In this study, the effects of ozone addition on the cool flame and NTC (negative temperature coefficient) regions of stoichiometric C₃H₈/O₂ mixtures are computationally studied through the explosion limit profiles. The results show that with minute quantities of ozone addition (the mole fraction of ozone is 0.1%), the cool flame area is enlarged to the low-temperature region. Further increases in the mole fraction of ozone gradually weaken the NTC behavior, and a monotonic explosion limit is eventually achieved. The sensitivity analysis of the main reactions involving ozone reveals that the explosion limit is mainly controlled by the ozone unimolecular decomposition reaction O₃ (+M) = O₂ + O (+M). However, as its reverse reaction is a third-body reaction, this reaction will lose its effect on the explosion limit in the high-pressure region. On the contrary, the reaction O₃ + HO₂ = OH + O₂ + O₂ has a significant effect on the explosion limit in the high-pressure and low-temperature region, as the concentration of HO₂ increases through the rapid third-body reaction H + O₂ + M = HO₂ + M.

中文翻译：

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臭氧添加对丙烷-氧气混合物的冷火焰和负温度系数区域的影响。

在这项研究中，通过爆炸极限曲线，通过计算研究了添加臭氧对化学计量比C ₃ H ₈ / O ₂混合物的冷火焰和NTC（负温度系数）区域的影响。结果表明，随着少量臭氧的加入（臭氧的摩尔分数为0.1％），冷火焰区域扩大到了低温区域。臭氧摩尔分数的进一步增加逐渐削弱NTC行为，最终达到单调爆炸极限。对涉及臭氧的主要反应的敏感性分析表明，爆炸极限主要受臭氧单分子分解反应O ₃（+ M）= O _{2的控制。}+ O（+ M）。但是，由于其逆反应是第三体反应，因此该反应将失去对高压区域爆炸极限的作用。相反，该反应Ò ₃ + HO ₂ = OH + O ₂ + O ₂对在高压和低温区域中的爆炸极限一个显著效果，因为HO的浓度_2个通过快速三阶增加身体反应H + O ₂ + M = HO ₂ +M。