Abstract
In mixture formation process relevant to combustion and harmful matter formation process in a DI diesel engine, the turbulence effect appears from the start of break up of fuel droplets to ignitable mixture formation process. In this study, to clarify the effect of turbulence on mixture formation process, Particle Image Velocimetry (PIV) was applied to fuel droplets for investigation of the droplets behavior. The experimental results show that : Near the spray axis, droplets velocity is the fastest, and droplets in the spray peripherally have low velocity components with various directions. Fuel droplets in spray axis are disturbed by the interaction of vortex exists in spray peripherally, then this effect cause heterogeneity of fuel spray stricture, After wall impingement, fuel droplet was dispersed by turbulence effect. And dispersion of fuel droplet with high turbulence promotes fuel vapor formation.
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