Abstract
In direct injection diesel engines the intense swirling air motion in the cylinder is useful for a higher air fuel mixing rate. Therefore, we have investigated fuel spray motion in air flow with a uniform velocity distribution in order to explain the effect of the air swirl on the fuel spray motion in the cylinders of direct injection diesel engines, and concluded that the spray movement affected by the lateral air motion is controlled by the momentum of the fuel injection, the momentum of the air motion, the effective diameter of the fuel injection nozzle and factors of air entrainment. Then, the equation of the fuel spray motion locus in lateral air flow is obtained.
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