中文摘要：

探讨了汽油-空气混合物受热起燃过程的详细化学反应机理,建立了基于化学动力学和热力学相结合的油汽热爆燃起燃过程统一的仿真模型;基于该模型,对在密闭坑道的油汽混合物受到热壁的加热作用而着火过程,采用PISO算法进行了数值模拟;数值模拟结果与笔者实验结果吻合较好;同时根据计算结果,对热壁条件下的油汽热爆燃的引燃过程和特征参数的变化规律进行了分析。研究结果表明,统一模型综合考虑了详细化学反应、边界条件、传热传质,能较好解决油汽热爆燃的起爆过程的数值模拟问题;热壁条件下油汽混合物引燃分为五个阶段,即：缓慢氧化阶段、快速氧化段、着火段、熄火段、熄灭段;快速氧化段和缓慢氧化段以汽油自燃点为分界;油汽的着火温度远高于汽油自燃点;各组分在化学反应中的不同阶段的特征和作用并不相同。

英文摘要：

The detailed chemical reaction mechanism of the gasoline-air mixture in the course of thermal ignition was discussed. Based on the chemical kinetics and thermodynamics, comprehensive model of gasoline-air thermal ignition process was established. According to this model, using PISO algorithm, the numerical simulation of gasoline-air mixture suffered heating by hot wall in confined space was done. The numerical simulation results and experimental result which authors measured are in good agreement. According to calculation results, thermal ignition process of gasoline-air mixture under the conditions of hot wall and the changes of characteristic parameters were discussed. The results show that the model which combines with detailed chemical reaction, complicated boundary conditions, heat and mass transfer, can be used to solve the problem of the thermal deflagration initiation of gasoline-air mixture. There are free phases of ignition process of gasoline-air mixture under the conditions of hot wall, namely： slow oxidation stage, rapid oxidation stage, fire stage, blaze stage, extinguished stage. Rapid and slow oxidation are divided by the gasoline ignite temperature; gasoline-air mixture ignition temperature is much higher than gasoline ignition temperature. The characteristics and role of species in different stages of the chemical reactions are not same.