Slit Nozzle Injector for A New Concept of Direct Injection SI Gasoline Engine

Takeda, Keiso; Sugimoto, Tomojiro; Tsuchiya, Tomihisa; Ogawa, Minoru; Ueda, Shinji; Yoneshige, Kazuhiro

doi:10.4271/2000-01-1902

Cited by 17 publications

(1 citation statement)

References 3 publications

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“…For DISI engines the mass injected per injection is metered by controlling the duration of the injection, at given gauge pressure, for a given atomizer geometry. Many attempts have been made to develop the various different types of atomizers [8][9][10]. However, changing the spray characteristics to respond to changes in air temperature or pressure by either modifying the atomizer geometry or dynamically controlling the gauge pressure is extremely impractical.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of electrically charged transient evaporating sprays

Shrimpton

Laoonual

2006

Numerical Meth Engineering

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SUMMARYThe evolution of an evaporating spray plume typical of those under consideration for use in direct injection spark ignition (DISI) engines, for early and late fuel injection strategies is investigated. Here the effect of electric charge, present on individual drops, upon the spray dispersal and evaporation rate is investigated with the aim of optimizing these parameters with respect to typical engine timescales and injection strategy. The predictions suggest that applying electric charge to drops in sprays injected early into the intake stroke does not have a beneficial effect. The spray evaporation rate is not significantly enhanced, and the long time interval between fuel injection and ignition actually promotes spray wall deposition. Conversely, applying electric charge to sprays injected late encourages secondary atomization and the increase in surface area greatly improves the evaporation rate. This is also true at higher engine speeds, corresponding to a much reduced time between fuel injection and ignition. Therefore it is suggested that the selective use of electric charge is viable way of tuning the spray character without effecting fuel metering when moving from an early to a late injection strategy in DISI engines when variable loads are required.

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Section: Introductionmentioning

confidence: 99%

Dynamics of electrically charged transient evaporating sprays

Shrimpton

Laoonual

2006

Numerical Meth Engineering

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A study of mixture formation processes in direct injection stratified charge gasoline engines by quantitative laser-induced fluorescence imaging and the infrared absorption method

Itoh

Kakuho

Hiraya

et al. 2006

International Journal of Engine Research

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Mixture formation processes were investigated of three types of direct injection stratified charge gasoline engine based on wall-guided, air-guided, and spray-guided concepts. Temporal and spatial variations of fuel concentration in the combustion chamber were measured by laser diagnostics such as quantitative laser-induced fluorescence (LIF) imaging and infrared absorption methods on a single-cylinder optical engine. It was found from the experiments that the direct injection gasoline engines based on both the wall-guided and air-guided concepts have long time intervals between the end of injection timing and ignition timing, and this demands early injection and ignition timings in the compression stroke, resulting in lower thermal efficiencies than those of the spray-guided concept. As for the spray-guided concept, fuel is ignited immediately after the end of injection, which enables near TDC (top dead centre) combustion, allowing lower fuel consumption than the other two. However, the condition for stable ignition and combustion achieved with the spray-guided concept is very narrow in terms of injection and ignition timings, so it is essential to widen the condition in order to make the concept a reality.

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