CAJ | 학술논문

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．
구건료묘술성장부분예혼화염우합적맥동연소모형，모의료맥동성장작용하당량비φ대NOx생성특성적영향，모의결과여실험결과문합．통과대화염구역온도、정류시간、CH화OH질량분수적분석발현，φ≤2.5시，이열력형 NOx위주，φ=2.5시체도겁대치．2.5≤φ≤4시，열력형 NOx축점감소，재φ=4부근출현료 NOx생성적겁소치점，기원인재우화염고온구역화정류시간감소，여화염결구변화유관．φ＞4시，이순태형 NOx위주，수당량비증대순태형NOx증가，기원인여탄연복사적증가유관．
The model of pulse combustion which describes acoustic effects on partially premixed flame was con-structed. The NOx formation of pulse combustion under different equivalence ratios(φ) 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,whenφ≤2.5,thermal NOx dominates NOx formation,and?(NOx) reaches its maxi-mum value whenφ=2.5;then NOx began to decrease and reached its minimum value whenφ=4 thanks to the de-crease of high temperature region and residual time;whenφ>4,transient NOx dominates NOx formation,and with the equivalence ratio increasing,the transient NOx increases thanks to the increase of flame radiation.