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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
Article
  • 12 Downloads

Abstract

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 

Nomenclature

ABDC

after bottom dead center

ATDC

after top dead center

BBDC

before bottom dead center

BTDC

before top dead center

CFD

computational fluid dynamics

CO

carbon monoxide

DCC

dynamic cell clustering

DIT

diesel injection timing

dn

nozzle diameter

EVO

exhaust valve opening

HRR

heat release rate

IMEP

indicated mean effective pressure

IVC

intake valve closing

LSLB

low calorific value syngas lean burn

NOx

oxides of nitrogen

rpm

revolution per minute

TDC

top dead center

θdur

injection duration

θSOI

start of injection

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Notes

Acknowledgement

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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