Abstract From a usability and capability perspective, dimethyl ether (DME) fuel with nitrous oxide (N 2 O) as oxidant is a promising combination for next-generation combustion devices or propellants for space vehicles. However, to ensure proper and profitable application of this fuel, we must clarify the combustion characteristics of the DME–N 2 O mixture. To this end, we conducted burning velocity experiments using the closed spherical bomb technique initiated at 0.1 MPa and 295 K and ran numerical models considering the DME oxidation and N 2 O decomposition reaction mechanisms in the DME–N 2 O mixtures. To characterize the N 2 O oxidant, we compared the experimental and theoretical results of DME–N 2 O with those of air and N 2 /0.5O 2 gases as oxidants. Among the three mixtures (containing the same amount of DME 6.54% by volumetric fraction), DME–N 2 O exhibited the lowest burning velocity, although N 2 O has large heat of formation. The experimental burning velocity of DME–N 2 O was slowed by the low thermal diffusivity and the delay caused by the decomposition reactions of N 2 O, N 2 O (+M) ↔ N 2 + O (+M), N 2 O + H ↔ N 2 + OH, and N 2 O + H ↔ NH + NO, which are same as those that are considered important in the oxidation of C1–C3 hydrocarbon–N 2 O mixtures.

中文翻译：

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二甲醚 (DME)-一氧化二氮 (N 2 O) 混合物的燃烧速度

摘要 从可用性和性能的角度来看，以一氧化二氮 (N 2 O) 为氧化剂的二甲醚 (DME) 燃料是下一代燃烧装置或航天器推进剂的有前途的组合。然而，为了确保这种燃料的正确和有利可图的应用，我们必须阐明 DME-N 2 O 混合物的燃烧特性。为此，我们使用封闭球弹技术在 0.1 MPa 和 295 K 下进行了燃烧速度实验，并运行了考虑 DME-N 2 O 混合物中 DME 氧化和 N 2 O 分解反应机制的数值模型。为了表征 N 2 O 氧化剂，我们将 DME-N 2 O 与空气和 N 2 /0.5O 2 气体作为氧化剂的实验和理论结果进行了比较。在三种混合物中（按体积分数含有相同数量的 DME 6.54%），DME-N 2 O 表现出最低的燃烧速度，尽管 N 2 O 具有很大的形成热。DME–N 2 O 的实验燃烧速度因低热扩散率和 N 2 O、N 2 O (+M) ↔ N 2 + O (+M)、N 2 O 的分解反应引起的延迟而减慢+ H ↔ N 2 + OH 和 N 2 O + H ↔ NH + NO，它们与在 C1-C3 烃-N 2 O 混合物的氧化中被认为重要的那些相同。