本文選題：安全工程　切入點(diǎn)：天然氣泄漏　出處：《安全與環(huán)境學(xué)報(bào)》2017年01期

【摘要】：為了掌握埋地穿越段天然氣管道泄漏擴(kuò)散特性、防止因管道泄漏引起的火災(zāi)爆炸等事故發(fā)生,研究了埋地穿越段天然氣管道泄漏擴(kuò)散的機(jī)理。針對(duì)埋地穿越段天然氣管道泄漏擴(kuò)散問題,運(yùn)用多孔介質(zhì)模型,結(jié)合三大守恒方程,構(gòu)建了基于計(jì)算流體力學(xué)的數(shù)值模型,探討了大小孔隙率特性下,對(duì)非線性對(duì)流項(xiàng)和壓力梯度項(xiàng)分別采用4種不同離散格式組合方式時(shí)的天然氣體積分?jǐn)?shù)分布,并與試驗(yàn)進(jìn)行對(duì)比分析。以泰州至戴南的埋地穿越段天然氣管道泄漏進(jìn)行實(shí)例研究。結(jié)果表明:大孔隙率特性下,一階standard格式在精度和計(jì)算速度上要優(yōu)于其他離散格式,與試驗(yàn)結(jié)果更加接近;小孔隙率特性下,二階presto!格式相比其他幾種壓力離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.
【作者單位】： 遼寧石油化工大學(xué)石油天然氣工程學(xué)院;中國(guó)石油大學(xué)(華東)儲(chǔ)運(yùn)與建筑工程學(xué)院;遼寧石油化工大學(xué)計(jì)算機(jī)與通信工程學(xué)院;遼寧石油化工大學(xué)化學(xué)化工與環(huán)境學(xué)部;
【基金】：遼寧省高等學(xué)校優(yōu)秀人才支持計(jì)劃項(xiàng)目(LJQ2014038)
【分類號(hào)】：TE88

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