当量比对脉动燃烧NO_x生成机理的影响  

NO_x Formation Mechanism of Pulse Combustion Under Different Equivalence Ratios

作　　者：邓凯[1] 沈忠良[1] 王明晓[1] 钟英杰[1] 

机构地区：[1]浙江工业大学能源与动力工程研究所脉动技术工程研究中心,杭州310014

出　　处：《燃烧科学与技术》2014年第5期428-432,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51106139)

摘　　要：构建了描述声场部分预混火焰耦合的脉动燃烧模型,模拟了脉动声场作用下当量比φ对NOx生成特性的影响,模拟结果与实验结果吻合.通过对火焰区域温度、停留时间、CH和OH质量分数的分析发现,φ≤2.5时,以热力型NOx为主,φ=2.5时达到极大值.2.5≤φ≤4时,热力型NOx逐渐减小,在φ=4附近出现了NOx生成的极小值点,其原因在于火焰高温区域和停留时间减小,与火焰结构变化有关.φ>4时,以瞬态型NOx为主,随当量比增大瞬态型NOx增加,其原因与碳烟辐射的增加有关.The model of pulse combustion which describes acoustic effects on partially premixed flame was constructed. The NOx formation of pulse combustion under different equivalence ratios（Ф） was simulated and the results were in good agreement with the experimental results. Based on the results of flame temperature,residence time,mass fraction of CH and OH,when Ф≤2.5,thermal NOx dominates NOx formation,and Ф（NOx） reaches its maximum value when Ф=2.5;then NOx began to decrease and reached its minimum value when Ф=4 thanks to the decrease of high temperature region and residual time;when Ф〉4,transient NOx dominates NOx formation,and with the equivalence ratio increasing,the transient NOx increases thanks to the increase of flame radiation.

关 键 词：当量比 脉动燃烧 NOx 生成机理 数值研究 

分 类 号：TK09[动力工程及工程热物理]