酚醛树脂热解产物高温燃烧详细化学反应机理简化

针对流动/酚醛树脂热解产物燃烧耦合数值模拟过程中使用详细化学反应机理带来的数值刚性问题,以保证计算精度要求,对酚醛树脂热解产物详细化学反应动力学模型进行简化研究。选取Chemkin-Pro中的良搅拌反应模型,对由53种组分325个基元反应组成的甲烷掺氢气详细化学反应动力学机理进行了敏感性分析和生产速率分析,得到包含15种组分15个基元反应的简化机理。结果表明:简化化学动力学模型能充分地再现详细基元反应模型的反应机理的主要特征,大幅缩短计算时间,进而用于高超声速条件下酚醛树脂热解产物引射及其对边界层扰动的计算流体动力学(Computational fluid dynamics,CFD)中。

Reduction of Chemical Kinetic Mechanism for High-Temperature Pyrolysis Products of Phenolic Resin

In order to solve the numerical stiffness problem in the combustion of pyrolysis products of phenolic resin numerical simulation resulting from adopting the detailed chemical kinetic mechanism, the mechanism reduction were studied and acquired the optimal reduction with least accuracy loss. The perfect stirred reactor (PSR) model in Chemkin-Pro was chosen to study the detailed mechanisms of the mixture of methane and hydrogen consisting of 53 species and 325 elementary reactions with sensitivity analysis coupling with rate of production analysis. The mechanism was finally reduced to 15 species and 15 elementary reactions. The result showed that the reduced mechanism could sufficiently exhibit the characteristics of the detailed mechanisms and greatly reduced the computational cost and be used in the computational fluid dynamics (CFD) of the ejector perturbation of pyrolysis products of phenolic resin and the interactions with boundary layer.