高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1871.doi: 10.7503/cjcu20200846

• 物理化学 • 上一篇    下一篇

燃烧反应机理构建的极小反应网络方法: C1燃料燃烧

李宜蔚, 申屠江涛, 王静波, 李象远()   

  1. 四川大学化工学院, 空天动力燃烧与冷却教育部工程研究中心, 成都 610065
  • 收稿日期:2020-12-07 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 李象远 E-mail:xyli@scu.edu.cn
  • 基金资助:
    国家自然科学基金(91741201)

Combustion Mechanism Construction Based on Minimized Reaction Network: C1⁃Oxygen Combustion

LI Yiwei, SHENTU Jiangtao, WANG Jingbo, LI Xiangyuan()   

  1. Engineering Research Center of Combustion and Cooling for Aerospace Power,Ministry of Education,College of Chemical Engineering,Sichuan University,Chengdu 610065,China
  • Received:2020-12-07 Online:2021-06-10 Published:2021-06-08
  • Contact: LI Xiangyuan E-mail:xyli@scu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(91741201)

摘要:

使用极小反应网络方法, 在指定中间物种条件下, 构建反应步数最小的详细燃烧反应机理. 确定了关 于C1燃烧机理的17个物种和14个独立反应, 其中包含氢气燃烧的8个物种6个反应, 对缺乏动力学参数的独立反应进行组合替代, 反应速率常数采用Arrhenius双参数形式. 采用构建的25步反应C1多燃料燃烧机理(MRN-C1)进行了点火延迟时间和层流火焰速度的模拟. 考虑到工程应用对机理组分数的限制, 以CH4和CH3OH单组分燃料为例, 考察了去除“滞留”物种后单组分机理与总机理的模拟结果差别.

关键词: 燃烧反应机理, 化学平衡, 反应网络, 机理抽取

Abstract:

With the development of the combustion mechanism, the reaction networks become more and more detailed, resulting in a larger mechanism size. The too large size of the reaction mechanism will make the combustion numerical simulation difficult in practice. In this work, the minimal reaction network (MRN) method proposed in previous work is used to develop the C1 combustion reaction mechanism with the minimum number of reaction steps and specified number of species. In the C1 combustion process, 14 independent reactions were determined for a system of 17 species, including 8 species and 6 independent reactions of hydrogen combustion. However, some global reactions need to be replaced by other elementary reaction steps owing to the lack of the rate constants. In this way, a 25-step detailed mechanism of C1 combustion(MRN-C1) was constructed. The reliability of MRN-C1 mechanism was verified by ignition delay time and laminar flame speed. When applying the multi-fuel mechanism to a single fuel, e.g. CH4, there exists a few suspended species that have no other consumption path after they are produced. Therefore, mechanism-extracting of MRN-C1 aimed at the single fuel combustion was performed. Such a treatment can further reduce the size of the mechanism for a specified fuel, it saves the cost in large-scale-computation of combustion.

Key words: Combustion reaction mechanism, Chemical equilibrium, Reaction network, Mechanism-extrac-ting

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