横流中三维线源型倾斜正浮力射流近区特性的数值研究

Numerical study on the near-field behavior of 3-D line inclined positively buoyant jets in cross flows

利用混合有限分析法及交错网格的思想,对横流中有限长线源型倾斜正浮力射流进行了数值计算,成功模拟了端涡现象及其发展过程,得出了产生端涡现象的界限值,还给出了射流横断面上温度最大值偏离对称平面的偏离值与流速比的关系式。数值结果清晰地显示浮射流背流面存在马蹄形的流动结构。

Using the Hybrid Finite Analytic Method (HFAM) and staggered grid, the authors treat numerically the 3-D line inclined positively buoyant jets in cross flows and simulate the phenomena and development of end-vortices successfully. The limit value that whether the inclined jets develop end-votices or not is given, and the relational expression on velocity ratio and stray value that maximum temperature on cross profile strays away the plane of symmetry is also put out. The flowing structure of hoof shape is showed clearly by the numerical results in this paper.