热壁条件下油气热着火关键因素探究

Study on the Key Factor of Thermal Ignition of Gasoline-air Mixture under the Conditions of Hot Wall

设计了受限空间内高温热壁条件下的油气热着火的实验系统。基于系统的实验和分析，探究了受限空间环境温度、湿度、压力、热壁温度对油气热着火发生的影响。实验发现：油气热着火概率随着热壁温度和环境温度的升高、湿度的减小而增加；油气混合物在汽油自燃点附近开始快速化学反应，油气热着火的最低临界温度为783K；油气热着火存在三角形的着火压力半岛，且着火压力下限随热壁温度升高而降低，着火压力上限随温度升高而提高。

The thermal ignition experiment system of gasoline-air mixture in confined space under the conditions of hot wall is designed. Based on the systematical experiments and analysis, the effects of environment temperature, humidity, pressure and temperature on hot wall on thermal ignition of gasoline-air mixture have been explored. It has been found that ： the thermal ignition probability of gasoline-air mixture increases with the increase of temperature of hot wall and environment, and with the decrease of humidity ; gasoline-air mixture starts rapid chemical reaction at the temperature of gasoline spontaneous combustion, and the minimum thermal ignition temperature of gasoline-air mixture is 783 K ; There is a triangle pressure peninsula of thermal ignition of gasoline-air mixture. The minimum ignition pressure decreases with the increase of temperature on the hot wall, and the ignition pressure ceiling increases with increasing temperature.