The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection

Taib Iskandar Mohamad, M. Harrison, M. Jermy, H. G. How

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    A spark plug fuel injector (SPFI), which is a combination of a fuel injector and a spark plug was developed with the aim to convert any gasoline port injection spark ignition engine to gaseous fuel direct injection (Mohamad in Development of a spark plug fuel injector for direct injection of methane in spark\ ignition engine. PhD thesis, Cranfield University, 2006). A direct fuel injector is combined with a spark plug using specially fabricated bracket connected to a fuel pipe and a fuel path running along the periphery of a spark plug body to deliver the injected fuel to the combustion chamber. The injection nozzle of SPFI is significantly bigger than normal direct fuel injector nozzles. Therefore, it is important to understand the effect of such a configuration on the injection process and subsequently the air-fuel mixing behaviour inside the combustion chamber. The flow was visualized using the planar laser-induced fluorescent technique. For safety reasons, nitrogen was used as fuel substitute. Nitrogen at 50, 60 and 80 bar pressure was seeded with acetone as a flow tracer and injected into a bomb containing pressurised nitrogen. Bomb pressure was varied to simulate the pressure inside combustion cylinder during the compression stroke where actual injections in engine experiments will take place. The shape and depth of tip penetration of the gas jet were measured. Results show that the gas jet follows the behaviour suggested by vortex ball model (Turner in Mechanics 13:356-369, 1962). The cone angle and the maximum jet width of the fully developed gas jets from the SPFI injection are 23° and 25 mm, respectively regardless of the injection pressures. The penetration lengths of the fully developed jets are between 90 and 100 mm at 8-14 ms after the start of injection, depending on the bomb and injection pressure. Jet penetration is directly proportional to the injection pressure but inversely proportional to the cylinder or bomb pressure. The penetration lengths indicate that sufficient distance should be travelled by the gas jet for satisfactory air-fuel mixing in the engine.

    Original languageEnglish
    Pages (from-to)121-131
    Number of pages11
    JournalJournal of Visualization
    Volume13
    Issue number2
    DOIs
    Publication statusPublished - May 2010

    Fingerprint

    spark plugs
    Spark plugs
    fuel injection
    gas jets
    Fuel injection
    injectors
    injection
    Gases
    engines
    penetration
    spark ignition
    combustion chambers
    Direct injection
    Engine cylinders
    nitrogen
    Combustion chambers
    Nitrogen
    Internal combustion engines
    nozzles
    Nozzles

    Keywords

    • Air-fuel mixing
    • Direct fuel injection
    • Flow visualization
    • Gaseous fuel

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electrical and Electronic Engineering

    Cite this

    The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection. / Mohamad, Taib Iskandar; Harrison, M.; Jermy, M.; How, H. G.

    In: Journal of Visualization, Vol. 13, No. 2, 05.2010, p. 121-131.

    Research output: Contribution to journalArticle

    Mohamad, Taib Iskandar ; Harrison, M. ; Jermy, M. ; How, H. G. / The structure of the high-pressure gas jet from a spark plug fuel injector for direct fuel injection. In: Journal of Visualization. 2010 ; Vol. 13, No. 2. pp. 121-131.
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