地形诱导的弹状流生成特性研究

通过对受丘陵地形影响的油气两相管流的模拟试验研究，观察到这种两相流具有复杂的流动特性，它与普通两相流在各自倾角管段上的流动不同。由于丘陵地形的影响，油气两相流在流动过程中的流动特性会发生很大变化，最明显的首先是流型的变化，油气两相流流经向下倾斜管段和向上倾斜管段的下凹肘部时，会有新的液弹产生；流经向上倾斜管段和向下倾斜管段的上凸肘部时，原有的液弹则可能会消失。上游水平段已有的弹状流在流经丘陵管道时，弹状流的特性如频率和液弹长度都会发生变化。

Study on the Slug Flow Induced by Hilly Terrain

The first experimental system fabricated by the authors for oil/gas two-phase flow in hilly terrain pipelines is described,which is connected sequentially by a number of test sections of different inclinations.Complex flow characteristics are observed to be different from those flowing individually in straight pipes of the same inclinations. The most remarkable difference lies in the flow patterns formed. For example, as the oil/gas flow passes through the down-elbow part of the pipeline,new liquid slugs can be formed,while passing through the up-elbow part, the originally existed slugs will disappear. And, when liquid slug passes through the hilly terrain pipeline, some of its characteristics such as its frequency and liquid slug length may change even if the slug flow does not disappear. The experimental results obtained in this paper are important for the further theoretical study as well as the designs of oil/gas transportation pipelines and the separator.