基于组分半全局敏感性的燃烧反应动力学模型简化方法

In view of the lack of diagnostic methods for evaluating the importance of species in kinetic combustion mechanisms，a species-targeted semi-global sensitivity analysis method is proposed to evaluate the importance of species and simplify chemical models. The proposed method is used to reduce the USCMechII and JetSurF mechanisms and Wang’s model for dimethyl ether(DME)，so that the reduced mechanisms can accurately predict the ignition delay time of ethylene，n-heptane and DME，respectively. The species-targeted semi-global sensitivity method can not only evaluate the importance of species but also reveal the positive and negative contributions of species to combustion properties. With unimportant species eliminated by this method，USCMechII for ethylene oxidation，JetSurF for n-heptane oxidation and Wang’s model for DME oxidation are reduced to skeletal mechanisms consisting of 32，56 and 32 species，respectively. And these reduced mechanisms are more compact than those obtained by the directed relation graph(DRG)method and the directed relation graph with error propagation(DRGEP)method.