多孔介质燃烧波传播中的“超焓”特性  

Super-adiabatic characteristic of porous media combustion at different wave propagation direction

作　　者：凌忠钱[1,2] 周昊[2] 孔俊俊[2] 

机构地区：[1]中国计量学院计量测试工程学院,浙江杭州310018 [2]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2014年第4期660-665,共6页Journal of Zhejiang University：Engineering Science

摘　　要：在自行搭建的颗粒堆积多孔介质器中,以甲烷/空气为燃料,对多孔介质燃烧波传播过程中的"超焓"燃烧特性进行实验研究.在对比"超焓"与"非超焓"燃烧火焰温度的基础上,探讨不同当量比下燃烧波传播方向对"超焓"燃烧火焰温度的影响,对相应燃烧状态下的污染物排放特性进行比较.结果表明:随着当量比的升高,"超焓"燃烧状态下的火焰温度升高速率高于非"超焓"燃烧状态;燃烧波正向传播时,燃烧火焰温度超过绝热燃烧温度,出现"超焓"燃烧状态;燃烧波逆向传播时,燃烧火焰温度远低于绝热燃烧温度,出现"非超焓"燃烧状态;"超焓"状态下的CO排放体积分数低于"非超焓"燃烧,NOx排放体积分数相对较高.Super-adiabatic combustion in particle filled combustor was experimentally conducted by premixed methane/air mixtures under the different combustion wave propagation. The super adiabatic combustion temperatures were compared with those of the under-adiabatic combustion at different equivalence ratio, in addition to the combustion emissions at corresponding conditions. The influence of combustion wave propagation direction on flame temperature of super-adiabatic combustion was analyzed at the certain operation conditions. Results show that the rate of flame temperature increase at super- adiabatic combustion is much higher than that of the under-adiabatic combustion. The combustion temperature easily exceeds the adiabatic combustion temperature when the combustion wave propagates to the downstream, and the super adiabatic combustion appears. The combustion temperature is less than the adiabatic combustion temperature easily when the combustion wave propagates to the upstream, and the under-adiabatic combustion appears. The CO emission at supeFadiabatic combustion is lower than that of the unde-adiabatic combustion at the certain operating conditions, but the NO3 emission volume fraction is higher.

关 键 词：多孔介质 “超焓”燃烧 燃烧波 

分 类 号：TK124[动力工程及工程热物理—工程热物理]