积水在上倾输油管中运动状态研究

Study on movement of residual water in upward inclined pipeline

应用试验和数值模拟两种方法对积水在管道中的分布以及表观油速、管道倾角对积水运动的影响进行研究。在内径为0.1 m的环道上进行试验,用高速摄像的方法对积水在5°～30°上倾管道中的运动状况进行分析,在管道入口增加微小波动,对试验工况下积水的运动状况进行数值模拟。结果表明:表观油速对积水运动的影响较大,管道中剩余积水量随着表观油速的增大而减小,当表观油速达到临界值时积水能被完全清除;管道倾角对积水运动的影响较小,在4种试验倾角下清除积水所需的临界油速均相同;数值模拟结果与试验结果吻合较好,由于多相流模型的局限性,不能精确地模拟水滴的聚结与破碎。

The distribution of residual water in the pipeline and the effects of superficial oil velocity and inclination angle on the residual water movement were studied through the experiment and numerical simulation. The experiment was done in the loop of inner diameter of 0.1 m. The movement of residual water in 5°-30° upward inclined pipeline was analyzed using the method of high-speed camera. The movement of residual water was simulated by introducing a small perturbation in the inlet of pipeline. The results show that superficial oil velocity plays an important role in residual water movement, and the residual water volume decreases with superficial oil velocity increasing and all the water could be drained off when the superficial oil velocity reaches a critical value. The inclination angle plays a less important role, and the critical velocity keeps the same when the inclination angle is in the range of 5°-3°. The simulation resuhs agree well with the experimental results. Due to the limitations of the multiphase flow model, the water droplet coalescence and breakage can not be simulated accurately.