T型管道冷热流体混合过程中速度波动大涡模拟  

Large-eddy simulation of velocity fluctuation of hot and cold fluids mixing in a tee-junction

作　　者：朱维宇[1,2] 卢涛[1] 郭志军[1] 王奎升[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]中国石油辽阳石化公司,辽宁辽阳111003

出　　处：《大连理工大学学报》2010年第6期896-900,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(50906002);教育部高等学校博士学科点专项科研基金资助项目(20090010110006);北京市科技新星计划资助项目(2008B16)

摘　　要：T型管道中的冷热流体混合湍动效应,必将导致流体的速度波动,这是诱发管道热疲劳的流动本质原因.为了揭示这一原因,对T型管道中主管为热流体和支管为冷流体的混合过程进行了大涡模拟,对比分析了某一截面位置上的时均速度和均方根速度的实验值与模拟值.实验值与模拟值吻合良好,说明大涡模拟能够准确地预测混合过程的时均速度和速度波动.数值结果表明,x和z方向的时均速度和均方根速度沿z方向具有随着x/db的增大而趋于平稳、随y/db的增大而减小的总体趋势.The turbulence effect of hot and cold fluids mixing in the tee-junction led to fluctuations of velocity,which is the essential cause of fluid flow inducing thermal fatigue of pipe.In order to reveal the cause,fluids mixing for the case with hot fluid in main duct and cold fluid in branch duct of a teejunction was numerically simulated by large-eddy simulation.Numerical results of time-averaged and root-mean square velocities were compared with experimental results in a profile.The good agreement of numerical results with experimental ones indicates that large-eddy simulation can exactly predict the time-averaged velocity and velocity fluctuation of mixing process.Numerical results show that the profiles of time-averaged and root-mean square velocities in xand z directions along z direction have the trend of becoming uniform with the increase of x/dband decreasing with the increase of y/db.

关 键 词：T型管道 混合过程 速度波动 大涡模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]