The effect of supercritical ambient conditions on hydrocarbon fuel droplet combustion characteristics

The effects of ambient pressure, ambient temperature and initial droplet temperature on the droplet combustion characteristics were investigated via the developed droplet combustion model. The results show that, the droplet combustion lifetime is the shortest at the critical pressure of the fuel. With the increase of the ambient pressure, ignition delay gradually shortened, the flame radius is gradually reduced, and the rising speed of flame temperature in the fast-rising period gradually slows down; With the ambient temperature increases, droplet combustion lifetime and ignition delay is gradually shorten, the flame radius increases; with the initial droplet temperature increases, both droplets combustion lifetime and ignition delay almost linearly reduces, the initial droplet temperature impacts on the advance and delay of the whole droplet combustion process.