摘要
油水环状流通过突缩管时,缩颈和细管入口处会形成涡旋,加剧两相界面波动,两相界面波特性的研究对探索油水环状流的流型演变、管内压降等具有重要意义.通过大涡模拟研究突缩管内油水环状流的界面特性,结果表明:突缩管内的二次流、脱体涡的产生和发展对油水两相界面有较大影响,随着水相表观流速的增大,细管入口涡区增大并向下游延伸,出现涡脱落,对油水界面造成明显的扰动.水相表观流速与管径比越大,两相界面波动越剧烈;表面活性剂可提高水环稳定性和管输能力.数值模拟了在不同浓度活性剂溶液作用下的界面特性:涡区有不同程度的增大,涡度略有减小,对两相界面波动影响不大.
Vortexes are formed at the necking and entrance of the narrow tube when oil-water annular flow passes through the sudden contraction pipe,which aggravate two-phase interface wave.Research on the characteristics of the two-phase interface wave is significance to explore the flow pattern evolution and the pressure drop in pipe.Large eddy simulation method is used to study on interface characteristics of oil-water annular flow in sudden contraction pipe.The results indicate that the generation and development of the secondary flow and the trapped vortex have great influence on the oil-water interface.With the increase of the apparent velocity of the water phase,the vortex area at the entrance of the thin pipe increases and extends downstream,resulting in vortex shedding and obvious disturbance to the oil-water interface.The larger diameter ratio and apparent velocity of water phase,the more intense the fluctuation of interface.Surfactant can improve the stability of water ring and the ability of pipeline transportation.The interface characteristics under the action of different concentrations of additive solution were simulated.The results indicate that the vorticity decreases slightly with the increase of vorticity,which has little effect on the interfacial wave.
作者
江帆
黄海涛
陈美蓉
黄浩翔
Jiang Fan;Huang Haitao;Chen Meirong;Huang Haoxiang(School of Mechanical and Electrical Engineering,Guangzhou University,Guangzhou 510000,China)
出处
《宁夏大学学报（自然科学版）》
CAS
2023年第3期226-233,共8页
Journal of Ningxia University(Natural Science Edition)
基金
广州市科技计划资助项目(202102010386)。
关键词
大涡模拟
油水环状流
界面波动
突缩管
表面活性剂
LES
oil-water annular flow
interfacial fluctuation
sudden contraction pipe
surfactant
