Modeling of Soot Formation in Gas Burner Using Reduced Chemical Kinetics Coupled with CFD Code

查看全文 作　　者：ZHANG Yindi ZHOU Huaichun XIE Mingliang FANG Qingyan WEI [1]Yan

机构地区：[1]State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《Chinese Journal of Chemical Engineering》索引2010年第18卷第6期,共12页

基　　金：Supported by the National Natural Science Foundation of China(50806023 50721005 50806024); Program of Introducing Talents of Discipline to Universities of China(“111” Project B06019) 摘　　要：A computational study of soot formation in ethylene/air coflow jet diffusion flame at atmospheric pres-sure was conducted using a reduced mechanism and soot formation model. A 20-step mechanism was derived from the full mechanism using sensitivity analysis,reaction path analysis and quasi steady state(QSS) approximation. The model in premixed flame was validated and with computing savings in diffusion flame was applied by incor-porating into a CFD code. Simulations were performed to explore the effect of coflow air on flame structure and soot formation. Thermal radiation was calculated by a discrete-ordinates method,and soot formation was predicted by a simple two-equation soot model. Model results are in good agreement with those from experiment data and detailed mechanism at atmospheric conditions. The soot nucleation,growth,and oxidation by OH are all enhanced by decrease in coflow air velocity. The peak soot volume fraction region appears in the lower annular region be-tween the peak flame temperature and peak acetylene concentration locations,and the high soot oxidation rate due to the OH attack occurs in the middle annular region because of high temperature. 关键词：化学反应动力学 CFD软件气体燃烧器烟尘计算结果耦合建模模型预测

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Modeling of Soot Formation in Gas Burner Using Reduced Chemical Kinetics Coupled with CFD Code

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