521 直噴式ディーゼル機関の混合気形成過程における燃料液滴挙動の解明

概要

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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 spray droplets behavior. The experimental results show that : Near the spray axis, droplets velocity is the fastest, and droplets in the spray peripheral have low velocity components with various directions. Fuel droplets in spray axis are disturbed by the interaction of vortex exists in spray peripheral, then this effect causes the heterogeneity of fuel spray structure. After wall impingement, fuel droplets are dispersed by the turbulence effect. And the dispersion of fuel droplets with high turbulence promotes fuel vapor formation.
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