深埋管道中泄漏孔对燃气泄漏影响的数值模拟*

为研究泄漏孔的各种因素对深埋土体中燃气管道泄漏的具体影响，采用1个包含燃气管道的三维模型，研究单个泄漏孔的大小、位置、形状对于埋地燃气管道泄漏的影响，并建立大小相等的双泄漏孔的燃气管道，确定双泄漏孔间距对于燃气泄漏扩散的影响。结果表明:泄漏孔越大，燃气在土壤中的扩散速度越快，且泄漏孔的大小对深埋燃气管道泄漏的影响最大；泄漏孔位置的影响次之，顶部与侧壁的泄漏孔扩散速度相差无几，底部泄漏孔的扩散速度远低于前2者；双泄漏孔间距的影响较小，双泄漏孔的距离越小，甲烷的扩散速度越快；泄漏孔形状对于深埋燃气管道泄漏扩散的影响非常小。

Numerical simulation on influence of leakage hole on gas leakage in deep buried pipeline

In order to study the specific influence of various factors of leakage holes on the leakage of deep buried gas pipelines,a three-dimensional model containing the gas pipeline was established,and the influence of size,location and shape of single leakage hole on the leakage of buried gas pipeline was studied.A gas pipeline with double leakage holes of the same size was established,then the influence of distance between double leakage holes on the gas leakage and diffusion was determined.The results showed that the larger the leakage hole,the faster the diffusion velocity of gas in the soil,and the size of leakage hole had the greatest influence on the leakage of deep buried gas pipeline.The location of leakage hole had the second important influence,the diffusion velocities of the leakage holes at the top and the side wall were almost the same,and the diffusion velocity of the leakage hole at the bottom was much lower than the former two.The distance between double leakage holes had less influence,the smaller the distance between double leakage holes,the faster the diffusion velocity of methane.The shape of leakage holes had almost no influence on the leakage and diffusion of deep buried gas pipelines.