In a multi-component fuel spray, two-phase region during the evaporation process of fuel droplets appears due to mutual physical effects of each component included in a multi-component fuel. Therefore the evaporation process of multi-component fuel is different from that of a single component fuel. The spatial distribution of fuel vapor concentration that dominates auto-ignition and initial combustion depends on the volatility and diffusivity of each component fuel contained in the multi-component fuel. The prediction of the spatial fuel-vapor distribution of each component is thus, necessary to clarify the evaporation process of multi-component fuel spray. A simplified computation model considering two-phase region during the evaporation process of fuel droplets with multi-component is proposed in present study. Evaporation process is calculated based on a simple two-phase region that is approximated by modified saturated liquid-vapor line, which was obtained by connecting the 50 distillation temperature for each component under several pressure fields, instead of precise estimation of two-phase region characteristics. In the present work temporal and spatial distribution of each fuel-vapor concentration were assessed by the model incorporated in KIV A-II code, and the computational results are discussed.
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