the cylinder wall, was combusted in the vicinity of TDC; but when hydrogen concentration was low, as in syngas25, flame propagation to the central region of the piston was delayed, which led to an increase of time loss and unburned syngas emission. Due to the strong reverse squish flow, the syngas composition did not affect the flame arrival time at the cylinder wall through the squish area by much.

Key words

LSLB dual-fuel engine CFD simulation Chemical kinetics Lean combustion Syngas Hydrogen content 



after bottom dead center


after top dead center


before bottom dead center


before top dead center


computational fluid dynamics


carbon monoxide


dynamic cell clustering


diesel injection timing


nozzle diameter


exhaust valve opening


heat release rate


indicated mean effective pressure


intake valve closing


low calorific value syngas lean burn


oxides of nitrogen


revolution per minute


top dead center


injection duration


start of injection


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This work was supported by the National Research Council of Science and Technology (NST) grant by the Korean government (MSIT) (No.CAP-16-06-KIER).


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Copyright information

© KSAE 2019

Authors and Affiliations

  • Abubaker Ahmed Mohammed Mohammed Ali
    • 1
  • Kabbir Ali
    • 1
  • Changup Kim
    • 2
  • Yonggyu Lee
    • 2
  • Seungmook Oh
    • 2
  • Kiseong Kim
    • 1
    Email author
  1. 1.Department of Mechanical Design EngineeringChonnam National UniversityJeonnamKorea
  2. 2.Green Power LaboratoryKorea Institute of Machinery & MaterialsDaejeonKorea

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