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Characteristics of Combustion Radical in CNG Direct Injection Vessel  

최승환 (부산대학교 기계공학과)
조승완 (부산대학교 기계공학과)
이석영 (부산대학교 기계공학과)
정동수 (한국기계연구원)
전충환 (부산대학교 기계공학과)
장영준 (부산대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.5, 2004 , pp. 58-65 More about this Journal
Abstract
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 C $H^{*}$ and $C_{2}$$^{*}$ radicals. An optic fiber bundle is used to measure the local emission of C $H^{*}$ and $C_{2}$$^{*}$ radicals to map the relationship between the excess air ratio and local radical intensity ratio in the combustion vessel at 5 mm 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. method.
Keywords
Constant-volume combustion vessel; Local excess air ratio; Methane-air mixture; Combustion radical; Chemiluminescence;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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