Numerical analysis of the combustion process in a four-stroke compressed natural gas engine with direct injection system

Wendy Hardyono Kurniawan, Shahrir Abdullah

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this paper, a numerical study to simulate and analyze the combustion process occurred in a compressed natural gas direct injection (CNG-DI) engine by using a multi-dimensional computational fluid dynamics (CFD) code was presented. The investigation was performed on a single cylinder of the 1.6-liter engine running at wide open throttle at a fixed speed of 2000 rpm. The mesh generation was established via an embedded algorithm for moving meshes and boundaries for providing a more accurate transient condition of the operating engine. The combustion process was characterized with the eddy-break-up model of Magnussen for unpremixed or diffusion reaction. The modeling of gaseous fuel injection was described to define the start and end of injection timing. The utilized ignition strategy into the computational mesh was also explained to obtain the real spark ignition timing. The natural gas employed is considered to be 100% methane (CH4) with three global step reaction scheme. The CFD simulation was started from the intake valves opening until the time before exhaust valves opening. The results of CFD simulation were then compared with the data obtained from the single-cylinder engine experiment and showed a close agreement. For verification purpose, comparison between numerical and experimental work are in the form of average in-cylinder pressure, engine power as well as emission level of CO and NO.

Original languageEnglish
Pages (from-to)1937-1945
Number of pages9
JournalJournal of Mechanical Science and Technology
Volume22
Issue number10
DOIs
Publication statusPublished - Oct 2008

Fingerprint

Compressed natural gas
Gas engines
Direct injection
Numerical analysis
Engine cylinders
Engines
Computational fluid dynamics
Ignition
Intake valves
Mesh generation
Methane
Fuel injection
Computer simulation
Carbon Monoxide
Electric sparks
Natural gas
Experiments

Keywords

  • Combustion
  • Compressed natural gas
  • Computational fluid dynamics
  • Diffusion reaction
  • Direct injection
  • Ignition

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Numerical analysis of the combustion process in a four-stroke compressed natural gas engine with direct injection system. / Kurniawan, Wendy Hardyono; Abdullah, Shahrir.

In: Journal of Mechanical Science and Technology, Vol. 22, No. 10, 10.2008, p. 1937-1945.

Research output: Contribution to journalArticle

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