【摘要】 土壤作为一种典型的多孔介质,其内部流体的流动与相变过程复杂,常采用有限体积法作为理论研究方法。取西部成品油、原油管道玉门出站口作为研究对象,地表温度变化采用周期性边界条件,考虑土壤发生冰水相变时释放的相变潜热。模拟结果表明,管壁热流密度随环境温度周期性变化,土壤中的水分向冻结前锋进行迁移,无保温层的管道比有保温层的冻土融化范围大,融化深度深。更多还原

【Abstract】 Soil is a typical porous media,fluid flow and phase transition process in the soil are very complex.The finite volume method is often used as a theoretical approach.In this paper,taking Yumen station of crude oil and product oil western pipelines as the research object,using ground surface temperature change as periodic boundary conditions,through considering phase change latent heat released by the ice-water phase change,numerical simulation of hydrothermal coupling temperature field for frozen soil area around pipelines laying in one ditch was carried out.The results show that: the wall heat flux periodically changes with the ambient temperature,soil moisture is migrating forward to the freezing front.Permafrost melting range and thaw depth of pipelines without insulating course are bigger and deeper than those of pipelines with insulating course.更多还原