The homogeneous, isochoric and adiabatic autoignition of rich methanol mixtures is analysed using algorithmic tools of Computational Singular Perturbation. It is shown that ignition delay decreases as the equivalence ratio ϕ increases, due to the faster production of OH radicals via the reactions CH${}_3$OH + HO${}_2$ $\to$ CH${}_2$OH + H${}_2$O${}_2$ and H${}_2$O${}_2$ (+M) $\to$ OH + OH (+M). After ignition and for sufficiently rich mixtures the phenomenon of super-adiabatic temperature (SAT) is observed; i.e. the temperature after ignition decreases with time. This feature is accompanied by the appearance of an explosive mode. With increasing values of ϕ, SAT becomes more pronounced and the explosive mode becomes faster; i.e. its time scale is shortened. SAT is due to the fact that as ϕ increases the role of hydrogen chemistry diminishes and the explosive character of the process is basically generated by endothermic dissociation reactions of carbon-containing species that cause an increase in number of molecules and a temperature decrease.

使用计算奇异扰动的算法工具分析了富甲醇混合物的均质、等容和绝热自燃。结果表明，点火延迟随着当量比ϕ 的增加而减少，这是由于通过反应 CH 更快地产生 OH 自由基${}_3$哦 + 水${}_2$ $\to$ CH${}_2$哦+H${}_2$哦${}_2$ 和 H${}_2$哦${}_2$ (+M) $\to$哦 + 哦 (+M)。点燃后，对于足够浓的混合物，观察到超绝热温度 (SAT) 现象；即点燃后的温度随时间降低。此功能伴随着爆炸模式的出现。随着ϕ值的增加，SAT 变得更加明显，爆发模式变得更快；即它的时间尺度被缩短了。SAT 是因为随着φ 的增加，氢化学的作用减弱，该过程的爆炸性基本上是由含碳物质的吸热解离反应产生的，导致分子数量增加和温度降低。