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针对长输天然气架空管道泄漏问题,综合考虑风速随海拔变化的边界条件、管道管形及泄漏方向等因素,建立非稳态泄漏模型,对不同管道泄漏压力和不同天然气浓度边界的天然气非稳态泄漏扩散进行了数值模拟。结果表明:在天然气向下泄漏的工况下,天然气气团主要在地面积聚,呈无规则的扩散;天然气管道泄漏压力与气体泄漏扩散速度成正比,与天然气浓度边界达到稳定所需时间成反比:不同泄漏压力下天然气扩散稳定后的扩散距离及泄漏影响面积大致相同;天然气浓度边界越小,达到稳定所需时间越长。
In view of the long-distance natural gas pipeline leakage problem, the non-steady-state leakage model is established considering the boundary conditions of wind speed changing with elevation, the pipe shape and the direction of leakage, and the natural gas unsteady state of different pipeline leakage pressure and different natural gas concentration boundaries Spill diffusion was numerically simulated. The results show that the natural gas mass accumulates mainly on the ground and spreads irregularly when the natural gas leaks downward. The natural gas pipeline leakage pressure is proportional to the gas leakage diffusion rate and inversely proportional to the time required for the gas concentration boundary to stabilize: Diffusion pressure and area of leakage under natural gas diffusion stability under different leakage pressures are approximately the same; the smaller the natural gas concentration boundary is, the longer it takes to stabilize.