期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 46, 期 6, 页码 7861-7871出版社
WILEY-HINDAWI
DOI: 10.1002/er.7685
关键词
CH3OH; chemical kinetics; NO2; shock tube
资金
- Key Technologies R&D Program of Henan Province [192102310238]
- National Natural Science Foundation of China [51906061]
NO2 was found to promote the ignition characteristics of methanol fuel by increasing the generation of OH radicals and rapid accumulation in the early ignition stage, which interfered with the reaction system and advanced the ignition of methanol.
Based on the shock tube experiments, the influence of NO2 on the ignition characteristics of methanol fuel was systematically studied. The ignition delay time of the CH3OH/NO2/O-2/Ar mixture with equivalence ratios of 0.5, 1, and 1.5 was measured at the reflected shock temperatures of 1100 similar to 1650 K and the reflected shock pressure of 0.20 MPa. The methanol-NO2 mechanism was newly constructed based on previously developed mechanisms for methanol and NO2 reaction pathways. The new combined reduced mechanism could well predict the ignition delay time of the CH3OH/NO2/O-2/Ar mixture. Based on the newly constructed methanol-NO2 mechanism, the reaction path, sensitivity, and important elementary reactions of the stoichiometric mixture were analyzed, and the reasons why NO2 promoted the ignition of methanol fuel were found out: the increase of OH radicals generation and rapid accumulation in the early ignition stage enhanced the activity of the reaction system, interfered the ignition process of CH3OH/NO2/O-2/Ar mixture in advance, and promoted the ignition of methanol fuel.
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