突扩管道中H2/Air预混火焰传播特性的数值模拟  

Numerical simulation on flame propagation characteristics of premixed H2/Air in sudden expansion ducts

作　　者：张英[1] 宋舆涵 蒋帅[2] 李云涛 申世飞[4] 陈月[1] ZHANG Ying;SONG Yuhan;JIANG Shuai;LI Yuntao;SHEN Shifei;CHEN Yue(Department of Safety Science and Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;Chinese Ship Design and Research Center,Wuhan Hubei 430064,China;Department of Safety Engineering,China University of Petroleum,Beijing 102249,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China)

机构地区：[1]武汉理工大学安全科学与工程系,湖北武汉430070 [2]中国舰船研究设计中心,湖北武汉430064 [3]中国石油大学安全工程系,北京102249 [4]清华大学工程物理系,北京100084

出　　处：《中国安全科学学报》2019年第7期33-38,共6页China Safety Science Journal

基　　金：国家重点研发项目(2016YFC0802807);国家自然科学基金资助(51404178,51706164)

摘　　要：为探究氢气(H2)/空气(Air)预混气体爆炸事故中突扩型管道对火焰结构形成与发展造成的影响,基于k-ε湍流模型和β-flame火焰增厚模型,采用Flacs软件开展不同突扩角度β对突扩管道内火焰传播特性(速度和超压等)影响的数值模拟研究。结果表明:不同β的管道内H2/Air预混火焰传播过程都经历熄灭与再次点燃阶段;β对管道内火焰传播距离有明显影响,随着β角度减小,火焰极限传播距离明显降低;β越小,管道内斜压作用对涡旋抑制效果越明显,进而越会抑制燃料组分的输运和火焰的继续传播。To explore the characteristics of premixed Hydrogen/Air flame propagation in sudden expansion ducts,the flow structure,flame shape,flame speed and overpressure of flame through the ducts with various expansion anglesβwere numerically investigated by Flacs based on the k-εmodel and theβ-flame thickening model.Results shows that the premixed Hydrogen/Air flame undergoes stages of extinction and re-ignition in the sudden expansion ducts under various angles ofβ.The flame propagation distance in the ducts increased obviously with the angleβ.Baroclinic effect can inhibit the intensity of the vortex in the flow field,and hence weaken the forward transport of fuel.This inhibit effects decrease with the expansion angleβ.

关 键 词：突扩型管道 H2火焰 火焰传播 斜压作用 涡旋 

分 类 号：X928.7[环境科学与工程—安全科学]