大尺寸通风管网中障碍物对瓦斯爆炸冲击波传播特性影响的数值模拟
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摘要
为了研究大尺寸通风管网中的瓦斯爆炸传播规律,采用数值模拟方法,针对具有不同障碍物数量的大尺寸通风管网模型,利用Fluent分析管网中各个监测点的超压变化曲线以及障碍物附近的速度矢量图,分析爆炸冲击波传播规律。研究结果表明:初期瓦斯爆炸后,障碍物的存在改变了通风管网内未燃瓦斯的积聚区域;高温和高压发生耦合作用,在氧气相对充足的进气管道中形成二次爆炸;障碍物与火焰波以及管网自身结构变化等多种因素形成复合作用,改变了通风管网内瓦斯爆炸冲击波的传播路径和叠加区域的位置;无障碍物时高压区域出现在进气管道中,有障碍物时高压区域出现在中部直管与斜管的交汇处附近,且数值相对较大。
At present,the research on the propagation laws of gas explosion mainly focuses on single pipe or simple bifurcated pipe without ventilation. In order to study the propagation laws of gas explosion in the large size ventilation pipe network,through using the method of numerical simulation and aiming at the model of large size ventilation pipe network with different amounts of obstacle,the change curve of overpressure at each monitoring point and the velocity vector diagrams around the obstacle in the pipe network were analyzed by using Fluent,and the propagation laws of explosion shock wave were analyzed.The results showed that after the initial gas explosion,the existence of obstacle changed the accumulation area of unburned gas in the ventilation pipe network. The secondary explosion occurred in the intake pipe with relatively sufficient oxygen due to the coupling effect of high temperature and high pressure. The propagation path of shock wave caused by gas explosion and the location of superimposed area in the ventilation pipe network changed due to the combined effect of multiple factors including the obstacle,flame wave,structural change of pipe network,etc. The high-pressure area appeared in the intake pipe when there was no obstacle,while when there was an obstacle,the high-pressure area appeared near the intersection of middle straight pipe and inclined pipe,with a relatively large value.
At present,the research on the propagation laws of gas explosion mainly focuses on single pipe or simple bifurcated pipe without ventilation. In order to study the propagation laws of gas explosion in the large size ventilation pipe network,through using the method of numerical simulation and aiming at the model of large size ventilation pipe network with different amounts of obstacle,the change curve of overpressure at each monitoring point and the velocity vector diagrams around the obstacle in the pipe network were analyzed by using Fluent,and the propagation laws of explosion shock wave were analyzed.The results showed that after the initial gas explosion,the existence of obstacle changed the accumulation area of unburned gas in the ventilation pipe network. The secondary explosion occurred in the intake pipe with relatively sufficient oxygen due to the coupling effect of high temperature and high pressure. The propagation path of shock wave caused by gas explosion and the location of superimposed area in the ventilation pipe network changed due to the combined effect of multiple factors including the obstacle,flame wave,structural change of pipe network,etc. The high-pressure area appeared in the intake pipe when there was no obstacle,while when there was an obstacle,the high-pressure area appeared near the intersection of middle straight pipe and inclined pipe,with a relatively large value.
引文
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[17]乔丹.化学动力学与传递[M].宋心琦译.北京:清华大学出版社,1985.
[2]许盛铭.复杂管道内瓦斯爆炸冲击波、火焰波及有毒气体传播规律研究[D].焦作:河南理工大学,2015.
[3]李鹏,刘剑,高科.管道内瓦斯爆炸温度与压力峰值试验研究[J].安全与环境学报,2015,15(2):59-63.LI Peng,LIU Jian,GAO Ke. Experimental study on peak temperature and pressure of gas explosion in pipeline[J]. Journal of Safety and Enviroment,2015,15(2):59-63.
[4] SALZANO E,MARRA F S,RUSSO G,et al. Numerical simulation of turbulent gas flames in tubes[J]. Journal of Hazardous Materials,2002,95(3):233-247.
[5]邱进伟.瓦斯爆炸冲击波在管网内传播特征及灾变过程仿真研究[D].淮南:安徽理工大学,2018.
[6]林柏泉,叶青,翟成,等.瓦斯爆炸在分岔管道中的传播规律及分析[J].煤炭学报,2008,33(2):136-139.LIN Baiquan,YE Qing,ZHAI Cheng,et al. The propagation rule of methane explosion in bifurcation duct[J]. Journal of Coal Mine,2008,33(2):136-139.
[7]叶青,林柏泉.受限空间瓦斯爆炸传播特性[M].徐州:中国矿业大学出版社,2012.
[8]蔺照东.井下巷道瓦斯爆炸冲击波传播规律及影响因素研究[D].太原:中北大学,2014.
[9]蔺照东,李如江,刘恩良,等.障碍物对瓦斯爆炸冲击波影响研究[J].中国安全生产科学技术,2014,10(2):28-32.LIN Zhaodong,LI Rujiang,LIU Enliang,et al. Impact of obstacles on shock wave of gas explosion[J]. Journal of Safety Science and Technology,2014,10(2):28-32.
[10]余明高,纪文涛,温小萍,等.交错障碍物对瓦斯爆炸影响的实验研究[J].中国矿业大学学报,2013,42(3):349-354.YU Minggao,JI Wentao,WEN Xiaoping,et al. Experimental study on the effect of staggered obstacles on gas explosion[J]. Journal of China University of Mining and Technology,2013,42(3):349-354.
[11]秦涧,谭迎新,王志青,等.管道内障碍物形状对瓦斯爆炸影响的试验研究[J].煤炭科学技术,2012,40(2):60-62.QIN Jian,TAN Yingxin,WANG Zhiqing, et al. Experimental study on the influence of the shape of obstacles in pipelines on gas explosion[J]. Coal Science and Technology,2012,40(2):60-62.
[12]高科,贾进章,刘永红.爆炸冲击波及高温耦合引起瓦斯二次爆炸特性研究[J].中国安全生产科学技术,2016,12(4):35-38.GAO Ke,JIA Jinzhang,LIU Yonghong. Study on the characteristics of gas secondary explosion caused by explosion shock wave and high temperature coupling[J]. Journal of Safety Science and Technology,2016,12(4):35-38.
[13] IBRAHIM S S,MASRI A R. The effects of obstructions on overpressure resulting from premixed flame deflagration[J]. Journal of Loss Prevention in the Process Industries,2001,14(3):213-221.
[14] HULD T,PETER G,STADTKE H. Numerical simulation of explosion phenomena in industrial environments[J]. Journal of Hazardous Materials,1996,46(2-3):185-195.
[15] CHANG K S,KIM J K. Numerical investigation ofinviscid shock wave dynamics in an expansion tube[J]. Shock Waves,1995,5(1-2):33-45.
[16] HUANG Zhian,LIU Zhigang,CHEN Shengguo,et al. Numerical simulation and study on the transmission law of flame and pressure wave of pipeline gas explosion[J]. Safety Science,2012,50(4):806-810.
[17]乔丹.化学动力学与传递[M].宋心琦译.北京:清华大学出版社,1985.