| Abstract:By mixing the n-butanol and diesel in a certain proportion into several blend fuels, the evaporation and atomization characteristics of the fuel, such as kinematic viscosity, distillation, density, closed-cup flash point, cetane number and heating value were measured, and the atomized droplet diameter, spray penetration distance, turbulent kinetic energy and dissipation rate of the fuel jet in the engine combustion chamber were analyzed based on the experimental date and three dimensional numerical simulation. The correlation between the evaporation-atomization characteristics was also analyzed. The results show that for the distillation characteristics, the distillation of 10% shows a significant advance with the increase of blend ratio, and the distillation of 95% has little difference. The density and heating value present a linear decline trend with blend ratio, and the kinematic viscosity, closed-cup flash point and cetane number decrease significantly at low blend ratio, but with the increase of blend ratio the downward trend begin to moderate. For the atomization characteristics, the atomized droplet diameter and turbulent kinetic energy show a downward trend with the increase of blend ratio while the average dissipation rate and high-speed expansion area of the fuel jet then increase. The kinematic viscosity, density and distillation of 50% are the main parameters affecting the atomization characteristics. The atomized droplet diameter is affected greatly by the fuel characteristics while the effect of closed-cup flash point, cetane number and heating value on atomization is relatively small. |