中文摘要：

实验研究了集输一立管系统内空气一水的两相流动，将其流动结构分为稳定和非稳定两大类流型并建立宽广流速范围内的流型图；揭示了非稳定流动中不规则流型流动特性及其形成机理；集输一立管系统内液相的逐渐积累是不稳定阶段建立的关键因素，多次喷发导致系统内液量的大量减少，在低折算液速下不能及时弥补减少量是稳定阶段建立的主要因素。实验发现，中高折算速度条件下，立管整体压差波动幅度与水平管段压差波动幅度均随折算速度的增大先增大后减小；而在低折算速度条件下，则表现为单调递减的变化规律；并建立了各自相应的压差波动特性等高线图。

英文摘要：

Air-water two-phase flow in pipeline-risers was investigated in this paper, where the flow structure was divided into two major patterns of stable flow and unstable flow. A flow regime map within the wide range of flow velocity was built up. Experiments revealed the flow characteristics and formation mechanism of irregular flow regime. In pipeline-riser system, the gradual accumulating of liquid phase is the key factor for establishment of the unstable stage; while being unable to fill the liquid reduction caused by occasional cyclic eruptions during the low liquid velocity is the critical factor for establishment of the stable stage. Under moderate and high superficial velocities, with the increase of the superficial gas or liquid velocity, the fluctuation magnitude of differential pressures along the riser and along the horizontal pipe differential pressure first increases and then decreases, while under low superficial velocities, the fluctuation magnitude decreases monotonically. Meanwhile, the corresponding contour maps of differential pressure fluctuations were presented respectively.