厂区天然气泄漏扩散的数值模拟研究
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摘要
根据危险性气体空间泄漏扩散的特点,对厂区天然气等危险性轻质气体泄漏扩散运动进行了数值模拟,着重研究了大气风向风速、泄漏射流方向和泄漏时间对危险性轻质气体(天然气)空间泄漏扩散浓度场和危险性区域的影响.其中大气主导风的风速对气体扩散浓度和扩散危险性区域有很大的影响,如等值线图模拟的条件下,在x方向上,风速v=0.5 m.s-1比v=5.0 m.s-1条件下危险性区域大155 m.
With an eye to the characteristic of deleterious gas leak and diffusion,we simulate the hazardous light gas(natural gas) leak and diffusion in plant area.The effects of wind speed,windward,sustaining time,orientation of leakage source on concentration field and fatalness region of natural gas leak and diffusion is studied.It shows that effect of wind speed on concentration field and fatalness region are notable,in the condition of the isoline chart,the discrepancy of fatalness region is 155m between v=0.5 m·s-1 and v=5.0 m·s-1 on x direction.
With an eye to the characteristic of deleterious gas leak and diffusion,we simulate the hazardous light gas(natural gas) leak and diffusion in plant area.The effects of wind speed,windward,sustaining time,orientation of leakage source on concentration field and fatalness region of natural gas leak and diffusion is studied.It shows that effect of wind speed on concentration field and fatalness region are notable,in the condition of the isoline chart,the discrepancy of fatalness region is 155m between v=0.5 m·s-1 and v=5.0 m·s-1 on x direction.
引文
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[2]Subhashini Ghorai,K D P Nigam.CFD modeling of flowprofiles and interfacial phenomena in two-phase flowin pipes[J].Chemical Engineering and Processing,2006,45:55-65.
[3]孟志鹏,王淑兰,丁信伟.可爆性气体泄漏扩散时均湍流场的数值模拟[J].安全与环境学报,2003,3(3):25-28.MENG Zhi-peng,WANG Shu-lan,DING Xin-wei.Numerical simulation of homo-turbulent field of explosible gas dispersion[J].Journal of Safety and Environment,2003,3(3):25-28.
[4]Black more D R,Herman MN,Woodward J L.Heavy gas dispersion models[J].Journal of Hazardous Materials,1982,6:107-128.
[5]赵振东,余世舟,钟江荣.地震次生毒气泄漏与扩散的数值模拟与动态仿真[J].地震工程与工程振动,2002,22(5):137-142.ZHAO Zhen-dong,YU Shi-zhou,ZHONG Jiang-rong.Numerical simulation and dynamic emulation of poisonous gas leakageand diffusion in destructive earthquake[J].Earthquake Engineering and Engineering Vibration,2002,22(5):137-142.
[6]梁栋,张海英.建筑环境中有害气体扩散及分布的分析[J].广州大学学报,2004,3(4):338-341.LIANG Dong,ZHANG Hai-ying.Numerical simulation of the poisonous gas diffusion process around the buildings[J].2004,3(4):338-341.
[7]Patankar S.V.Numerical heat transfer and fluid flow[M].Hemisphere Publishing Corporation and McGraw-Hill BookCompany,1980.
[8]金忠青.N-S方程的数值解和紊流模型[M].南京:河海大学出版社,1989.JIN Zhong-qing.Numeric solution of N-S equation and turbulent model[M].Nanjing:Hehai University Press,1989.
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