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为克服现有工程中模拟污染物生成模型存在的缺陷,采用简化的联合概率密度函数(PDF)模型预报了甲烷燃烧过程,得到的温度场及反应物和产物浓度场与实验结果相符。在此基础上,采用Zeldovich机理及简化的联合PDF湍流反应模型预报了甲烷燃烧过程中热力型NO的生成,并与实验及Arrhenius模型的预报结果进行了比较。结果表明,简化的联合PDF模型给出的NO分布与实验结果相符,而Arrhenius模型的预报值则远低于实验值。说明简化的联合PDF模型能够综合考虑湍流和反应动力学两方面的影响,合理预报NO的生成过程。
In order to overcome the shortcomings of the existing model in simulating pollutant generation, a simplified PDF model was used to predict the methane combustion process. The obtained temperature field, reactant and product concentration field are consistent with the experimental results. On this basis, Zeldovich mechanism and simplified PDF turbulence model are used to predict the generation of thermodynamic NO during methane combustion, and compared with the experimental and Arrhenius model predictions. The results show that the NO distribution given by the simplified joint PDF model agrees well with the experimental results, while the predicted value of the Arrhenius model is far below the experimental value. It shows that the simplified joint PDF model can comprehensively consider the effects of turbulence and reaction kinetics and reasonably predict the formation of NO.