壁面厚度和材料对微通道内H_(2)/空气燃烧特性影响的数值模拟  

Numerical Investigation on the Effects of Wall Thickness and Material on H_(2)/Air Combustion Characteristics in Microchannels

作　　者：赵亮 安江波 Zhao Liang;An Jiangbo(Mechanical and Electrical Department,Navy Petty Officer Academy,Bengbu 233012,China)

机构地区：[1]海军士官学校机电系,蚌埠233012

出　　处：《燃烧科学与技术》2021年第2期193-200,共8页Journal of Combustion Science and Technology

摘　　要：通过数值计算对二维平板微燃烧器内H_(2)/空气的预混燃烧特性进行研究,讨论了壁面厚度和材料对火焰位置、外壁面温度、燃烧效率、热循环比和散热损失比的影响.结果表明:平板的热导率越高、平板厚度越大,火焰的稳定性就越好,吹熄极限和偏斜极限就越大;平板厚度越大、热导率越高,火焰位置越靠近燃烧器的上游,且平板外壁面温度分布更加均匀,燃烧效率和热循环比更高;燃烧器的散热损失比受到火焰温度的影响,并随着火焰温度的升高而降低,但是当进气速度达到偏斜极限时,燃烧效率和火焰温度开始下降,从而导致燃烧的散热损失比开始急剧下降.Numerical simulation was conducted to investigate the H_(2)/air combustion in a planar micro-combustor.The effects of wall thickness and material on flame position,outer wall temperature,combustion efficiency,heat recirculation ratio and heat loss ratio were examined.The following conclusions can be drawn:the flame stability is improved and higher combustion efficiency is achieved for micro-combustors with greater wall thickness and higher thermal conductivity;flames are stabilized at more up-stream locations under greater wall thickness and higher thermal conductivity;heat recirculation ratio increases with the increase in wall thickness and thermal conductivity,and heat loss ratio decreases with the increase in flame temperature.

关 键 词：微尺度燃烧 壁面厚度 热导率 吹熄极限 偏斜极限 

分 类 号：TK16[动力工程及工程热物理—热能工程]