氢气掺混甲烷对湍流燃烧及NO生成排放的影响  

Effect of Hydrogen Enrichment of Methane on Turbulent Combustion and NO Emission

作　　者：谭宗洋 王丹阳 许建国 黄东欣 孟华[1] Tan Zongyang;Wang Danyang;Xu Jianguo;Huang Dongxin;Meng Hua(School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,China;Shanghai Institute of Space Propulsion,Shanghai 201112,China)

机构地区：[1]浙江大学航空航天学院,杭州310027 [2]上海空间推进研究所,上海201112

出　　处：《燃烧科学与技术》2024年第2期157-168,共12页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(12072321);国家科技重大专项基础研究项目(2017-Ⅲ-0005-0030).

摘　　要：采用非绝热火焰面-反应进度变量湍流燃烧模型和非绝热、非稳态NO计算预测模型,针对DLR双旋流燃烧室中的旋流喷射、混合和燃烧过程,开展了大涡模拟研究,获得了纯甲烷、体积分数30%和60%氢气掺混甲烷湍流燃烧的流场结构、火焰特性和NO分布的详细计算结果.分析表明,由于燃烧室中的流场主要由旋流空气所决定,掺氢燃烧的速度分布与纯甲烷燃烧没有明显区别.掺氢燃烧的外回流区温度降低,中心回流区温度升高,放热区域向上游移动,放热速率增大而放热区域减小.NO主要产生于内剪切层,外剪切层和高速剪切流的下游区域;在纯甲烷算例中,快速型和热力型机理所生成的NO数量相当,而掺氢燃烧中快速型机理所生成的NO减少、热力型机理所生成的NO则明显增多.In this paper,large eddy simulations were conducted to study the swirling injection,mixing,and combustion processes in a DLR dual-swirl combustor,using a non-adiabatic flamelet-progress variable turbulent combustion model and a non-adiabatic unsteady NO prediction model.The effects of 30%vol.and 60%vol.of hydrogen enrichment of methane on flowfields,flame characteristics,and NO variations were analyzed.Results indicate that the velocity distribution in the hydrogen-enriched combustion is almost the same as that in the pure methane case due to the fact that the flowfield is mainly controlled by swirling air injection.With hydrogen enrichment,however,the temperature decreases in the outer recirculation zone and increases in the central recirculation zone;the heat releasing zone moves upstream,with the heat releasing rate enhanced and the heat releasing zone reduced.NO is mainly generated in the inner shear layer,the outer shear layer,and the downstream region of the high-speed shear stream.In the pure methane combustion,the NO generated from the prompt and thermal mechanisms is almost the same in amount;in the hydrogen-enriched combustion,the NO generated from the prompt mechanism decreases in amount,while that from the thermal mechanism increases significantly.

关 键 词：大涡模拟 旋流喷射 湍流燃烧 氢气掺混 NO排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]