Low to intermediate temperature oxidation studies of dimethoxymethane/n-heptane blends in a jet stirred reactor (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Low to intermediate temperature oxidation studies of dimethoxymethane/n-heptane blends in a jet stirred reactor (PDF)
- 发表刊物：
- Combust Flame
- 摘要：
- Kinetic research concerning fuel blends of ethers or dithers and larger alkanes at low temperatures is extremely scarce. In this work, a study of the oxidation of dimethoxymethane (DMM)/n-heptane fuel blends (neat n-heptane, 25/75, 50/50, neat DMM) was performed using an atmospheric pressure jet-stirred reactor over the temperature range of 500–1100 K, at a residence time of 2.0 s, at three equivalence ratios (0.5, 1.0, and 2.0), and at a constant fuel inlet mole fraction of 0.005 (with high dilution in argon). The reliability of the newly built JSR setup was validated against literature data. A chemical kinetic model capable of describing the low temperature chemistry of the fuel blends was constructed. The effect of using AramcoMech 1.3 and AramcoMech 2.0, respectively, as the base-mechanism has been tested and some important reactions such as Ḣ +O2 (+M) <=> HȮ2 (+M), have been found to be responsible for their different performances. Not unexpectedly, the reactivity of DMM is remarkably enhanced in the fuel blends and correspondingly, that of n-heptane is inhibited. To quantify the degree to which the reactivity of n-heptane is inhibited, an inhibiting coefficient was introduced. It is interesting that the correlation between the inhibiting intensity and equivalence ratio is non-monotonic. Rate of production analysis was conducted to investigate the chemical interaction effect on their respective decomposition pathways at lower temperatures. Kinetic analysis combined with the experimental observations indicate that the rate coefficients for H-abstraction reactions by ȮH from DMM were overestimated. Possible modifications to the reaction rate of this reaction type were suggested, leading to a better prediction. Three intermediate representatives were discussed in detail to elucidate the chemical interactions between the two fuel components.
- 合写作者：
- Gao ZH, Hu EJ, Xu SH, Huang ZH
- 卷号：
- 2019, 207: 20-35
- 页面范围：
- 20-35
- 是否译文：
- 否
- 发表时间：
- 2019-09-10
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