I205 FUEL-SPRAY CHARACTERISTICS OF HIGH PRESSURE GASOLINE INJECTION IN FLOWING FIELDS(Engine spray)

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The direct injection into the cylinders has been regarded as a way of the reduction in fuel consumption and pollutant emissions. The spray produced from the direct injector is of paramount importance in direct-injection spark-ignition engines in that the primary atomization process must meetthe requirement of quick and complete evaporation and combustion especially to prohibit the excessive HC emissions. The spray geometry must be stable and compact showing controlled mixture formation by taking a benefit from in-cylinder charge flows. The interaction between air flow and fuel spray was invest igated in a steady flow system embodied ina wind tunnel to simulate the variety of flow inside the cylinder of the direct-injection spark ignitionengine. The spray developments in flowing fields with the mean velocity up to 17m/s were at firstidentified by spray visualization. The direct Mie scattered images and Shadowgraph images presented the macroscopic view of the liquid sprays and the spatial distribution of vapor fields. The microscopic characteristics of the spray were investigated by the velocity and particle size measurements using aphase Doppler anemometer (PDA). The processes of atomization and evaporation with a GDI injector were observed and consequently utilized to construct the data-base for the spray and fuel-air mixing mechanism as a function of the flow characteristics. This could give the way of optimization between the flow formulation and injection schemes in direct-injection spark-ignition engines.
一般社団法人日本機械学会の論文
2000-10-01

I205 FUEL-SPRAY CHARACTERISTICS OF HIGH PRESSURE GASOLINE INJECTION IN FLOWING FIELDS(Engine spray)

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