Diagnosis of the single leakage in the fluid pipeline through experimental study and CFD simulation
Diagnosis of the single leakage in the fluid pipeline through experimental study and CFD simulation
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DOI：
10.1016/j.petrol.2020.107437
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发表时间：
2020-10-01
影响因子：
--
通讯作者：
Ling, Kegang
中科院分区：
文献类型：
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作者：
Fu, Hao;Yang, Lu;Ling, Kegang
长输管道泄漏现象普遍存在，管道安全管理体系对油气输送至关重要。安全隐患可能是由于设计和施工缺陷，受自然灾害影响，或被传动液腐蚀造成的。因此，快速检测不仅可以减少输送油气的损失，而且可以保护当地的环境。在这项研究中，我们开发了一种新的方法来检测管道泄漏通过泄漏的压力分布分析。管道泄漏检测测试使用流动回路进行。通过实验记录了管道进出口的压力和流量等四个参数。然后通过对流动参数的无因次分析，确定泄漏的具体位置。为了生成定位泄漏的解决方案，我们引入了三个无量纲变量，即无量纲泄漏位置、无量纲泄漏率和无量纲压降。通过建立的仿真模型，建立了压力分布与泄漏参数之间的关系。利用商业软件FLUENT进行三维计算流体动力学（CFD）模拟后，用实验数据验证实验中泄漏管道内的压力分布。最后，建立了管道泄漏检测与评价的数学模型。CFD模拟结果表明，泄漏量和泄漏位置对管道内压力分布有显著影响，这与实验结果一致。无因次泄漏位置越小或无因次泄漏率越大，无因次压降越小。基于这些无量纲变量建立的数学模型可用于真实的事故泄漏点的定位。
The pipeline safety management system is crucial to transfer oil and gas because the phenomena of leakage commonly occurs in the long -distant pipelines. Hidden safety hazards can be caused by design and construction defects, affected by natural disasters, or corroded by the transmission fluid. Therefore, quick detection will not only reduce the loss of transported oil and gas but also can protect the local environment. In this study, we develop a new method to detect the pipeline leak by analyzing pressure distribution through the leak. Pipeline leak detection tests are operated using a flow loop. Through the experiments, four parameters which are pres- sures and flow rates of pipeline inlet and outlet are recorded. Then the specific location of the leak is determined by dimensionless analysis of flow parameters. To generate the solution to locate the leak, we introduce three dimensionless variables, which are dimensionless leak location, dimensionless leak rate, and dimensionless pressure drop. Then the relationship of pressure distribution and leak parameters is built through the simulation models. After running 3D computational fluid dynamics (CFD) simulations with commercial software (FLUENT), the pressure distribution in the pipeline with leakage in the experiments will be verified by the experimental data. Finally, the mathematical models are developed to detect and evaluate the leakage through the pipeline. CFD simulation results show that both the leak rate and location have significant effects on the pressure dis- tribution through the pipe, which is identical to the outcome from the experiments. When the dimensionless leak location is smaller or the dimensionless leak rate is larger, the dimensionless pressure drop is smaller. The mathematical model which is based on these dimensionless variables can be applied in locating the leak point in the real accident.