Study of ignition in a high compression ratio SI (spark ignition) methanol engine using LES (large eddy simulation) with detailed chemical kinetics
Study of ignition in a high compression ratio SI (spark ignition) methanol engine using LES (large eddy simulation) with detailed chemical kinetics
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DOI：
10.1016/j.energy.2013.07.048
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发表时间：
2013-09
期刊：
影响因子：
9
通讯作者：
Xudong Zhen;Yang Wang
中科院分区：
文献类型：
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作者：
Xudong Zhen;Yang Wang
近年来，为了满足环境和经济方面的考虑，甲醇已被用作内燃机的替代燃料。本文采用大涡模拟（LES）方法对高压缩比火花点火甲醇发动机的点火过程进行了详细的化学动力学研究。采用21种84反应的甲醇机理模拟甲醇/空气混合气的自燃过程。最小点火温度（MIT）和最小点火能量（MIE）是设计安全标准和理解可燃混合物着火过程的两个重要性质。考察了火焰核尺寸、火焰核温度和等效比对MIT、MIE和IDP（点火延迟期）的影响。通过实验验证了甲醇反应机理。模拟结果表明，火焰核尺寸、温度和能量对甲醇/空气混合物的MIT、MIE和IDP有显著影响，点火延迟期的数值不仅与火焰核能量有关，还与火焰核温度有关。
Methanol has been recently used as an alternative to conventional fuels for internal combustion engines in order to satisfy some environmental and economical concerns. In this paper, the ignition in a high compression ratio SI (spark ignition) methanol engine was studied by using LES (large eddy simulation) with detailed chemical kinetics. A 21-species, 84-reaction methanol mechanism was adopted to simulate the auto-ignition process of the methanol/air mixture. The MIT (minimum ignition temperature) and MIE (minimum ignition energy) are two important properties for designing safety standards and understanding the ignition process of combustible mixtures. The effects of the flame kernel size, flame kernel temperature and equivalence ratio were also examined on MIT, MIE and IDP (ignition delay period). The methanol mechanism was validated by experimental test. The simulated results showed that the flame kernel size, temperature and energy dramatically affected the values of the MIT, MIE and IDP for a methanol/air mixture, the value of the ignition delay period was not only related to the flame kernel energy, but also to the flame kernel temperature.