基于Fluent的城镇LPG管道泄漏事故后果及影响因素分析  

Analysis on the leakage consequences and influencing factors of urban LPG pipeline by Fluent

作　　者：尚融雪[1] 李子浩 张新伟 张培红[1] SHANG Rong-xue;LI Zi-hao;ZHANG Xin-wei;ZHANG Pei-hong(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Institute of Public Safety Research,Department of Engineering Physics,Tsinghua University,Beijing 100084,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]清华大学工程物理系公共安全研究院,北京100084

出　　处：《广西大学学报（自然科学版）》2019年第1期292-297,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家十二五科技支撑计划项目(2015BAK16B01)

摘　　要：为分析城镇LPG管道泄漏扩散规律及其影响因素,建立了重气在大气中泄漏扩散的FLUENT数值模拟模型,并与实验结果进行对比,验证了基于FLUENT的重气扩散数值模拟模型的可行性和准确性。以某城市LPG管道为研究对象,利用RNG k-ε模型,分析了环境风速、障碍物以及城镇地形条件对LPG泄漏事故后果的影响。结果表明,风速的增加造成泄漏源处形成的膨胀云层减小,加剧了LPG在下风向的输运,增大了近地面区域LPG泄漏的危险性。障碍物的宽度越大,迎风面对LPG管道泄漏扩散的阻挡效应愈显著,有利于抑制LPG气云向背风侧近地区域的扩散蔓延,但应注意背风面涡流造成火灾爆炸危险性加剧的现象。当LPG管道在低洼地形和城市高楼间泄漏时,LPG管道泄漏事故危险性急剧增加。In order to analyze the influencing factors and diffusion rules of LPG pipeline leakage accident in urban area,the FLUENT numerical simulation model of LPG leakage and diffusion in the atmosphere was established and compared with the experimental results to prove the feasibility and accuracy of the simulation model.With an urban LPG pipeline as the research object,this research analyses the influence of atmospheric wind speed,obstacles and terrain on the diffusion of LPG pipeline leakage by RNG k-ε turbulent model.The research results illustrate that,the increase in wind speed decreases the expansive clouds near the leakage source,exacerbates the transport of LPG pipelines along the downwind direction,the risk of LPG leakage in near ground area increased.Moreover,with the increase of the width of the obstacles,the obstruction effect of the obstacleswindward faces becomes more significant and helps control the spread near the ground at the leeward faces.However,it should be noted that the eddy current on the leeward side aggravates the danger of fire and explosion.When LPG pipeline leaks in the urban canyon,the risk of the leakage accident increased dramatically.

关 键 词：液化石油气 泄漏 扩散 湍流 数值模拟 

分 类 号：X937[环境科学与工程—安全科学] TE88[石油与天然气工程—油气储运工程]