微型瑞士卷燃烧器中甲烷/空气非预混火焰的实验和模拟  

Experimental Investigation and Numerical Analysis on the Flames of Non-Premixed Methane and Air in a Micro Swiss-roll Combustor

作　　者：李佳鑫 羊光耀 王世轩 范爱武[1] LI Jiaxin;YANG Guangyao;WANG Shixuan;FAN Aiwu(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 4430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《工程热物理学报》2024年第4期1179-1186,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.52176106)。

摘　　要：对微型瑞士卷燃烧器内甲烷/空气的非预混火焰进行实验研究和数值模拟。实验中总共观察到6种火焰模式,即:单个火焰、较对称的双子火焰、振荡火焰、明显不对称的双子火焰、熄火和吹熄。燃烧能够维持的最小名义当量比(ф)和甲烷入口流量(FM)分别为0.4和0.02 L·min^(-1)。数值模拟较好地复现了火焰结构,并且揭示了火焰结构在垂直方向的不对称性。通过对比有/无考虑重力的模拟结果,发现浮升力对流场和火焰结构有重要影响。综上所述,本研究加深了对微型瑞士卷燃烧器中非预混火焰特征的了解。Experimental and numerical study was performed to investigate non-premixed methane/air flames in a micro Swiss-roll combustor.Six flame patterns were observed in the experiment,namely,single flame,relatively symmetrical twin flames,pulsating flame,obviously asymmetric twin flames,extinction and blowout.The lower limits of nominal equivalence ratio(ф)and methane flow rate(F_M)required to sustain combustion were found to be 0.4 and 0.02 L·min^(-1),respectively.Flame structures were well reproduced through numerical simulation,and the vertical asymmetry of the flame structure was revealed as well.The comparison between the numerical results obtained by considering the gravity or not,demonstrated that the buoyancy effect played an important role in the flow field and flame structure.In summary,the present study provides a deeper insight into non-premixed flame characteristics in micro Swiss-roll combustors.

关 键 词：微尺度燃烧 瑞士卷燃烧器 非预混燃烧 火焰结构 浮升力效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]