室内天然气泄漏扩散的模拟研究
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摘要
利用Fluent软件进行室内天然气泄漏扩散的模拟计算。分析可燃区域随泄漏时间的变化规律,研究泄漏时间、窗户位置及门窗开启程度对天然气泄漏扩散的影响。计算结果表明:门窗关闭的情况下,可燃区域的体积会达到一个最大值。门窗开启的情况下,最终会达到一个稳定的状态。随着泄漏时间的增加,室内天然气的体积分数不断增大,当门窗全部开启的时候,天然气体积分数最终会稳定在4.55%。门窗开度越大,越先达到稳定,稳定时室内天然气体积分数越低。窗户位置一定范围的变化不影响室内燃气质量分数分布,只改变流场。对燃气泄漏报警器的安装位置进行优化模拟。
The simulation calculation of leak diffusion of indoor natural gas is conducted by Fluent software.The variation law of the flammable area with the leak time is analyzed,and the influences of the leak time,the location and opening degree of doors and windows on the leak diffusion of natural gas are studied.The calculation results indicate that when doors and windows are closed,the volume of the flammable area will reach a maximum value,and the volume of the flammable area will reach a stable state when doors and windows are opened.The volume fraction of natural gas increases with the increasing of leak time,and it will reach a stable state of 4.55% when doors and windows are fully opened.The greater the opening degree of doors and windows,the shorter the time to reach a stable state,and the lower the volume fraction of the indoor natural gas at the stable state The position of windows during the change in a certain range does not affect the distribution of the volume fraction of the indoor natural gas,but can change the flow field.The installation location of gas leak alarm is optimized and simulated.
The simulation calculation of leak diffusion of indoor natural gas is conducted by Fluent software.The variation law of the flammable area with the leak time is analyzed,and the influences of the leak time,the location and opening degree of doors and windows on the leak diffusion of natural gas are studied.The calculation results indicate that when doors and windows are closed,the volume of the flammable area will reach a maximum value,and the volume of the flammable area will reach a stable state when doors and windows are opened.The volume fraction of natural gas increases with the increasing of leak time,and it will reach a stable state of 4.55% when doors and windows are fully opened.The greater the opening degree of doors and windows,the shorter the time to reach a stable state,and the lower the volume fraction of the indoor natural gas at the stable state The position of windows during the change in a certain range does not affect the distribution of the volume fraction of the indoor natural gas,but can change the flow field.The installation location of gas leak alarm is optimized and simulated.
引文
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[2]侯庆民.天然气管道泄漏与天然气在大气中扩散的模拟研究(硕士学位论文)[D].哈尔滨:哈尔滨工业大学,2009:6-8.
[3]于义成.室内燃气泄漏扩散模拟及爆炸后果分析(硕士学位论文)[D].哈尔滨:哈尔滨工业大学,2015:1-4.
[4]张甫仁,张辉,庄春龙.室内燃气泄漏浓度场变化规律研究[J].建筑科学,2010,26(2):108-113.
[5]郝吉胆,马广大.大气污染控制工程[M].北京:高等教育出版社,1989:121.
[6]斯莱德D H.气象学与原子能[M].张永兴,译.北京:原子能出版社,1979:204-215.
[7]BLACKMORE D R,HERMAN M N,WOODWARD J L.Heavy gas dispersion model[J].Journal of Hazardous Matetials,1982,6(1/2):107-128.
[8]NAGAOSA R S.A new numerical formulation of gas leakage and spread into a residential space in terms of hazard analysis[J].Journal of Hazardous Materials,2014,271:266-274.
[9]YANG Zhao,LI Xihong,LAI Jianbo.Analysis on the diffusion hazards of dynamic leakage of gas pipeline[J].Reliability Engineering&System Safety,2007,92(1):47-53.
[10]朱柏龄,於孝春.储罐孔洞泄漏扩散危险区域分析[J].安全与环境学报,2009,16(3):104-108.
[11]于畅,田贯三.可燃气体室内泄漏扩散的研究[J].山东建筑工程学院学报,2006,21(3):243-247.
[12]薛海强.室内燃气泄漏扩散的数值模拟研究(硕士学位论文)[D].济南:山东建筑大学,2010:39-59.
[13]张丽.室内燃气泄漏扩散及燃烧爆炸的数值模拟(硕士学位论文)[D].太原:中北大学,2015:22-46.
[14]郭杨华.室内可燃气体泄漏扩散状态模拟及爆炸效应分析(硕士学位论文)[D].重庆:重庆大学,2011:3.
[15]王鹤超,吴明,程猛猛,等.室内燃气报警器的安装位置优化[J].辽宁石油化工大学学报,2014,34(6):42-46.