Evaluationof Presumed Probability-Density-Function Models in Non-Premixed Flames by using Large Eddy Simulation  

作　　者：CAO Hong-Jun ZHANG Hui-Qiang LIN Wen-Yi 曹红军;张会强;林文漪(Department of Engineering Mechanics,Tsinghua University,Beijing 100084)

机构地区：[1]Department of Engineering Mechanics,Tsinghua University,Beijing 100084

出　　处：《Chinese Physics Letters》2012年第5期173-176,共4页中国物理快报（英文版）

摘　　要：Four kinds of presumed probability-density-function (PDF) models for non-premixed turbulent combustion are evaluated in flames with various stoichiometric mixture fractions by using large eddy simulation (LES).The LES code is validated by the experimental data of a classical turbulent jet flame (Sandia flame D).The mean and rms temperatures obtained by the presumed PDF models are compared with the LES results.The β-function model achieves a good prediction for different flames.The predicted rms temperature by using the double-δ function model is very small and unphysical in the vicinity of the maximum mean temperature.The clip-Gaussian model and the multi-δ function model make a worse prediction of the extremely fuel-rich or fuel-lean side due to the clip at the boundary of the mixture fraction space.The results also show that the overall prediction performance of presumed PDF models is better at mediate stoichiometric mixture fractions than that at very small or very large ones.

关 键 词：prediction MIXED TURBULENT 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]