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中文核心期刊

碳氢燃料点火燃烧的简化化学反应动力学模型

Development of reduced chemical reaction kinetic model for hydro-carbon fuel combustion

  • 摘要: 基于``准稳态''方法建立了一套复杂化学反应动力学模型简化方法和相应的软件SPARCK.并以3种典型的碳氢燃料------甲烷、乙烯和庚烷为研究对象,从甲烷点火燃烧的GRI2.11详细基元反应动力学模型出发简化得出了包含14个组分10步总包反应形式的简化化学反应动力学模型,从乙烯燃烧的51组分365详细基元反应模型出发简化得出了包含20个组分16步总包反应形式的简化化学反应动力学模型,从庚烷点火燃烧的160组分1540详细基元反应模型出发简化得出了包含26个组分22步总包反应形式的简化化学反应动力学模型. 通过对典型激波管试验的结果对比可以看出:得到的简化反应动力学模型能较为有效地再现详细基元反应模型的反应机理,具有较高的计算精度. 在工程计算中有较好的应用前景.

     

    Abstract: A method based on quasi-steady state approximation (QSSA) isused to construct a reduced chemical kinetic model for the ignitionand combustion of Hydro-carbon fuel, and a software package named SPARCK(Software Package for Reduction of Chemical Kinetics) is developed.Firstly, this method and software is applied to reduce the detailedelementary chemical kinetic model GRI2.11 for the combustion of methane,and a reduced global reaction kinetic model containing 14 species and 10 globalreactions is obtained. Secondly, when this method and software is applied tothe detailed elementary chemical kinetic model of ethylene combustion whichcontaining 51 species and 365 elementary reactions, a reduced globalreaction kinetic model involving 20 species and 16 global reactions canbe obtained. Finally, for the combustion of heptane, a reduced global reactionkinetic model involving 26 species and 22 global reactions is obtained from adetailed mechanism having 160 species and 1540 elementary reactions by thismethod. After using these reduced kinetic models to numerically simulate thetypical fuel ignition process in the shock tube, it can be seen that thesereduced models can represent the ignition mechanism of the detailed kineticmodels quite well and with good accuracies.

     

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