主支管动量比对T型管道流体混合过程影响  

Influence of momentum ratio of main duct to brach duct on fluids mixing in T-junction

作　　者：卢涛[1] 刘素梅[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《热科学与技术》2012年第1期13-19,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(50906002)

摘　　要：采用大涡模拟(large-eddy simulation,LES)的方法对T型管道内主管与支管不同动量比的流体混合过程的流动情况进行了数值模拟,采用时均值和均方根值来描述速度的平均大小和波动强度。通过改变主管和支管的速度比即动量比,将流体分为三类:碰撞射流、偏射流和壁面射流,研究其对速度的平均值和波动的影响,并研究其所反映的惯性力对流动的影响。该研究揭示了流体混合过程中动量比对波动的影响规律,对预测和校核管壁疲劳失效具有重要的指导意义。Numerical simulations were carried out for fluids with different velocity mixing in a T-junction by Large-Eddy Simulation(LES).The normalized mean and root-mean square velocity are used to describe the time-averaged velocities and velocity fluctuation intensities.Depending on the momentum/velocity ratio of the entering flows,the turbulent mixing patterns can be further divided into ″wall jet″,″deflecting jet″,and ″impinging jet″,and know it′s signification on the fluid flow.The influences of Reynolds number on the fluid flow were analyzed.The present research reveals the fluid flow of the fluids mixing.The obtained fluctuation intensity have great significance for the estimation and verification of the fatigue.

关 键 词：T型管道 动量比 大涡模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]