The Effect of Combustion Swirl on the Combustion in a Diesel Engine

概要

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In order to investigate the effect of the timing of swirl creation on the combustion process in a Diesel engine, varying amounts of fuel were injected from two sets of fuel-injection equipments into the main and auxiliary combustion chambers respectively at different timings. A swirl was created in the main chamber by an outflow of gas from the auxiliary chamber. Swirl creation prior to the fuel injection into the main chamber brings a small improvement on the combustion state, but is accompanied by an unfavorably rapid and high pressure rise. Swirl creation after ignition is more effective in shortening the after-burning of fuel, as ascertained by the high-speed photography. When fuel is injected into the auxiliary chamber after TDC, the noiseless and smokeless combustion with fairly low peak pressure is materialized without the expense of fuel consumption.
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