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为了研究混合分数概率密度函数对湍流扩散燃烧的影响,采用稳态火焰面模型描述超声速扩散燃烧过程,分别采用β-PDF和δ-PDF方法对层流火焰面数据库积分得到两种湍流火焰面数据库,并对比分析了湍流火焰面数据库。结合混合RANS/LES程序,利用DLR氢燃料超燃燃烧室算例进一步对比验证采用不同PDF方法生成的湍流火焰面数据库。研究结果表明,混合分数β分布数据库中间组分随混合分数方差变化大,采用混合分数β分布的算例计算结果脉动速度较大,与实验结果符合得更好。
In order to study the effect of mixed fractional probability density function on turbulent diffusion combustion, steady state flame surface model was used to describe the process of supersonic diffusion combustion. Two types of turbulent flame surface database were obtained by integrating β-PDF and δ-PDF method respectively. , And compared the turbulent flame surface database. Combining with the hybrid RANS / LES program, a DLR hydrogen fuel combustion combustor was used to further validate the turbulent flame surface database generated by different PDF methods. The results show that the middle component of the mixed fraction β distribution database varies greatly with the variance of the mixture fraction, and the calculation result of the mixture fraction β distribution has a higher pulsation velocity, which is in good agreement with the experimental results.