天然气输气管道微泄漏流场检测仿真

发布时间：2018-06-15 23:29

本文选题：计算机仿真 + 天然气输气管道　；参考：《计算机仿真》2017年10期

【摘要】：为了避免天然气管道泄漏引发严重事故,必须及时准确地检测出管道的泄漏位置。目前存在的困难是由于微小泄漏给出的各种信息都非常微弱并可能湮灭在噪声背景中,因此需要找到一种不受背景噪声干扰的反映泄漏的特征量。采用计算流体力学方法对管道微泄漏流场检测进行了仿真,建立了管道微泄漏的仿真模型,然后对不同泄漏孔径、不同管道内部压力管道微泄漏流场进行了仿真计算分析。结果表明,当管道发生微小泄漏时泄漏孔附近出现明显的湍流扰动现象;当泄漏孔内外压差越大、泄漏孔径越大,泄漏孔内的流场变化越剧烈,湍流扰动现象越明显。因此,通过对管道内部湍流扰动特性参数如超声波等进行测量,可以检测出天然气管道的微小泄漏故障。
[Abstract]:In order to avoid serious accidents caused by natural gas pipeline leakage, it is necessary to detect the leakage location of the pipeline timely and accurately. At present, it is difficult to find a characteristic quantity which can reflect the leakage without background noise because all kinds of information given by small leakage are very weak and may be annihilated in noise background. The flow field detection of pipeline microleakage is simulated by computational fluid dynamics (CFD) method, and the simulation model of pipeline microleakage is established. Then, the microleakage flow field of different leak aperture and internal pressure pipeline is simulated and analyzed. The results show that there is obvious turbulence disturbance near the leak hole when the small leakage occurs, and the larger the pressure difference inside and outside the leak hole, the larger the leakage aperture, the more intense the flow field in the leak hole is, and the more obvious the turbulence disturbance is. Therefore, the small leakage fault of natural gas pipeline can be detected by measuring the characteristic parameters of turbulence disturbance, such as ultrasonic wave.
【作者单位】：中国石油集团钻井工程技术研究院;华北电力大学能源动力与机械工程学院;
【基金】：国家自然科学基金面上项目(51276059) 中国石油天然气集团公司科技项目(2015E-400602)
【分类号】：TE973.6

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