摘要
为了研究清管器结构尺寸对清管作业时管道流场特性的影响,以便寻求较为适合的清管器结构尺寸,以可调速直板清管器为例,利用FLUENT前处理软件Gambit建立了3个不同长径比的可调速清管器工作模型,并对其进行网格划分,然后利用FLUENT流体分析软件对不同长径比的清管器工作时的流场进行数值模拟,得到了不同长径比情况下清管器工作时的流场压力、速度和湍流动能的分布图。以清管器长度尺寸作为优化对象,对数值模拟结果进行对比分析后发现,清管器附近流场波动较剧烈,湍流动能及强度急剧增大,其在清管器内部流场中达到最大;清管器下游流场的湍流强度虽有所下降,但仍然是高湍流强度流动,长径比为1时各指标波动较小,说明长径比为1时对下游的流场影响较小,模拟结果与工程实际经验相符合。研究结果可为清管器的优化设计提供理论依据。
To determine impacts of structures and sizes of pipeline pig to flow fields inside pipelines during pigging operations, and to determine optimal sizes and structures of pipeline pigs, take straight-plate pipeline pig with adjustable velocities as an example, working models for pipeline pigs with adjustable velocities and three different length/diameter ratios have been established for pipeline pigs by using Gambit （a FLUENT pre-processing software）. In addition to division of grids, FLUENT fluid analyzing software has been used to perform numerical simulation to flow fluids in pipelines with different length/diameter ratios during pigging operations. As results, pressures, velocities and distribution of turbulent kinetic energy can be determined for pigging operations in pipelines with length/diameter ratios. With the length of the pipeline pig as the objective for optimization, results of numerical simulation have been reviewed and analyzed to reach following conclusions： flow fields in vicinity of pipeline pig are characterized by violent fluctuations and dramatic increase of turbulent kinetic energy and intensity. In addition, they displayed maximum values in internal flow fields of pipeline pigs; intensities of turbulent flows in fields downstream of the pipeline pig reduced to certain degrees, but they still can be classified as flow with high turbulent flow intensifies. Relevant results show that the fluctuations of various indexes are low at the ratio of L/D=l. It can be seen that this ratio may have minimum impacts to flow fields downstream. Such conclusions coincided well with actual conditions. Relevant researches may provide theoretical supports for design optimization of pipeline pig. （8 Figures, 2 Tables, 12 References）
出处
《油气储运》
CAS
北大核心
2015年第5期562-566,共5页
Oil & Gas Storage and Transportation
基金
国家自然科学基金青年基金"油气管道受阻瞬态流时空演化规律及启动智能封堵方法研究"
50905186
归国留学人员启动基金资助项目"油气管道在线启动隔离机器人瞬态流场变化规律研究"
教外司留[2012]1174
中国石油大学(北京)青年教师专项培养基金资助项目"基于气动肌腱的气动系统非线性控制策略研究"
KYJJ2012-04-19
关键词
清管器
CFD
流场
数值模拟
湍流动能
pipeline pig, CFD, flow field, numerical simulation, turbulent kinetic energy
