静止环境中平面负浮力排放近区特性的数值研究

Numerical study on the near-field behavior of plane negative buoyant jets under static environment

运用k ε湍流模型 ,建立静止环境中平面负浮力倾斜射流的二维数学模型 ,采用D M Shahrabani和J D Ditmars的试验资料进行检验 ,并且对这类流动进行了数值预报。在此基础上 ,提出了将射流影响区域划分成为三个区的概念 ,即 :射流区、回流区和水平扩展区 ,也给出了射流区和水平扩展区及射流区内部分区的界限。给出了收缩断面的位置及该断面物理量的分布 ,为远区特性计算给出了定解条件。

The k ε turbulence model is used to establish a mathematical model of a plane negatively buoyant inclined jet in static environment Through the comparison of the calculated result and tested data of D M Shahrabani, predictions of these kinds of jets are made The region of this flow can be divided into three parts, namely, jets region, recirculation region and horizontal spreading region The demarcations between jets, horizontal spreading region, and the inner demarcation of jets region are given also The position of the contracted section and the variations of velocity, density and turbulent kinetic energy along the contracted section are given in the end, which can be used as the boundary condition for calculation of far field behavior