地下综合管廊燃气泄漏数值模拟研究
|
摘要
基于规范对管廊独立舱的要求,利用Fluent软件分析综合管廊内燃气泄漏扩散,研究泄漏孔径、通风条件及泄漏速度对燃气扩散的影响。结果表明:燃气在泄漏时会出现浓度分层分布现象;无通风时,舱内燃气呈对称分布,大部分区间内燃气扩散距离与时间呈正相关关系;有通风时,受空气中涡流移动的影响,扩散明显偏移,舱室左侧顶部空间燃气质量分数几乎为0,而右侧则趋于定值,且其甲烷质量分数与泄漏时间满足Boltzmann函数关系;燃气泄漏距离和浓度随泄漏孔径、泄漏速度的增大而增大。
Based on the requirements of the specifications for independent compartment in the utility tunnel, Fluent was used to analyze the concentration distribution of leaked gas in the utility tunnel, and the effects of leakage aperture, ventilation conditions,and leak speed on gas diffusion in the cabin were researched. The results showed that there will be concentration stratification when the gas leaks;when ventilation is absent, the cabin gas is symmetrically distributed, and the gas diffusion distance is positively correlated with time in most intervals; when ventilation is present, affected by the movement of eddy currents in the air,diffusion becomes asymmetrical,the gas mass fraction on the left side of the compartment is almost zero, and that on the right side tends to a fixed value, the mass fraction of methane and the leakage time fit the Boltzmann function relation. The distance and concentration of gas leak will increase with the increase of leak aperture and leak speed.
Based on the requirements of the specifications for independent compartment in the utility tunnel, Fluent was used to analyze the concentration distribution of leaked gas in the utility tunnel, and the effects of leakage aperture, ventilation conditions,and leak speed on gas diffusion in the cabin were researched. The results showed that there will be concentration stratification when the gas leaks;when ventilation is absent, the cabin gas is symmetrically distributed, and the gas diffusion distance is positively correlated with time in most intervals; when ventilation is present, affected by the movement of eddy currents in the air,diffusion becomes asymmetrical,the gas mass fraction on the left side of the compartment is almost zero, and that on the right side tends to a fixed value, the mass fraction of methane and the leakage time fit the Boltzmann function relation. The distance and concentration of gas leak will increase with the increase of leak aperture and leak speed.
引文
[1]钱七虎,陈晓强.利用地下空间建设花园城市[J].地下空间,2003,23(3):302-305.
[2] MOHAN M, PANWAR T S, SINGH M P. Development of dense gas dispersion model for emergency preparedness[J]. Atmospheric Environment,1995,29(16):2075-2087.
[3] KIM H S,HWANG I J,KIM Y J.Characteristics of smoke concentration profiles with underground utility tunnel fire[J].??????????,2005,10(1):94-98.
[4]郭杨华.室内可燃气体泄漏扩散状态模拟及爆炸效应分析[D].重庆:重庆大学,2011.
[5] ZHAI M,MA G,WANG Z,et al. Numerical simulation of leakage and diffusion of indoor liquefied petroleum gas[J]. Journal of Liaoning Shihua University,2016,136(4):18-23.
[6]钱喜玲,闫小燕,赵江平.地下综合管廊天然气管道泄漏扩散模拟研究[J].中国安全生产科学技术,2017,(11):85-89.
[7]方自虎,王家远.共同沟内燃气扩散规律的数值分析[J].武汉大学学报(工学版),2009,42(2):215-218.
[8]方自虎,蔺宏,黄鹄,等.管廊内燃气泄漏扩散的模型试验与数值仿真[J].工程力学,2006,23(9):189-192.
[9] VEYNANTE D,VERVISCH L. Turbulent combustion modeling[J]. Progress in Energy&Combustion Science,2002,28(3):193-266.
[10] GB 50493-2009,石油化工可燃气体和有毒气体检测报警设计规范[S].
[2] MOHAN M, PANWAR T S, SINGH M P. Development of dense gas dispersion model for emergency preparedness[J]. Atmospheric Environment,1995,29(16):2075-2087.
[3] KIM H S,HWANG I J,KIM Y J.Characteristics of smoke concentration profiles with underground utility tunnel fire[J].??????????,2005,10(1):94-98.
[4]郭杨华.室内可燃气体泄漏扩散状态模拟及爆炸效应分析[D].重庆:重庆大学,2011.
[5] ZHAI M,MA G,WANG Z,et al. Numerical simulation of leakage and diffusion of indoor liquefied petroleum gas[J]. Journal of Liaoning Shihua University,2016,136(4):18-23.
[6]钱喜玲,闫小燕,赵江平.地下综合管廊天然气管道泄漏扩散模拟研究[J].中国安全生产科学技术,2017,(11):85-89.
[7]方自虎,王家远.共同沟内燃气扩散规律的数值分析[J].武汉大学学报(工学版),2009,42(2):215-218.
[8]方自虎,蔺宏,黄鹄,等.管廊内燃气泄漏扩散的模型试验与数值仿真[J].工程力学,2006,23(9):189-192.
[9] VEYNANTE D,VERVISCH L. Turbulent combustion modeling[J]. Progress in Energy&Combustion Science,2002,28(3):193-266.
[10] GB 50493-2009,石油化工可燃气体和有毒气体检测报警设计规范[S].