Large eddy simulation of hot and cold fluids mixing in a T-junction for predicting thermal fluctuations  

作　　者：朱维宇 卢涛 姜培学 郭志军 王奎升 

机构地区：[1]School of Mechanical and Electrical Engineering,Beijing University of Chemical Technology [2]Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Thermal Engineering,Tsinghua University

出　　处：《Applied Mathematics and Mechanics(English Edition)》2009年第11期1379-1392,共14页应用数学和力学（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50906002);Beijing Novel Program (No.2008B16)

摘　　要：Temperature fluctuations in a mixing T-junction have been simulated on the FLUENT platform using the large eddy simulation （LES） turbulent flow model and a sub-grid scale Smagorinsky-Lilly model. The normalized mean and root mean square temperatures for describing time-averaged temperature and temperature fluctuation intensity, and the velocity are obtained. The power spectrum densities of temperature fluctuations, which are key parameters for thermal fatigue analysis and lifetime evaluation, are analyzed. Simulation results are consistent with experimental data published in the literature, showing that the LES is reliable. Several mixing processes under different conditions are simulated in order to analyze the effects of varying Reynolds number and Richardson number on the mixing course and thermal fluctuations.Temperature fluctuations in a mixing T-junction have been simulated on the FLUENT platform using the large eddy simulation （LES） turbulent flow model and a sub-grid scale Smagorinsky-Lilly model. The normalized mean and root mean square temperatures for describing time-averaged temperature and temperature fluctuation intensity, and the velocity are obtained. The power spectrum densities of temperature fluctuations, which are key parameters for thermal fatigue analysis and lifetime evaluation, are analyzed. Simulation results are consistent with experimental data published in the literature, showing that the LES is reliable. Several mixing processes under different conditions are simulated in order to analyze the effects of varying Reynolds number and Richardson number on the mixing course and thermal fluctuations.

关 键 词：numerical simulation thermal fluctuation T-JUNCTION MIXING 

分 类 号：TK12[动力工程及工程热物理—工程热物理]