Ping Yi

Development of an Improved Multi-Component Vaporization Model for Application in Oxygen-Enriched and EGR Conditions

An improved multi-component vaporization model was developed and applied to predict the vaporization characteristics of a fuel droplet under oxygen-enriched and exhaust gas recirculation (EGR) conditions in this study. The model was constructed including an improved enthalpy diffusion sub-model, a corrected Stefan flow velocity, and temporal variation of thermal physical properties. The computational results were validated with the experimental data and satisfactory agreements between the predictions and measurements can be achieved. The effects of O2, CO2 concentration, and EGR on the vaporization rate of fuel droplet in various ambient temperature and pressure conditions were investigated.

Evaporation of pure and blended droplets of diesel and alcohols (C2–C9) under diesel engine conditions

ABSTRACT An improved multicomponent evaporation model was developed to study the evaporation characteristics of the pure diesel and alcohol (C2–C9) as well as their blended droplets. In this model, the Predictive Soave–Redlich–Kwong (PSRK) equation of state (EOS) was employed to evaluate the vapor–liquid equilibrium for pure and blended droplets. The results indicated that the model predictions agree very well with the experimental measurements. The evaporation characteristics of different pure alcohol droplets were analyzed, and the influence of the addition of alcohols in diesel on the evaporation behavior of droplets under various conditions was discussed.