CH_4/CO_2混合气体瞬时扩散特性的理论与仿真研究  

Theoretical and Simulative Study on Instantaneous Dispersion Characteristics of Methane and Carbon Dioxide Mixture Gas

作　　者：郑远攀[1,2] 钱慎一[1] 苏晓珂[1] 

机构地区：[1]郑州轻工业学院计算机与通信工程学院,郑州450002 [2]应急平台信息技术河南省工程实验室,郑州450002

出　　处：《防灾减灾工程学报》2013年第3期336-341,347,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(61163017);河南省教育厅科技攻关项目(2011B620003);郑州轻工业学院博士科研基金项目(2010BSJJ009)资助

摘　　要：甲烷(CH4)与二氧化碳(CO2)的混合气体具有潜在的爆燃和窒息危险性,掌握其瞬时扩散特性,不但可以为扩散模型的研发提供支持,也可以为相关事故的预防提供科学指导。采用扩散数据分析理论与计算流体力学技术相结合的方法,研究了甲烷和二氧化碳混合气体的瞬时扩散特性。仿真了甲烷和二氧化碳混合气体瞬时扩散的三维流场,并从云团分叉、逆风扩散和下风向扩散的非对称性方面论证了数据的可靠性。通过对流场数据的处理,得到了甲烷和二氧化碳混合气体的云团移动速度、浓度标准偏差和扩散系数等扩散特性分布律。研究表明,基于计算流体力学和气体扩散数据分析理论相结合的方法,可以对甲烷和二氧化碳混合气体的瞬时扩散特性进行准确的研究;近源区云团移动速率和扩散系数与下风向距离负相关。Gas mixture of methane and carbon dioxide has the potential deflagration and suffocation risk. Knowing characteristics of transient dispersion can not only support the development in dispersion moel, but also provide scientific guidance for prevention of accidents. This paper studies the transient dis persion characteristics of gas mixture composed of methane and carbon dioxide, using the technique based on the combination of computational fluid dynamics and analytical theory for dispersion data. Three dimensional flow field where transient dispersion happens is simulated. The reliability of simultive data is validated from three aspects, i.e. concentration bifurcation, upwind dispersion and asymmtry feature. Puff speeds, standard deviation of concentration, dispersion coefficient, etc are derived from original flow field data. Research suggests that dispersion characteristics can be precisely investigated by using the way based on the combination of CFD and analytical theory for dispersion data. Negative corrlations are found between near source characteristics, such as advection speed, dispersion coefficient, and downwind distance.

关 键 词：甲烷(CH4) 二氧化碳(CO2) 扩散特性 扩散系数 数值仿真 

分 类 号：TQ116.3[化学工程—无机化工]