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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。
The detailed chemical reaction mechanism of gasoline-air mixture during light-off process was discussed, and a unified simulation model based on chemical kinetics and thermodynamics was established. Based on this model, The mixture was heated by the hot wall and the ignition process, using PISO algorithm for numerical simulation; numerical simulation results with the author’s experimental results agree well; at the same time, according to the calculation results, The changing rules of the characteristic parameters are analyzed. The results show that the unified model can comprehensively consider the detailed chemical reactions, boundary conditions, heat and mass transfer, and can solve the problem of numerical simulation of the detonation process of oil-gas thermal detonation. The hot- Namely, the slow oxidation stage, the rapid oxidation stage, the ignition stage, the flameout stage and the extinguished stage; the rapid oxidation stage and the slow oxidation stage are separated by the ignition point of gasoline; the ignition temperature of the gasoline is much higher than the auto ignition point of gasoline; The characteristics and effects of different stages in a chemical reaction are not the same.