起伏管道中成品油携杂质的流动状态

Flow regimes of oil product carrying impurity in undulate pipeline

针对成品油管道中存在的油携杂质流动问题,建立了成品油携水携杂质试验环道装置,研究了油携杂质的流动状态,并进行了油携水类比试验;采用大涡模拟方法对油相流场进行仿真模拟,分析了流场对杂质运动的影响。研究表明:油携杂质固液两相流型可分为颗粒流、移动床流及固定床流3种;颗粒加入量越少,油品流速越高,流型由移动床流向颗粒流的转换越快;杂质沉积点位于上倾段后的高点位置,此处管道下侧壁面边界层增厚,油流曳力减弱,二次流有利于杂质聚集;杂质是否在杂质沉积点沉积与油品流速有关,与颗粒加入量无关;类似于杂质颗粒,小体积水团也会在杂质沉积点沉积。研究结果为成品油管道的安全输送提供了保障。

Oil product carries impurity while it flows in oil product pipelines. In order to research this issue, the experimental loop system of oil product carrying water and impurity was established to explore the flow regimes of oil carrying impurity. Then, the contrast experiment of oil carrying water was carded out. And finally, the oil flow field was numerically simulated by means of large eddy stimulation （LES） and the effect of flow field on impurity movement was analyzed. It is shown that the solid-liquid two-phase flow regimes of oil carrying impurity are divided into 3 types, i.e., grain flow, moving bed flow and fixed bed flow. With the decreasing of grain content, the flowing velocity of oil product increases and the transition of flow regime from moving bed flow to grain flow speeds up. Impurity sedimentation point is situated at the high position behind the updip section where the boundary layer at the lower part thickens and the oil drag force decreases. The secondary flow is favorable for impurity accumulation. Whether the impurity deposits at the impurity sedimentation point depends on the flowing velocity of oil product, but it isn＇t related to the grain content. Small-volume water mass is similar to impurity grains, and it can also deposit at the impurity sedimentation point. The research results provide assurance for the safe transportation of product oil pipeline. （7 Figures, 2 Tables, 26 References）