不同离散格式下埋地穿越段天然气管道泄漏扩散数值研究

发布时间：2018-03-27 05:28

本文选题：安全工程　切入点：天然气泄漏　出处：《安全与环境学报》2017年01期

【摘要】：为了掌握埋地穿越段天然气管道泄漏扩散特性、防止因管道泄漏引起的火灾爆炸等事故发生,研究了埋地穿越段天然气管道泄漏扩散的机理。针对埋地穿越段天然气管道泄漏扩散问题,运用多孔介质模型,结合三大守恒方程,构建了基于计算流体力学的数值模型,探讨了大小孔隙率特性下,对非线性对流项和压力梯度项分别采用4种不同离散格式组合方式时的天然气体积分数分布,并与试验进行对比分析。以泰州至戴南的埋地穿越段天然气管道泄漏进行实例研究。结果表明:大孔隙率特性下,一阶standard格式在精度和计算速度上要优于其他离散格式,与试验结果更加接近;小孔隙率特性下,二阶presto!格式相比其他几种压力离散方式具有更高的求解精度。
[Abstract]:In order to grasp the leakage and diffusion characteristics of natural gas pipeline in the buried section and prevent accidents such as fire and explosion caused by pipeline leakage, In this paper, the mechanism of leakage and diffusion of natural gas pipeline in buried crossing section is studied. A numerical model based on computational fluid dynamics is constructed by using porous media model and three conservation equations. The volume fraction distribution of natural gas under the characteristics of large and small porosity is discussed when the nonlinear convection term and the pressure gradient term are combined with four different discrete schemes respectively. The results show that the first order standard scheme is superior to other discrete schemes in accuracy and calculation speed under the characteristics of macroporosity. The results are closer to the experimental results. The scheme has higher accuracy than other pressure discretization methods.
【作者单位】：辽宁石油化工大学石油天然气工程学院;中国石油大学(华东)储运与建筑工程学院;辽宁石油化工大学计算机与通信工程学院;辽宁石油化工大学化学化工与环境学部;
【基金】：辽宁省高等学校优秀人才支持计划项目(LJQ2014038)
【分类号】：TE88

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