【作者】 李帆；

【导师】 谭迎新；

【作者基本信息】 中北大学 ， 安全技术及工程， 2009， 硕士

【摘要】 气体爆炸事故每年都会造成重大的经济损失和人员伤亡。受限空间气体燃烧爆炸发展过程较为复杂,空间内可燃气体爆燃所产生的爆炸波对空间内和空间以外的设施建筑都会物造成破坏,特别是在现实环境下,空间内会放置各种形状不一、大小不同、间距随意的生产设施,空间内这些障碍物的存在,发生气体爆炸后,会对爆炸的压力及速度等产生很大的影响。因此,对空间内有障碍物可燃气体爆炸的研究是安全生产领域的主要课题之一,具有十分重要的社会和经济意义。目前,对空间内有障碍物可燃气体爆炸进行研究主要依靠实验,采用实验研究的方法设备投资较大,费用高昂,而且操作起来也比较困难,再加上一些其它方面的技术原因,所能采集到的实验数据往往是十分有限的,因此,仅依靠单纯的实验研究具有较大的局限性,而在实验研究的基础上开展数值模拟研究则是一种有效的方法,这样不仅可以节省大量的人力、物力和财力,还可以获得比实验数据更多、更全面的计算结果,更有助于深入了解管道内可燃气体爆炸的发生、发展过程。本论文的工作正是依托中北大学自行研制的“管道式气体粉尘爆炸试验装置”和相应的实验数据进行管道内置障碍物密闭空间甲烷/空气预混气体爆炸的仿真研究,本文主要基于均相反应流时均方程组、κ-ε湍流模型和EBU-Arrhenius燃烧模型,建立了均相湍流燃烧流动的理论模型。利用SIMPLEC算法,对内置障碍物受限空间内甲烷/空气预混气体爆炸过程进行了二维空间的数值模拟。利用本文建立的数值模型,研究了管道内不同障碍物形状、不同数量、不同间距对火焰传播阵面、速度和压力的影响,得到了有益的结论。通过将数值模拟的结果与实验数据、文献资料进行比较,说明了本文建立的气体爆炸的数值模型可以比较准确地对管道内气体爆炸过程进行模拟计算和数值分析。更多还原

【Abstract】 Gas explosion accidents would lead to great economic damage and people’s hurt every year. The process of gas combustion and explosion in the limited space is very complicated. The explosion wave in space caused by explosion of combustive gas would destroy the infrastructure in or out the space. Especially, in the real circumstance, the manufacture equipments, which are not regular with the shape, size and span, have significant influence in the exploding pressure and velocity. Therefore, the research about the combustive gas explosion in space is the major issue in the safety manufacturing field, which has the important social and economic meaning. Nowadays, the research about the combustive gas with the obstacle in space mainly depends on the way of the experiments, and this method has high equipment’s investment, high cost and difficult in practices. It also could get very limited experiment’s data for some technical reason. Therefore, the way of only relying on the experiment research has limitation, and the numerical simulation based on the experiments is an effective method. Thus, this way could not only save many manpower, material, financial resources, get more comprehensive computing results, be helpful to deeply understand the total process of the combustive gas’s exploding in pipeline.The dissertation is based on the horizontal pipeline combustible gas-dust explosion device and the relevant data developed by the NUC, and research the methane / air premixed gas explosion in sealed pipe with inside obstacles by the way of stimulation. The theoretical modal of homogenous turbulent combustion flow has been established based on the time-averaged equations of homogenous reaction flow, k -εturbulent model and EBU-Arrhenius’s combustion modal. The exploding process of methane / air premixed gas explosion in limited space with inside obstacles is numerically stimulated by the SIMPLEC algorithm in two dimension space. By the numerical modal in this dissertation, it is demonstrated about the influences upon the flaming spread plane, velocity and pressure under the different size, quantity, span of obstacles in pipeline, and the helpful conclusion is get. By the comparison between the numerical stimulation’s results and the experiment’s data, related documents, it is illustrated that the numerical modal about the gas exploding in this dissertation could relatively and precisely stimulation computation and numerical analysis towards the gas exploding in pipeline.更多还原