采用标量概率密度函数(PDF)方法、稳态和非稳态火焰面模型三种方法对一个值班湍流CH4/O2/N2射流扩散火焰(Sandia Flame D)进行数值计算,以比较不同燃烧模型的性能.PDF方法通过计算反应标量的PDF输运方程来得到标量分布,而火焰面模型只求解单标量混合物分数的PDF方程,组分和温度分布通过火焰面方程的求解或者火焰面数据库的插值得到.计算结果和实验数据对比表明PDF方法计算结果最好但计算量相当大,稳态火焰面模型则反之.综合而言,非稳态火焰面模型的预测结果相对稳态模型有了非常大的改进,而计算量仍然容易接受,非常适合工程应用.
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