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    초록·키워드

    A cylindrical constant volume combustion chamber was used to investigate the combustion characteristics of stratified methane-air mixture under several initial charge conditions in the author's previous reports. The results showed that the improvement of thermal efficiency and reduction of heat loss was realized simultaneously by using 2-stage injection method.
    This paper deals with the reason why the stratified combustion has showed better combustion rate through the measurement and analysis of chemiluminescence of CH and C₂ radicals. An optic libel' bundle is used to measure the local emission of CH and C₂ radicals to map the relationship between the excess air ratio and local radical intensity ratio in the combustion vessel at 5 ㎜ apart form the geometric center. The results show that there exist a relationship between the intensity ratio and the air-fuel ratio. It is revealed that the improvement of combustion rate in a lean-stratified mixture is realized through the 2-stage injection method.

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      UCI(KEPA) : I410-ECN-0101-2009-556-014267930