摘要
在油气管输过程中,颗粒对管道的冲蚀导致管道失效从而引发安全事故。本文以90°弯管为研究对象,基于欧拉-拉格朗日方法,采用RNG k-ε湍流模型,并结合Oka磨损预测模型,对气固两相流弯管部件的冲蚀磨损进行仿真预测,分析了弯管内部流场特性,探究了颗粒计算量、颗粒圆整度、颗粒直径对磨损预测的影响。结果表明:气体在弯管部位出现二次流动,沿着弯管角度增大的方向二次流动不断增强,并且速度分布出现明显的扭曲;随着颗粒计算数目的增加,弯管部位最大磨损量先增加然后逐渐趋于一致,可采用最大磨损量作为颗粒数目无关性评价指标;随着固体颗粒圆整度的降低,颗粒与壁面发生碰撞的位置向弯管出口侧偏移,颗粒对壁面的冲蚀磨损量也相应降低;随着颗粒直径的增大,磨损云图呈现不同的分布特征,颗粒对管壁的碰撞位置逐渐向弯管进口侧偏移。
In oil and gas pipeline transportation process,the erosion of particles on the pipeline will lead to the failure of the pipeline and cause safety accidents.In this paper,based on Euler-Lagrange method,the erosion wear of 90°elbow part caused by gas-solid two-phase flow is simulated using RNG k-εturbulence model and Oka wear prediction model.The characteristics of flow field inside the elbow are analyzed,and the effects of particle count,particle roundness and particle diameter on the wear prediction results are discussed.The results show that the secondary flow occurs at the elbow,and the secondary flow enhances along the gas flow direction,and the velocity distribution is distorted obviously.With the increase of the calculated number of particles,the maximum wear amount at the elbow first increases and then gradually tends to be consistent.The maximum wear amount can be used as the evaluation index of particle number independence.With the decrease of the roundness of solid particles,the collision between the particles and the wall surface shifts to the outlet of the elbow,and the erosion wear of the particles to the wall surface of the pipeline also decrease accordingly.With the increase of particle diameter,the wear cloud pattern shows different distribution characteristics,and the impact position of particles on the pipeline wall gradually shifts to the inlet of the elbow.
作者
卓柯
邱伊婕
张引弟
吴迪华
ZHUO Ke;QIU Yijie;ZHANG Yindi;WU Dihua(School of Petroleum Engineering,Yangtze University,Wuhan,Hubei 430100,China;Fengcheng Oilfield Operation Area,Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2020年第6期100-106,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
油气藏地质开发工程国家重点实验室开放基金课题(PLN201606)。
关键词
冲蚀磨损
油气管道
气固两相流
数值模拟
erosion wear
oil/gas pipeline
gas-solid two-phase flow
numerical simulation
