泄漏油品在雨水作用下渗透范围模拟计算

对埋地管道下部泄漏油品在雨前、雨中和雨后的不同水分分布土壤中油品渗透扩散进行模拟分析,借助CFD软件建立土壤多孔介质中油水两相流动的三维流动传质耦合模型。模拟计算结果表明:油品在地下渗透扩散范围受水分分布影响明显,泄漏油品在下雨前的土壤中地下扩散区域以不倒翁状向四周渗透;雨中泄漏油品受雨水冲带后在地下四处流窜并以极不规则形状区域向四周扩散;雨后泄漏油品以烧瓶状区域向四周扩散。在雨前、雨中和雨后三种工况下,扩散速率稳定后,雨后的泄漏范围及地表扩散面积均是最小;雨中油品泄漏范围最大且增长速率比雨前高约3%;雨前油品地表扩散范围最大且增长速率比雨中高约2%。

Simulation Computation of Penetration Range of Leaking Oils Under the Action of Rainwater

Conducted is simulation analysis on effect of different moisture distribution in underground soil on seepage and diffusion range of leaking oils in lower portion of buried oil pipeline before,during and after rain.With the help of CFD software,established is a three-dimensional flow and mass coupling model for oil-water two-phase flow in soil porous media.Simulation results show that moisture distribution has significant effect on underground seepage and diffusion range of leaking oils,the leaking oils will permeate and diffuse around with a "daruma" shape in underground soil before rain,such oils will run around with rainwater in underground soil during rain and diffuse around with great irregularity shape and diffuse around with flask shape in underground soil after rain.After diffusion rate is steady,the leakage range and ground diffusion area after rain is the minimum,the leakage range during rain is the maximum and its growth rate is about more 3 % than before rain and the ground diffusion range before rain is the maximum and its growth rate is about more 2 % than during rain.