埋地燃气管道泄漏扩散过程数值模拟

Numerical simulation of leakage of gas from buried pipeline and its diffusion process

为减少天然气输送过程因泄漏引发的安全问题,构建埋地燃气管道泄漏扩散过程的三维计算流体动力学（CFD）模型,研究管道入口压力、泄漏孔尺寸、泄漏孔形状和土壤孔隙率等各参数对泄漏量与扩散范围的影响,拟合埋地管道燃气泄漏量与各参数的经验关联式,并通过公开文献中的试验数据进行验证。结果表明：泄漏量与扩散距离都随着管道入口压力、土壤孔隙率和泄漏孔尺寸的增大而增大,管道直径和泄漏孔形状对泄漏量的影响较小;在设定管道入口压力为2.1和156 k Pa的条件下,拟合的经验关联式计算值与试验值的误差分别为7.18%和19.79%,证明关联式具有其有效性,可为计算埋地管道燃气泄漏量提供理论指导。

To reduce safety issues caused by leakage in the process of natural gas transportation,a three dimension CFD model was built for analyzing the leakage of gas from a buried pipeline and its diffusion process in the soil. Effects of inlet pressure,size of leakage hole,shape of leakage hole,and soil porosity on the leakage rate and diffusion range were investigated. An empirical relational expression was established for leakage rate of gas from buried pipeline. The expression was validated with experimental data from public literature. The results show that both the leakage rate and the diffusion distance increase with the growth of inlet pressure,soil porosity and size of leakage hole,that the effects of pipe diameter and shape of leakage hole on the leakage rate are weak,and that under the conditions that inlet pressures of the pipeline are 2. 1 and 156 k Pa,the errors relative between the calculated values from the empirical expression and experimental values are 7. 18% and 19. 79%,respectively,validating the expression.