A Single Droplet Burning Model for High Temperature Air Stationary Environment

The liquid fuel droplet, such as aviation kerosene droplet, which mixed with the hot air mixture could experience ignition/burning as well as evaporation at same time. However the droplet ignition law is lack of both experimental data and theoretical study. In this paper, firstly, the common kerosene, RP3 aviation kerosene and diesel droplet ignition temperature versus droplet initial diameter was measured in the stationary high temperature air environment from 855 K to 1085 K. The experimental results show that the initial ignition diameter of common kerosene, RP3 aviation kerosene and diesel droplet decreases along with the ambient temperature rises; at the same environmental temperature, the possible-ignition minimum initial droplet diameter of common kerosene is the biggest, the diesel possible-ignition minimum initial droplet diameter is the middle, and the aviation kerosene possible-ignition minimum initial droplet diameter is the smallest. Secondly, two new droplet ignition models under the high temperature air stationary environment were proposed based on the analysis of Frank-Kamenetskii, which coincide with the experimental data.