飞机防火试验中的燃烧反应动力学模型研究

使用反应路径分析法对Jet-A型航空煤油燃烧的气相燃烧机理进行简化。选用POSF-4658机理作为Jet-A燃烧的详细反应机理,该机理包含1607种燃烧组分、6633个基元反应机理。将飞机防火试验条件作为简化过程的初始条件,得到78种组分,196个反应机理的Jet-A燃烧机理。通过对Jet-A的简化反应机理、详细反应机理和JetA实验数据的比较可以发现,简化反应机理可以较准确地反映Jet-A型航空煤油在防火试验条件下的燃烧特性。利用常用的Jet-A型航空煤油简化机理计算的绝热火焰温度、点火延迟时间及层流火焰速度与本文提出的简化的计算值进行比较。结果表明,提出的简化机理在防火试验条件下具有较高的精确度。得到的Jet-A简化反应机理可为飞机防火试验的仿真研究提供燃烧场的化学反应动力学模型。

Reduction kinetic model of Jet-A combustion in aircraft fire testing

Based on the path flux analysis method, a detailed mechanism of POSF-4658 with 1607 species and 6633 reactions is used to describe the combustion of the Jet-A. A reduced mechanism (78 species and 196 elementary reactions) for Jet-A/air mixture combustion is generated by an initial condition consistent with the condition of aero-engine fire testing. Comparison between the reduced mechanism, detailed mechanism and experimental values shows that the reduced mechanism could maintain the reaction characteristics of Jet-A under the fire testing condition. The development of these models represents a significant step toward coupling of chemical reaction kinetics with computational fluid dynamics, and is a good chemical kinetic model of aero-engine fire testing for simulation study.