空气槽对微型双通道螺旋型过量焓燃烧器工作特性的影响  

Effects of Air Groove on Combustion Characteristics of a Micro Swiss-roll Combustor

作　　者：李军伟[1] 钟北京[2] 王宁飞[1] 魏志军[1] 

机构地区：[1]北京理工大学宇航学院,北京市海淀区100081 [2]清华大学航天航空学院,北京市海淀区100084

出　　处：《中国电机工程学报》2010年第2期40-45,共6页Proceedings of the CSEE

基　　金：教育部博士点新教师基金项目(200800071020);北京理工大学优秀青年教授计划(2008Y0210)

摘　　要：为了解空气槽对平板微型双通道螺旋型过量焓燃烧器(Swiss-roll燃烧器)工作特性的影响,采用甲烷/空气预混气,在带有空气槽和没有空气槽的平板Swiss-roll燃烧器中进行燃烧实验。实验结果表明:空气槽有助于扩展微燃烧器的可燃极限,使燃烧器在更大的空气过量系数和更小的甲烷流量下工作,同时增加了燃烧器外壁的温度梯度。另外,对带有空气槽的微燃烧器进行了数值模拟。数值结果表明,高温燃气对未燃混合物有很强的加热作用,一方面使预混火焰面发生倾斜,另一方面使预混火焰在微燃烧器内部的位置随着流速、空气过量系数、外界散热的变化而变化。To understand effects of air groove on working characteristics of a micro Swiss-roll combustor, combustion of premixed CH4/air was conducted in two micro Swiss-roll combustors, one with an air groove and the other without an air groove. The results showed that the air groove can enlarge the flammable limits of the combustors, and make the combustor stably work at a larger excess air coefficient and a smaller methane flow rate. Meanwhile, it increases radial surface temperature gradient on outer wall of the combustor. Additionally, the combustor with an air groove was numerically simulated. The numerical results indicated that high-temperature combustion products has a strong role in heating incoming premixed mixtures. On one hand, it makes premixed flame surface tilt across inlet channel; on the other hand, it changes flame position in a micro-combustor with velocity, excess air coefficient and heat loss to the surroundings.

关 键 词：微小燃烧室 过量焓燃烧 预混燃烧 燃烧特性 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]