Mechanism of Methane Addition Affects the Ignition Process of n-heptane under Dual Fuel Engine-Like Conditions
Mechanism of Methane Addition Affects the Ignition Process of n-heptane under Dual Fuel Engine-Like Conditions
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类双燃料发动机条件下甲烷添加影响正庚烷点火过程的机理
DOI：
10.1007/s11630-020-1260-z
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发表时间：
2020-09
影响因子：
2.5
通讯作者：
H. Wei
中科院分区：
文献类型：
--
作者：
Z.K Liu;L. Zhou;W.H Zhao;J.Y Qi;H. Wei
为了节约能源和保护环境，天然气在内燃机上得到了广泛的应用，因此研究天然气/柴油混合气的着火特性具有重要意义。在这项工作中，微量甲烷添加对正庚烷/空气混合物的着火延迟的影响进行了数值研究，使用一个详细的正庚烷机制在船舶发动机的条件下。模拟基于具有封闭均相反应器的软件CHEMKIN-PRO 18.0进行。结果表明，甲烷的加入使正庚烷/空气混合物的着火延迟时间（ID）在整个初始温度范围内都有所延长，且负温度系数（NTC）区的ID增量明显大于高温区。灵敏度分析表明，甲烷的加入削弱了重要基元反应对正庚烷氧化的抑制和促进作用。但对促进效果的弱化影响较为突出。此外，与甲烷氧化有关的一些基元反应的抑制效果也得到了增强。因此，正庚烷/空气混合物的ID延长。反应生成速率（ROP）分析表明，甲烷加入后，NTC区关键自由基的生成速率和消耗速率均显著降低，而高温区的降低幅度可以忽略不计。该研究为甲烷/正庚烷混合燃料高温高压着火特性的研究奠定了理论基础。
for saving energy and protecting the environment, natural gas has been widely used in internal combustion engines, which makes the study on the ignition characteristics of natural gas/diesel mixtures important. In this work, the effects of trace methane addition on the ignition delay of n-heptane/air mixtures are numerically studied using a detailed n-heptane mechanism under marine engine-like conditions. The simulations are carried out based on the software CHEMKIN-PRO 18.0 with a closed homogeneous reactor. Results show that the prolonged ignition delay times (IDs) of n-heptane/air mixtures are observed over the whole initial temperature range after methane is added, and the increment of IDs in the negative temperature coefficient (NTC) region is significantly higher than that in high temperature region. The sensitivity analysis indicates that both inhibition and promotion effects of important elementary reactions on n-heptane oxidation are weakened because of methane addition. However, the weakening influence on the promoting effect is more prominent. In addition, the inhibition effect of some elementary reactions that are related to the methane oxidation is enhanced. Thus, the IDs of n-heptane/air mixture are prolonged. The analyses of reaction rate of production (ROP) show that the both the production and consumption rates of key radicals decrease significantly in NTC region after methane is added, but it is negligible in the high temperature region. The study can extend the theoretical basis of ignition characteristics of methane/n-heptane blends under elevated temperatures and pressures.
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DOI：
10.4271/2013-24-0112
发表时间：
2013-09
期刊：
--
影响因子：
--
作者：
S. Schlatter;B. Schneider;Y. Wright;K. Boulouchos
通讯作者：
S. Schlatter;B. Schneider;Y. Wright;K. Boulouchos
影响因子：
4.4
作者：
Kuiwen Zhang;C. Banyon;J. Bugler;H. Curran;Anne Rodriguez;O. Herbinet;F. Battin‐Leclerc;Christine B'Ch
通讯作者：
Kuiwen Zhang;C. Banyon;J. Bugler;H. Curran;Anne Rodriguez;O. Herbinet;F. Battin‐Leclerc;Christine B'Ch
基于CFD和简化化学动力学模型的喷油器喷雾角度对天然气（NG）-柴油双燃料发动机燃烧和排放特性的影响
影响因子：
11.2
作者：
JunShu
通讯作者：
JunShu
甲烷/空气环境下喷射正时对正庚烷喷雾火焰点火过程的影响
影响因子：
7.4
作者：
Wei Haiqiao;Zhao Wanhui;Qi Jiayue;Liu Zongkuan;Zhou Lei
通讯作者：
Zhou Lei
影响因子：
5.3
作者：
Cordiner, Stefano;Gambino, Michele;Scarcelli, Riccardo
通讯作者：
Scarcelli, Riccardo