立管严重段塞流的一维数值计算与试验对比

One dimensional numerical calculation and experimental comparison of severe slug flow in marine riser

针对海洋立管的严重段塞流现象,在等温条件下,采用特征线法,根据下倾管和立管中的气液相连续性方程和动量守恒方程,以及严重段塞流的4个不同阶段的特点,考虑气相的压缩性,分别建立了4个阶段相应的瞬态流动模型,进而得到了准平衡态的一维立管系统严重段塞流物理模型。将模型计算结果和立管试验数据进行对比,结果表明:计算得到的段塞周期和立管底部压力等特征参数与试验数据吻合较好。

The slug flow in marine risers is severe. In this paper, the characteristic method was used to explore this phenomenon. The severe slug flow presents different characteristics in four stages. According to the continuity equation and momentum conservation equation of gas-liquid phase in downdip pipe and riser, combined with gas compressibility, the transient flow models corresponding to four stages were established in constant temperature. And then, a quasi-equilibrium one dimensional physical model was developed for the severe slug flow in riser system. Finally, the calculation results were compared with the experimental data. It is shown that the caculated characteristic parameters（e.g. slug period and riser bottom pressure） are in good agreement with test data.