悬链线立管多相流流型研究

Study on Flow Patterns of Two-phase Flow in Catenary Riser

以水和空气为介质,在不同倾角的水平段和悬链线段组合中,研究气液两相流可能出现的流型及其特点,其中流型主要通过肉眼观察结合压力波动检测的方法来进行辨别.同时针对实验范围内出现的部分流型,研究该流型下管段压力和压降随气液速度以及角度的变化规律,并对悬链线管段为段塞流和严重段塞流时管内含气率、气泡长度、气泡速度、气泡频率等参数进行测量.结果表明:试验范围内共出现9种组合流型,4种组合区域所占区域最广;气液流速的变化对管线压降有一定的影响,水平管段的角度对压降的影响远小于气液速度的影响;液速一定时,段塞流和严重段塞流含气率随气速的增加而增加,气速一定时,段塞流和严重段塞流含气率随液速的增加而减小.

The flow patterns and flow characteristics using water and air as media were studied in this paper,which appear in combination of horizontal pipeline and catenary riser.The flow pattern was judged by observation and measuring the pressure along the pipeline and catenary riser.The change of pressure along the pipeline and pressure drop with different gas and liquid velocities as well as the angle of horizontal pipeline in a part of flow patterns were studied,the parameters such as void fraction,bubble length,bubble velocity,bubble frequency of slug flow and serious slug flow in the catenary riser were measured.The results show that there are four flow patterns occupy the most extensive area in the nine combinations of flow pattern.The changes of gas and liquid flow rates have an impact on the pipeline pressure drop.The impact of the angle of horizontal pipe section to the pipeline pressure drop is much smaller than the flow rates of gas and liquid.When the liquid flow rate remains unchanged,the void fraction of slug flow and serious slug flow increase with the increasing of gas flow rate.When the gas flow rate remains unchanged,the void fraction of slug flow and serious slug flow decrease with the increasing of liquid flow rate.