Abstract: For the study of variable diameter tube affects the quantity of sequential oil transportation of the refined oil, applying multiphase flow model, the 90# gasoline and 0# diesel oil as the object of alternate transportations, according to different variable diameter pipeline structure form and different tapered Angle on the oil transportation.The results show that the growth rate of the length of the mixing section decreases obviously and the length of the mixing section decreases for a short time when the mixing oil enters the sudden expansion pipe, then the length of the mixed oil section growth accelerated obviously, but inferior to the level before variable diameter and with the increase of taper Angle, the different length were mixed with different degrees of decreased; after the mixed oil section flows into reducing pipe, the length of the mixed oil section growth obviously larger, and appeared the trend of decrease, but still higher than before the variable diameter, and with the increase of tapered tube taper Angle, the length of the mixed oil section all have varying degrees of increase.

Key words: Refined oil productions, Batch transportation, Reducer pipe, Numeral calculations, Mixed oil section

摘要： 为研究变径管对成品油顺序输送混油量的影响，应用多相流模型，将90#汽油与0#柴油两种油品作为交替输送对象，对成品油管道的变径方式及变径角度对成品油顺序输送混油量的影响进行数值计算，得到了混油量分布情况，并对其结果进行了分析。结果表明，混油进入突扩管中，混油段长度增长速度明显降低，混油段长度也出现短时间的减小，而后混油段长度增长速度明显加快，但低于变径前的水平，且随着变径角度的增加，混油段长度均有不同程度的减小；混油段流入渐缩管后，混油段长度增长速度显著变大，而后出现减小的趋势，但仍高于变径前的水平，且随着渐缩管变径角度的增加，混油段长度均有不同程度的增加。

关键词: 成品油, 　顺序输送, 　变径管, 　数值计算, 　混油段