甲烷及掺氢燃气吹熄极限的大涡模拟研究  

Large Eddy Simulation on Blow-Off Limit of Methane and Hydrogen-Mixed Gas

作　　者：周希瑞 王平 曾海翔 张洋 PRASHANT Shrotriya ANTONIO Ferrante 祁浩天 ZHOU Xirui;WANG Ping;ZENG Haixiang;ZHANG Yang;PRASHANT Shrotriya;ANTONIO Ferrante;QI Haotian(Institute for Energy Research,Jiangsu University,Zhenjiang 212013,Jiangsu,China;School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;Centro Combustione Ambiente,Bali 70023,Italy)

机构地区：[1]江苏大学能源研究院,江苏镇江212013 [2]江苏大学能源与动力工程学院,江苏镇江212013 [3]燃烧与环境中心,巴里70023,意大利

出　　处：《上海交通大学学报》2022年第5期635-647,共13页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(91741117,51576092)。

摘　　要：利用大涡模拟法计算研究甲烷和掺氢燃气在悉尼非均匀入流射流燃烧器上的吹熄极限.利用GRI 3.0详细反应机理和28步、19步简化反应机理对比计算不同掺氢燃气状态下的层流预混火焰,证明了19步简化反应机理具有良好性能.利用动态增厚火焰燃烧模型结合19步反应机理,计算研究以掺氢燃气(体积比V(H_(2))∶V(CH_(4))∶V(CO)∶V(CO_(2))=0.2∶0.2∶0.27∶0.33)为燃料的悉尼部分预混中心射流火焰.计算得到在FA和FJ布局下,掺氢燃气的火焰吹熄极限速度分别为90 m/s和109 m/s,甲烷的火焰吹熄极限速度分别为74 m/s和128 m/s,分析发现吹熄极限的差异与不同布局下燃气与空气混合不均匀程度相关.研究表明,优化燃气与空气的进气布局和掺混过程可以提升燃烧稳定性.The blow-off limits of methane and hydrogen-mixed gas on the Sydney inhomogeneous inflow jet burner were calculated and studied by large eddy simulation. The GRI 3.0 detailed reaction mechanism, 28-step and 19-step methane simplified reaction mechanisms were used to calculate the laminar premixed flames under the condition of different hydrogen-mixed fuel gases, which demonstrates the good performance of the 19-step simplified mechanism. A dynamic thickening flame combustion model was combined with the 19-step reaction mechanism to compute the Sydney partially premixed jet flame burner with a hydrogen-mixed gas(the volume ratio of V(H_(2))∶V(CH_(4))∶V(CO)∶V(CO_(2))=0.2∶0.2∶0.27∶0.33). The blow-off limits in FA and FJ layouts of hydrogen-mixed gas are 90 m/s and 109 m/s, while for pure methane flames are 74 m/s and 128 m/s, respectively. The difference of blow-off limits between the two fuels is related to the inhomogeneity of fuel and air mixing in different layouts. This study shows that the combustion stability can be improved by optimizing the inlet layout and mixing process of fuel gas and air.

关 键 词：部分预混火焰 吹熄极限 掺氢燃气 增厚火焰模型 大涡模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]