典型航空煤油的模型燃料及其骨架反应机理构建

Development of Surrogate Fuels and Skeletal Reaction Mechanism for Several Typical Aviation Kerosene Fuels

关键词:  航空煤油  模型燃料  化学反应机理  骨架机理  燃烧

Key words:  Aviation kerosene  Surrogate fuel  Chemical reaction mechanism  Skeleton mechanism  Combustion

摘要:

针对航空煤油低温简化机理极其缺乏的问题，选取正十二烷、2，5-二甲基己烷和甲苯作为基础燃料，分别为S-8，Jet-A和RP-3航空煤油构建模型燃料，并利用官能团匹配方法确定基础燃料配比。针对传统解耦法采用C₀-C₃机理造成精度不高的问题，采用C₀-C₄机理耦合基础组分C_n-C₅骨架子机理，然后利用实验数据优化C_n-C₅骨架子机理的反应速率常数。通过机理简化方法，得到包含122个组分，725个反应的骨架机理，并对各组分机理进行了验证。最后，对构建航空煤油模型燃料的着火延迟时间、组分浓度演变数据和层流火焰速度进行了验证，结果表明所构建模型具有简洁和精准的优点，为高精度的燃烧反应流数值模拟研究奠定了基础。

Abstract:

In order to solve the problem of lack of reduced mechanism for aviation kerosene at low temperature condition， n-dodecane， 2，5 dimethylhexane and toluene were selected and formulated by directly matching functional groups for S-8， Jet-A and RP-3 surrogate fuels. In order to improve the precision of the decoupling methodology that using a reduced C₀-C₃ mechanism， a new methodology that constructed skeletal mechanism by integrating a detailed C₀-C₄ mechanism and C_n-C₅ component skeletal mechanisms was proposed. And then， the rate constant of C_n-C₅ reactions were optimized based on experimental data. Finally， the surrogate skeletal mechanism which contains 122 species and 725 elementary reactions was obtained by using mechanism reduction scheme. After that， the skeletal mechanism was verified against various experiments for each individual surrogate component. Furthermore， the performances of present surrogate model were validated by ignition delay times， species concentrations and laminar flame speeds. The present surrogate models have the advantages of simplicity and accuracy， which lay the foundation for high-precision combustion simulation.