圆管段塞流型速度分布与减阻规律研究

A Research on Velocity Profile and Drag Reduction Law of Slug Flow in Pipe

以流体力学基本方程为基础,通过对气体在管道中心形成段塞流的相速度分布和阻力规律分析,得到了二次流发生的条件、各相流体速度分布、减阻率关系式以及减阻率曲线。减阻率曲线表明,段塞流的含气量影响其阻力规律,段塞流能产生的减阻很小,而当气体含量处于增阻范围内时,却能使阻力增加很大。因此在利用掺气减阻时应控制段塞流流型的出现。

Research work in this paper is done about drag reduction by aeration from the view of basic equations of fluid mechanics. By analyzing phases velocity profiles and resistance law resulted from gas slug in the pipe center,the condition that the secondary flow occurs,phases velocity profiles, formula of drag reduction and a curve of drag reduction have been obtained. The curve shows that the drag reduction law is affected by proportion of gas ,and the drag reduction rarely happens in slug flow. While gas proportion is in a certain scope,the drag resistance is aggrandized greatly. Therefore some measures should be taken to avoid slug pattern while drag reduction by aeration is applied.