The influence of low temperature chemistry (LTC) on the locus of steady solutions predicted by a ZND model with curvature losses and detailed kinetics was assessed using undiluted / CO${}_2$-diluted stoichiometric DME-O${}_2$ mixtures. Results show (i) the existence of an additional critical point at large velocity deficits when the LTC submechanism is included in the reaction model, and (ii) a shift in the criticality from small to large velocity deficits as CO${}_2$-dilution is increased. Detailed thermo-chemical analyses revealed the importance of LTC in enabling an increased resistance to losses at large velocity deficits. LTC results in a temperature increase of $\sim 200$ K at the beginning of the reaction zone that activates the intermediate and high temperature reactions, thereafter leading to the main heat release stage. Without a process that replenishes the OH radical pool at postshock temperatures below 1000 K the critical point at large velocity deficits ceases to exist.

低温化学 (LTC) 对具有曲率损失和详细动力学的 ZND 模型预测的稳态解轨迹的影响使用未稀释的 / CO 进行了评估${}_{\mathrm{2个}}$-稀释的化学计量 DME-O${}_{\mathrm{2个}}$混合物。结果显示 (i) 当 LTC 子机制包含在反应模型中时，在大速度缺陷下存在一个额外的临界点，以及 (ii) 临界点从小速度缺陷到大速度缺陷的转变，如 CO${}_{\mathrm{2个}}$-稀释增加。详细的热化学分析揭示了 LTC 在提高大速度缺陷下的损失抵抗力方面的重要性。LTC 导致温度升高$～200$ K 在激活中间和高温反应的反应区开始处，然后导致主要的放热阶段。如果没有在低于 1000 K 的震后温度下补充 OH 自由基库的过程，大速度赤字的临界点将不复存在。