Effect of Supercritical Ambient Conditions on Hydrocarbon Fuel Droplet Evaporation Characteristics

Evaporation process of n-nonane droplet in nitrogen was numerically calculated via the developed calculation program. The effects of ambient pressure,ambient temperature and initial droplet temperature on the vaporization characteristics were investigated. Results show that,with the increase of ambient pressure,rising of droplet surface temperature is rapid,expansion of droplet in the beginning period is remarkable,and transition time is advanced. With the increase of ambient temperature, vaporization lifetime is decreased,transition time is advanced,and expansion of droplet in the beginning period is unobvious. When initial droplet temperature is increased,vaporization lifetime is decreased and transition time is advanced. The difference in initial droplet temperature will advance or retard the evaporation process.