突扩管道中H2/Air预混火焰传播特性的数值模拟

doi:10.16265/j.cnki.issn1003-3033.2019.07.006

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (7): 33-38.doi: 10.16265/j.cnki.issn1003-3033.2019.07.006

突扩管道中H₂/Air预混火焰传播特性的数值模拟

张英¹ 副教授, 宋舆涵¹, 蒋帅², 李云涛³, 申世飞⁴ 教授, 陈月^**1

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

收稿日期:2019-04-25 修回日期:2019-06-04 出版日期:2019-07-28
作者简介:张英 (1985—),男,湖北襄阳人,博士,副教授,主要从事火灾防控、新能源热安全技术等方面的研究。E-mail:yzhang@whut.edu.cn。
基金资助:
国家重点研发项目(2016YFC0802807);国家自然科学基金资助(51404178, 51706164)。

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

ZHANG Ying¹, SONG Yuhan¹, JIANG Shuai², LI Yuntao³, SHEN Shifei⁴, CHEN Yue¹

1 Department of Safety Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China;
2 Chinese Ship Design and Research Center,Wuhan Hubei 430064, China;
3 Department of Safety Engineering, China University of Petroleum, Beijing 102249, China;
4 Department of Engineering Physics, Tsinghua University,Beijing 100084, China

Received:2019-04-25 Revised:2019-06-04 Published:2019-07-28

摘要/Abstract

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。

关键词: 突扩型管道, H₂火焰, 火焰传播, 斜压作用, 涡旋

Abstract: 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 angles β were numerically investigated by Flacs based on the k-ε model and the β-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 of β.The flame propagation distance in the ducts increased obviously with the angle β.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 angle β.

Key words: sudden expansion duct, H₂ flame, flame propagation, baroclinic effect, vortex

中图分类号:

X928.7

张英, 宋舆涵, 蒋帅, 李云涛, 申世飞, 陈月. 突扩管道中H₂/Air预混火焰传播特性的数值模拟[J]. 中国安全科学学报, 2019, 29(7): 33-38.

ZHANG Ying, SONG Yuhan, JIANG Shuai, LI Yuntao, SHEN Shifei, CHEN Yue. Numerical simulation on flame propagation characteristics of premixed H₂/Air in sudden expansion ducts[J]. China Safety Science Journal, 2019, 29(7): 33-38.

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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

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