N_(2)O—C_(2)烃类燃料推进剂燃烧化学反应机理与动力学分析  

Chemical reaction mechanism and kinetic analysis of N_(2)O-C_(2)hydrocarbons propellant

作　　者：段志强 郑东 周斌[1] DUAN Zhiqiang;ZHENG Dong;ZHOU Bin(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学机械学院,四川成都610031

出　　处：《火箭推进》2021年第3期43-51,共9页Journal of Rocket Propulsion

基　　金：国家自然科学基金(51606212)。

摘　　要：以验证充分、应用广泛的小碳氢燃料反应机理为基础,通过耦合N_(2)O子机理,对比多种N_(2)O—C_(2)烃类燃料燃烧化学反应动力学模型。进一步的验证结果表明,USC-Konnov模型能更为准确地用来测算N_(2)O—C_(2)体系着火延迟时间,以及N_(2)O—C_(2)H_(2)烃类燃料体系层流火焰的传播速度。对比不同模型预测结果发现:对N_(2)O—C_(2)烃类燃料的着火延迟时间而言,C_(2)机理影响较小,而N_(2)O子机理影响显著。对其层流火焰传播速度而言,C_(2)机理仅在富燃时有一定影响,而N_(2)O子机理在整个化学计量比范围内均有较大影响。进而通过灵敏度分析从化学反应动力学的角度给出了合理解释,确定了对N_(2)O—C_(2)烃类燃料着火延迟时间、火焰传播速度影响较大的基元反应。其中,基元反应N_(2)O+M=N_(2)+O+M和N_(2)O+H=N_(2)+OH对N_(2)O—C_(2)烃类燃料体系的着火、燃烧过程起着决定性作用。Based on the fully validated and widely used chemical reaction mechanism of small hydrocarbons,the chemical kinetic models of various N_(2)O—C_(2)hydrocarbons are compared by coupling with N_(2)O sub-mechanisms.Further validation results show that the USC-Konnov model can be used to calculate the ignition delay time of N_(2)O—C_(2)hydrocarbons and laminar flame velocity of N_(2)O—C_(2)H_(2)more accurately.For N_(2)O—C_(2)hydrocarbons ignition delay time,the comparison of different model predictions indicates that C_(2)mechanism has little effect while N_(2)O sub-mechanism has significant effect.As for the propagation velocity of laminar flame,C_(2)mechanism has a certain effect only under the fuel-rich condition,while N_(2)O sub-mechanism has important effect under the whole equivalent ratio range.Moreover,a reasonable explanation is presented through the sensitivity analysis from the point of view of chemical kinetics,and the elementary reactions that have a greater impact on the ignition delay time and laminar flame velocity of N_(2)O—C_(2)hydrocarbons are determined.Among them,the elementary reactions of N_(2)O+M=N_(2)+O+M and N_(2)O+H=N_(2)+OH dominate the processes of N_(2)O—C_(2)hydrocarbons ignition and combustion.

关 键 词：氧化亚氮 小碳氢燃料 化学反应机理 灵敏度分析 绿色推进剂 

分 类 号：V312[航空宇航科学与技术—航空宇航推进理论与工程]