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化工学报  2014 

湍流非预混燃烧数值模拟的代数二阶矩模型

DOI: 10.3969/j.issn.0438-1157.2014.02.007, PP. 415-421

Keywords: 湍流,非预混燃烧,数值模拟,混合速率,模型

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Abstract:

湍流燃烧数值模拟是研究燃烧的一种重要手段,采用的湍流燃烧模型是否恰当直接影响最终结果的准确性。在湍流燃烧中,化学反应速率不仅取决于当地的组分浓度和温度,而且与组分的湍流脉动也有密切关系。通过对湍流燃烧模型进行探讨,发现代数二阶矩模型(ASOM)能综合考虑湍流和反应动力学因素的影响,而且比其他复杂的模型简单。研究将组分混合速率对化学反应速率的影响在一个修正的代数二阶矩模型(RASOM)中进行考虑,更准确地计算出化学反应速率。为了验证模型的准确性,RASOM模型被应用到Sandia实验室测量的甲烷-空气非预混燃烧(Flame-D)的数值模拟中。模拟得到的结果与实验结果以及修正的涡破碎模型(EBU-A)和原ASOM模型的结果进行了对比,发现RASOM模型的效果较好。

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