氢气扩散火焰中辐射源项湍流脉动特征的PDF模拟  

PDF Simulation of Fluctuating Behavior of Radiative Source Term in Hydrogent Turbulent Jet Diffusion Flame

作　　者：徐晓[1] 刘林华[1] 陈义良[2] 王海峰[2] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]中国科学技术大学热科学系,安徽合肥230026

出　　处：《计算物理》2004年第3期346-350,共5页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(50176011)资助项目

摘　　要：　采用κ-ε湍流模型、标量联合的概率密度函数(PDF)输运方程和层流火焰面模型相结合,模拟氢气自由扩散火焰中辐射源项湍流脉动特征.给出了主燃区内辐射源项湍流脉动的频率图.辐射源项的样本点分布集中,大约95%以上的样本落在其系综的±3倍方差以内,频谱图为单峰.The laminar flamelet model in combination with joint probability density function (PDF) transport equation of mixture fraction and turbulence frequency is used to simulate fluctuating behavior of radiative source term in turbulent jet diffusion flames of hydrogen.The frequency distributions of radiative source terms in the combustion zone are calculated. The results show that, for the given ensemble, about 95% samples of radiative source term locate within the region of ±3^0 standard deviation of the mean radiative source term. The profile of frequency distribution indicates having a single peak.

关 键 词：层流火焰面模型 概率密度函数 辐射源项 湍流扩散火焰 传热学 

分 类 号：TK124[动力工程及工程热物理—工程热物理]