Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions

Taib Iskandar Mohamad, How Heoy Geok

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The combustion characteristics of compressed natural gas (CNG) in a direct microchannel-injection engine under various operating conditions were investigated. In this study, a novel idea for direct CNG microchannel injection was realized with spark plug fuel injector (SPFI). It is a device developed to convert engine to CNG direct injection (DI) operation with minimal cost and technical simplicity. It was installed and tested on a Ricardo E6 single cylinder engine with compression ratio of 10.5:1 without modification on the original engine structure. The engine test was carried out under various operation conditions at 1100 rpm. Burning rates of CNG were measured using normalized combustion pressure method by which the normalized pressure rise due to combustion is equivalent to the mass fraction burned (MFB) at the specific crank angle. The results showed that the MFB of CNG direct injection is substantially faster but initially slower than the ones of port injection. The optimal fuel injection and ignition timings are 190 °CA ATDC and 25 °CA BTDC respectively. The optimal injection pressure was 6 MPa. Combustion durations were not changed with different injection pressures but ignition delay was affected. There was no direct correlation between injection pressure and ignition delay which is most probably due to the effect of charge flow difference. Changing mixture stoichiometry affects the magnitude of ignition delay. Combustion duration, on the other hand increases with leaner mixture.

    Original languageEnglish
    Title of host publicationApplied Mechanics and Materials
    Pages793-798
    Number of pages6
    Volume315
    DOIs
    Publication statusPublished - 2013
    Event3rd International Conference on Mechanical and Manufacturing Engineering, ICME 2012 -
    Duration: 20 Nov 201221 Nov 2012

    Publication series

    NameApplied Mechanics and Materials
    Volume315
    ISSN (Print)16609336
    ISSN (Electronic)16627482

    Other

    Other3rd International Conference on Mechanical and Manufacturing Engineering, ICME 2012
    Period20/11/1221/11/12

    Fingerprint

    Compressed natural gas
    Microchannels
    Engines
    Ignition
    Direct injection
    Spark plugs
    Fuel injection
    Engine cylinders
    Stoichiometry
    Costs

    Keywords

    • CNG
    • Direct injection
    • Flame propagation
    • Ignition delay
    • Indicated performance
    • Mass fraction burnt

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Mohamad, T. I., & Geok, H. H. (2013). Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions. In Applied Mechanics and Materials (Vol. 315, pp. 793-798). (Applied Mechanics and Materials; Vol. 315). https://doi.org/10.4028/www.scientific.net/AMM.315.793

    Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions. / Mohamad, Taib Iskandar; Geok, How Heoy.

    Applied Mechanics and Materials. Vol. 315 2013. p. 793-798 (Applied Mechanics and Materials; Vol. 315).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Mohamad, TI & Geok, HH 2013, Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions. in Applied Mechanics and Materials. vol. 315, Applied Mechanics and Materials, vol. 315, pp. 793-798, 3rd International Conference on Mechanical and Manufacturing Engineering, ICME 2012, 20/11/12. https://doi.org/10.4028/www.scientific.net/AMM.315.793
    Mohamad TI, Geok HH. Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions. In Applied Mechanics and Materials. Vol. 315. 2013. p. 793-798. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.315.793
    Mohamad, Taib Iskandar ; Geok, How Heoy. / Combustion characteristics of compressed natural gas in a direct microchannel-injection engine under various operating conditions. Applied Mechanics and Materials. Vol. 315 2013. pp. 793-798 (Applied Mechanics and Materials).
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