Abstract: For the problem of oil leak in different soil particle diameter, using CFD simulation software to establish the soil porous media mid-stream solid coupled mathematical model of phase transitions. The simulation results show that before the leaking, the distribution of isotherms of the steady-state temperature field becomes the sharp of flat circle and the temperature lower from inside to outside. Meanwhile, this distribution does not have obvious changes in the different sizes of soil particles; after the leaking, the isothermal lines in the small particle diameter soil presented divergent patterns with reduction of the distribution from inside to outside. At the same time, with the leakage of oil flowing into the porous medium, the temperature gradient tended to be stable. In large particles soil, because of the low power of oil flow resistance, the change of water which exit in permafrost could happen faster, and the stochastic distribution of the isotherms of the divergent is more obvious. This situation destructed the stable temperature field more seriously.

Key words: 　Leakage , Soil particles , Porous media , Simulation , Isotherm

摘要： 　    针对油品在颗粒直径不同的土壤中的泄漏问题，运用ＣＦＤ模拟仿真软件，建立了土壤多孔介质中流固耦合的相变数学模型。模拟结果表明，泄漏前，稳态温度场各等温线的分布呈扁圆形且由内到外温度依次降低，土壤的颗粒大小不同时未产生明显的变化；泄漏后，在颗粒直径小的土壤中温度场等温线呈发散状由内到外依次减小分布，温度梯度随着泄漏油品持续进入多孔介质而趋于平稳；在颗粒直径大的土壤中，油流阻力小，致使冻土层中水分相变更快，等温线的无规则发散分布现象更为明显，对稳定温度场的破坏更加严重。

关键词: 　泄漏 , 　土壤颗粒 , 　多孔介质 , 　模拟 , 　等温线