奇异摄动法简化化学反应机理

本文简单介绍了奇异摄动方法简化化学反应机理的原理,通过对反应过程中不同反应模态的特征时间来区分反应过程中的快慢模态,并由此确定简化机理的组分数,对氢气/空气、甲烷/空气的燃烧机理分别用CSP方法做简化,对GRI-2.11的简化机理论与详细机理对点火延迟时间和火焰传播速度进行了较宽压力和当量比下的验证,结果证明了该方法的有效性和准确性。同时也讨论了不同反应快模态数的选择对结果会产生的影响,为得到能模拟点火过程的简化机理提供一种参考方法。

Computational Singular Perturbation for Simplified Chemical Kinetic Mechanisms

The method of computational singular perturbation for the reduction of complicated chemical mechanisms has been simply introduced in this paper.The fast reaction mode was defined by using the time scales of the independent modes.The number of species was depended on the fast mode.The present method was then employed to generate reduced mechanisms for H₂/air and CH₄/air oxidation,respectively.The reduced mechanism form GRI-2.11 show good agreement over a wide range of pressures and equivalence ratios on the ignition delay time and flame speed with GRI-2.11.The validity and efficiency of this algorithm is demonstrated.The effect of fast reaction mode selection on the simplified result was discussed in this paper and a reference method was suggested for generating simplified kinetic mode of ignition.