Thermal ignition phenomena of gasoline-air mixture induced by hot wall

A special experiment system was designed to carry out an experimental investigation about gasoline-air mixture ignition phenomena induced by the hot wall in a confined space. According to experimental results, the ignition manner of gasoline-air mixture, the critical ignition temperature and the ignition pressure region and the change laws of concentration, temperature in the course of fire were discussed in detail. It is found that the ignition course of gasoline-air mixture in the confined space is divided into three phases, namely, gasoline steam pyrolysis, oxidation reaction, accelerated oxidation. There are three ignition manners of gasoline-air mixture caused by the hot wall, namely combustion, deflagration, and explosion. Gasoline-air mixture in the confined space starts its rapid chemical reaction at the spontaneous combustion temperature of gasoline. And its ignition temperature is about 80 K higher than spontaneous combustion point of gasoline. Regardless of region of the fire, or other region in the confined space, there is a sudden rise of temperature at the time of ignition. When the temperature of the hot wall reach 773～873 K, there is a triangle pressure peninsula of thermal ignition of gasoline-air mixture, where the ignition pressure region is of 2.2～17.6 kPa.