横流环境中射流的数值研究  

Numerical simulation for the flow field of vertical round turbulent jet entering the cross current

作　　者：张晓元[1] 李炜[1] 李长城[1] 

机构地区：[1]武汉大学水利水电学院,湖北武汉430072

出　　处：《水利学报》2002年第3期32-38,43,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目 (5 99790 2 2 )

摘　　要：本文采用标准的k ε模型及混合有限分析法对均匀横流环境中的铅直圆形射流进行了 (射流比 0 5～ 8)数值分析 .所得射流轨迹线与实验资料吻合良好 ,且与理论分析得出了各种射流比 (射流出流速度与横流速度之比 )情况下的射流轨迹线、对称面上的内外边界线的统一数学表达式 ,得出了水平面上示踪质影响的最大宽度、射流横断面浓度最大值偏离射流中心值与射流比的关系式 ,还得出了射流是否发生附壁及产生分叉现象的界限值 .文中数值结果清晰地显示射流背流面存在马蹄形的流动结构 .The standard κ-ε model and hybrid finite analytic method(HFAM) are applied to numerically analyze the flow field of the vertical turbulent round jet entering the uniform cross free stream. The calculated trace of the jet is in good agreement with experimental data and theoretical analysis. The universal mathematical expressions of the jet trace and its boundaries for various jet flow ratio(the ratio of jet emitting velocity to cross flow velocity) are deduced. Furthermore, the dependence between maximum width of effective region of tracer with jet flow ratio, the relationship between deflection of maximum concentration point from jet center and jet flow ratio in different elevation are deduced. The conditions for occurrence of the jet stick to the wall and probability of jet bifurcation are also investigated.

关 键 词：圆形射流 数值模拟 横流环境 

分 类 号：O358[理学—流体力学]