裸置海底自沉降热油管道泄漏扩散的数值研究

Numerical Simulation on Leakage and Diffusion of Hot Oil Pipeline of the Own Settlement on the Submarine Naked Place

根据计算流体力学建立海底海泥区域与海水区域的流固耦合传热多相流模型,海泥区域视为饱和含水多孔介质。运用软件模拟了裸置在海底的热油管道在输送过程中泄漏后原油在海泥和海水中的分布情况和温度场的变化情况,并对不同的泄漏点进行了分析。模拟时考虑了裸置海底管道的自沉降和海水中压强的影响。模拟结果表明,泄漏点对泄漏原油的扩散分布有很大影响;当泄漏点在土壤区域开始泄漏时,原油在土壤中呈弧形分布,过一段时间后沿土壤与管道外保温层流入海水中,顶端呈现喷射形,两侧呈螺旋状,并逐渐向海面流动;当泄漏点在海水区域时,泄漏的原油呈现喷射形,在浮力的作用下逐渐向海面流动;泄漏位置不同,海水和海泥温度场的分布有很大差异。海水区域和海泥区域的交界面对原油分布和温度场分布有很大影响。

Based on computational fluid dynamic,a fluid solid coupling heat-transfer model of submarine in two areas was built,which were respectively the area on seawater and the sea mud area,and the sea mud area was disposed of saturated silt porous.Using the software,the leakage during the process of transmission on naked placed hot oil pipeline was simulated,and the changes of distribution of crude oil in the soil and the water of the sea and the changes of the temperature field were analyzed,and different leakage points were analyzed respectively.The settlement of its own of the submarine pipeline on the naked place and the effect of the pressure in the sea water were considered in the simulation.The simulation results showed that different leakage points had a different influence on the distribution of crude oil;when the leakage in the sea mud area happened, the distribution of crude oil in the sea mud was a arc-shape,after a period of time,the crude oil flowed into the sea long the sea mud and pipe insulation,and the top was a spray-shape and the flanks was helix,finally the crude oil flew onto the surface of the sea;when the leakage point was located in the sea area,oil was jet diffusion distribution form and under the action of buoyancy,the crude oil flow gradually onto the sea.As the leak position was different,the water of the sea and the sea mud there had significant differences in the distribution of temperature field.The interface of sea water and sea mud areas had a great impact on the temperature field distribution of crude oil.