混合流体在垂直分支盲管中的流动问题研究

以一个垂直分支盲管为对象,研究其内部的复杂流动状况、油水分离情况、主管流量与盲管内含水率分布之间的关系。在主管不同流速与含水率条件下,采用数值模拟方法及代数滑移混合模型,求解了主管及盲管内油水混合物的流动问题。计算结果显示,盲管由混合区和滞止区组成。混合区主要由2个循环涡组成,随着主管路流体流速的增加,盲管内混合区的长度增长。在滞止区形成了油水分离,且分离程度与滞止区的长度以及主管路的湍流强度有关,在进口速度从0.75 m/s到5.00 m/s变化时,滞止区内的最大含水质量分数从70%下降到30%。该结论对于研究分支盲管内的腐蚀、水合物形成等问题具有一定的指导意义。

Research on the Flow Problem of Mixed Fluid in Vertical Deadleg

Taking a vertical deadleg as the object of study,this paper studies its complex flow condition,oil-water separation as well as the relationship between the flow rate of the main pipe and the water content distribution of the blind pipe.Under different conditions of flow velocities and water rates of the main pipe,the flow problem of the oil-water mixture in the main pipe and blind pipe were solved based on the simulation method of the average Reynolds number and algebraic slip mixed model.The calculation shows that the blind pipe is composed of mixed zone and stagnation zone.The mixed zone mainly consists of two circular vortexes.The length of the mixed zone within the blind pipe increases with the flow velocity of the fluid in the main pipe line.Oil-water separation is formed in the stagnation zone.The degree of separation is related to the length of the stagnation zone and the turbulence strength of the main pipe line.When the entrance velocity changes from 0.75 m/s to 5.00 m/s,the maximum water content within the stagnation zone drops from 70% to 30%.The conclusion can serve as a guide to the study of corrosion and formation of hydrates in the deadleg.